Ste hs eA ee Teo hes tas ee weet WA eco p ae FEM ARAR S REE De wt hie B Ae « Or Nien a sae : pee re as arb 2 / 5 D YOTEVOY Dk achyder; IL Y, “bi Rig te ee. oe x “\ THE FAUNA OF BRITISH INDIA, ye INCLUDING CEYLON AND BURMA. PUBLISHED UNDER THE AUTHORITY OF THE SECRETARY OF Srare ror Inpra 1n Covncit. EDITED BY A. BH, SHIPLEY, M.A., HON. D.Sc., F.R.S. ASSISTED BY GUY A. K. MARSHALL, F.Z.S., F.E.S. DIPTERA NEMATOCERA (excLupIng CHIRONOMID anp CULICIDA®).. suo BY E. BRUNETTI. LONDON: TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. CALCUTTA : BOMBAY: THACKER, SPINK & CO. THACKER & CO., LIMITED. BERLIN : R. FRIEDLANDER & SOHN, 11 CARLSTRASSE. November, 1912. \e 230984 ( \ ALEKE FLAMMAM. ¢ : °, PRINTED BY TAYLOR AND FRANCIS, RED LION COURT, FLEET STREET. CONTENTS. AutTuHor’s PREFACE (QOSS RSo pine PI a inet Skah see heh) ay we Systematic INDEX ERRATA AND ADDENDA. 1) ExterRNnan ANATOMY OF Any 2: . . . A. Terminology The Head Bae St Phe lee het, Raab aaa The Thorax Oe LL geet: Salient deh ten een The Abdomen The Legs The Wings . B. Descriptive The Head The Thorax : SP a ein Lee Be iRrewAlboomene 4 ri cael) 421 ain ht eer coed: The Legs. The Wings 2. INTERNAL ANATOMY 3. Tur Earty SraGeEs oF DIPTERA. The Larva . The Pupa EV ach on! on Wr She er “Mave 18 omic vy hie) Shee ey aes Uehcriimer 4. On THE COLLECTION OF DIPTERA ... . 5. Tur MountTIne AND PRESERVATION OF DIPTERA 6. STANDARD WoRKS FOR STUDENTS. . 7. EstrIMATED NUMBER OF KNOWN SPECIES. . 8. THE CLASSIFICATION OF THE DIPTERA 9, THE SUBORDERS OF THE DipreRa PRI a COROT DUO EEMEM ss Ge mt) Nematocera Brachycera Cyclorrhapha 1D an? CS Oo NN iv CONTEN'S, TABLE OF FAMILIES IN NEMATOCEFRA . ser MMGCOLOINULNeS Geen. tn eA Pep AAOCEMA Gs 4 i So ee gl Poca ee Bibionide PARR fo, Gh - yeidg ge Pee nee Simuliide eR WEE eer 65. bey PESCHOO aes (tif Sse Tote: coed ee toe Og Divide a re es es 2) ae Be ie ENE | Sch e508 Wg a) en ee EPO 8 2 Ibe ahs Pay ela eee TABLE OF SUBFAMILIES OF MYCETOPHILIDA . WMG CHOCEFING@ id is) 2 Ga keen ee Ceroplatine Sciophiline Mycetophiline Sciarine . TABLE OF SUBFAMILIES OF BIBIONID” Bibionine Sia hat a, Po ae ee a ee CU POD Se has ee een Demers, TABLE OF SUBFAMILIES OF PSYCHODIDH .. . Phlebotomine Psychodine. TABLE OF SUBFAMILIES OF TIPULID® Ptychopterine . . . eee DUES Bet eer an a TiN NODLING Veag- ae a ee Pee TABLE OF SECTIONS OF TIPULINZ CHENOPROFIY oadlas Rael. i ES en <5 oS PUG 5... Cond aes ab MES CS Ios, Te ae ae Dolichopezmt . . .. TABLE OF SEecTIoONS OF LIMNOBIINA Cylindrotomint Limnobiini . cc ee UO. DE re? fe ie eee ge A, Ss Evriopterint Amalopini Limnophilini ANTSOMEFU ies, ko Dec ee On LABELLING DIPTERA FOR THE CABINET PAG PEACE Hy CUACE UNFIT) IEe Koo men eee. Se ee TeXPLANATION OF PLATES. Oo VO DOT 3538 AUTHOR'S PREFACE. Tue present volume, which deals with the Indian Nemarto- cera,* except the Curronomip# and Cunicip4, is the first one of the “ Fauna of British India” series devoted to the Diptera, although this is an order of insects abundantly represented in every region of the globe, excepting only extreme arctic lati- tudes and torrid deserts, and even in these latter parts more species are to be found than might generally be supposed. Yet the study of Oriental Diptera is quite in its infancy, less than 3000 species being known from the whole region as: late as 1896. Since that date certain groups have been revised, but the material thus treated has, in nearly every case (except the mosquitos), been drawn from but a limited section of that zoological region. The Curicip™ is the only family that has been extensively studied from any considerable number of localities within the limits of the ‘ Fauna” series. It would not be unreasonable to estimate the existing species of the more conspicuous families (such as TaBANIDA, Bompytiip&, Asitipa, Syrewip#, and the more showy Muscip#) at not less than double the number of those already recorded ; whilst in the more obscurely coloured groups (as, for example, the Cuironomip&, MycrerorHiLip#, Emrip%, and the more sombre Muscrpa), the existing species may outnumber the known ones by many times. The Muscipa are mainly obscurely coloured or else the species are very difficult to differentiate, which probably accounts for the general neglect of this family. Yet the family contains about a third of all known Diptera. * [The author has used the word Nemocera throughout his manu- script, but it has seemed advisable to adopt the more correct form, NEMATOCERA, Which is now more generally used by dipterologists. —Ep. | val AUTHOR’S PREFACE. Many new species in the families at present treated of will with certainty be discovered, but it seems reasonable to assume that for some little time to come the wants of the Indian student in the groups monographed herein will be tolerably well met in these pages. The bulk of the present material forms an integral part of the Indian Museum collection, and it is directiy due to my familiarity with that collection that this volume has been rendered possible. My thanks are therefore freely tendered to Dr. Annandale, the indefatigable Superintendent of that Institution, and to his co-directors, since it has been at his instigation that I have obtained the necessary knowledge. My heartfelt thanks are also due to the following gentlemen who have most kindly suppled me with much valuable information respecting the types of TipuLip# that are con- tained in European Museums *:—Dr. A. Handlirsch (Vienna Museum); Prof. R. Gestro (Genoa Museum); Dr. J. C. de Meijere (Amsterdam Museum); Mr. Ritsema (Leyden Museum); Mr. C. Hill (British Museum); Dr. A. Brauer (Berlin Museum); Mr. Lundbeck (Copenhagen Museum) ; and Mr. Bedot (Geneva Museum). To the Directors of the Pusa Agricultural Research Institute thanks are also due for the loan of specimens for examination, through the kindness of Mr. F. M. Howlett, and the gift of a certain number of cotypes for my own collection; also to Mr. A. D. Imms, of the Muir Central College, Allahabad, for the loan of specimens which, although not numerous, comprised a number of new species. Special thanks are due to Mr. E. E. Green for his untiring energy in collecting the Diptera of Ceylon and presenting a number of types of new species to the Indian Museum (as Mr. Howlett * This information has already been included in a previous paper of mine (‘ Revision of the Oriental Tipulide,”’ Records of the Indian Museum, vi, pp. 231-314, 1911), but that paper was practically a basis for the present more exhaustive work. AUTHOR’S PREFACE, vii and Mr. Imms have also done), thus affording me the great advantage of having practically all the known Indian species before me simultaneously whilst describing. A large proportion of the new species have been collected by Dr. Annandale and Mr. Green, and a considerable number by Mr. C. Paiva of the Indian Museum. Owing to this fact the types of six-sevenths of the recorded species have been under my personal examination, for out of over four hundred species dealt with in this volume only about sixty have been described by other authors. The previously recorded species have been identified by me from descriptions only, except in a few instances in which my identifications have been corroborated by comparison with types. As regards the use of the words “type,” ‘““cotype,” and so on, there seems no necessity to discuss the various terms with their exact meanings here, in view of the different opinions of zoologists on this subject; and more especially as the simple terms “type’’ and “cotype”’ fulfil all the requirements in this work. Yet a few remarks to avoid ambiguity to the student, and that he may at least under- stand the senses in which the terms are understood by me, may be pardonable. Personally, when describing a new species, of which several specimens of each sex are present. I select one male and one female which, (1) embody the whole or the buik of the characters of the species, (2) are in as perfect condition as possible, and (3) from their mounting allow the best view of all parts of the body. These two specimens are termed the type male and type female, and whenever both sexes are present, the type maleis always the type of the species. Alli other specimens present before me at the time of describing are termed cotypes. When only one sex is present, the type specimen may be male or female. In the event of two species being described under the impression that the specimens represented the two sexes of a single species, the name of the species must invariably be ay Vill AUTHOR’S PREFACE. retained for the male, which takes precedence of the female, and a new name would have to be found for the latter. It has always been my endeavour to describe the species and not merely the type specimens, as is too often done. In proposing the term “ neotype” (or “new ” type) it may be that an original suggestion is being made, as I am not aware that it has previously been proposed. It is intended for use when the original type is lost and a new one is set up, either from amongst the original cotypes or otherwise ; and selected either by the author of the species or by a competent specialist. If selected from cotypes or chosen by the author of the species from other specimens, a neotype should practically be of equal value with the original type; but a neotype set up by any other person than the author might by some entomologists be ranked as of rather less value. The only occasion when it has been necessary in this work to employ the word is in the case of Simulium indicum, Becher, where I have selected one of the original specimens from which the description was drawn up, to represent the type of the species. There still remains a limited residuum of small, obscure, or mutilated specimens of Tiputip® and MycrrorHiLipa, which from their uncertain specific distinctness or un- satisfactory condition have not been referred to in these pages. These may be worked out later on with further material. - In conclusion it is only necessary to say that every care has been given to make the present work as complete as possible ; and if I am honoured with the preparation of any further volumes, I would express the hope that they may be written in Europe, since, to any one possessed of nerves, the inconveniences and irritations of India render scientific work exceedingly difficult. EK. BRUNETTI. Calcutta, December 1911. GL@s:5 A kh Y¥. Acalyptrata.—One of the two great subdivisions of the Muscrpx, comprising those species in which the squame are of equal size or nearly so, or absent. They embrace twenty or more groups which are taxo- nomically subfamilies only, but on account, of their magnitude are by some authors regarded as families. See Calyptrata. Acephala or acephalous larve.—Those in which there is no differentiated head ; as opposed to the Eucupnana. Acetabulum.—The minute joint attaching the coxa to the body. Acroptera.—Brauer’s third division of the OrrHorruarna Bracnycura, con- sisting only of the Loncnorreripx. Considered by him a super- family. Aculeus.—A term used in Hymenoptera to denote the sting of such insects as bees and wasps, but since no Diptera are aculeate, the term has been employed by certain of the older authors to define part of the genital organs. See Stile. Adminiculum.—Westhoff’s name for the variously structured guard of the penis in TrruniD™®. Aerial dancing.—Applied to the habit of many species of Diptera and other orders of forming small clusters in the air, usually beneath the lower boughs of trees or over streains, and flying mainly up and down with considerable swiftness. This habit is somewhat different from that known as “hovering” (g. v.), and, at least as regards Diptera, seems to be chiefly confined to the males; moreover, they appear most addicted tu the practice towards sunset. Alula.—The anal lobe of the wing proper, and not to be confounded with the squame, or tegule. Many authors (including myself in my earlier notes) have erroneously used the term to denote the squame (p. 15). Ambient vein.—The very fine vein running round the hind margin of the wing from the end of the costa to the base. Amphipneustic.—Larve with spiracles on the first and last segments only. Anal cell,—-The cell behind or posterior to the 5th longitudinal vein when that is present (p. 14). Anal vein.—The 6th longitudinal vein, having theoretically in front of it the anal cell, and posterior to it the axillary cell. Antennal grooves or fovee.—A longitudinal groove or pair of grooves in the iniddle of the frons, for the reception of the antenne, bounded on each side by the facial ridge. Anterior legs.—The four front legs taken together, the first pair only being termed the fore or front legs, b x GLOSSARY, Antigeny.—A term sometimes useil to denote sexual dimorphism. ee \ See Sguame. . Apex, apical.—The part of an organ, segment, etc., which is most distant from an imaginary point lying between the thorax and abdomen of an insect, such as the tip of the abdomen, the last joint of the leg, antenna or palpus. Opposed to base, basal, Arista.—The terminal bristle, sometimes very long, on the last joint of the antenna, Occasionally it is two-jointed, but this is perceptible ouly under high magnification. It is practically absent in the Orrnor- ruArHA, though quite general in the Cycrorrmarna. In only one very small family (the Orrnnerniiipm) of the NemArocnra is there any approach to it; the antennal flagellum in this group being aristiform. The arista may be pectinate (7. e. with strong hairs, few in number, on its upper and lower sides), pubescent, or plumose (when the hairs are long and placed closely together, forming so to speak a large feather). In nearly all such cases the hairs are more abundant on the upper- side. In many groups it is quite bare. Axillary cell——See pp. 8 and 15, Avillary vein.—The 7th longitudinal vein, or when the venation is reduced it is applied to the vein behind the anal vein, but in many cases it is absent. Barba, ov beard.—Practically absent in the Numatocera. The long hair on the lower side of the face and head, conspicuous in the Asinipm; often joined without interruption to the mystax * or the hair on the cheeks. The older authors used the term mystax or barba for all the hair on the head below the level of the antenne. Base, basal.—Applied to that portion of an organ, segment, ete. which lies nearest to an imaginary point between the thorax and the abdomen of an insect ; as opposed to distal, apical, and apex. Bombylimorpha:—A. superfamily used by Brauer and Bezzi for the Cyrrrinn (Acroceripz) and Nemesrrinip& together. Brachycephalous.—Having the head wider than it is long. Callus, calli.—More or less distinct swellings on various parts of the body, generally on the thorax; in some families (especially in TaBanip®) on the frons or vertex. (See p. 5.) Calypter, calyptron,—See Squane ; also p. 16, note. Calyptrata.—A division of the great family Muscip™, embracing about. half the known species, including all those in which the squame are large, easily visible, and distinctly different in size; as opposed to the ACALYPTRATA, in which they are very small, practically equal in size (the upper and lower scale), or absent. The Catyprrara comprise the Tacninin (including the Drexrnna and SarcoruaAgine), Muscixe and Antnomyinm®. See Acalyptrata. Cells.—For full description, see pp. 8 and 13. * Literally, moustache. GLOSSARY, Central vesicle ov vesicula centralis,—Vhe large bulbous basal portion of the penis in Trevi», Cephalic.—Appertaining to the head. Chetotary.—The arrangement of the prominent spines and strong bristles present on various parts of the body in many groups of Diptera. They are very valuable classificatory characters, and are named in accord- ance with the parts of the body on which they are placed, cephalic, thoracic, abdominal, and so on. ‘Those on the sides of the thorax are known as pleural bristles, whilst most of the well-defined and constant ones on other parts of the body have their special names. As, however, none of the Numarocera possess bristles of chstotactic magnitude it is unnecessary to describe them in full here. They reach their maximum probably both in size and importance in the Asinip& and Muscipz. Cheeks, or gene.—The sides of the lower part of the head below the eyes and on each side of the mouth. Chitine—The substance of which the hard parts of the outer covering of insects is composed. Cinereous.—A light grey colour, but not so pale as ash-grey. Ridgway * illustrates it as too dark, to my thinking; his No. 6 “ orey” being more my own opinion of the term. Claws.—See Ungues. Clypeus.—This is probably present only in those Diptera with highly developed mouth-parts. It is an upper transverse piece, and most obvious in such groups as the TaBanip®. Coarctate.—A term used to designate those pups of insects in which the future parts are unrecognizable from the exterior surface. Cocoon.—The outer covering of silk, or similar substance, formed by the larvee of many insects, in which they pass the pupa state. Collare.—Osten Sacken’s term for the disc-shaped prothorax in many TirvLip». Collum.—The neck. Costa.—Technically, the entire marginal vein of the wing from base to base, but usually employed im Diptera to denote the anterior margin only from the base to the extreme tip. In some genera this vein, the costal, actually terminates somewhere near the wing-tip, its place then being taken by the ambient vein for the remainder of the marginal distance. Costal cell.—The cell immediately below the costa or costal vein. See pp. 8 and 13. Cotyloid cavity.—The opening in the thorax of insects which receives the head of the first joint of the leg, namely, the acetabulum, or if this be absent, the coxa. Cova.—The first easily seen joint of the legs, but it is actually attached to the thorax by a very minute joint known as the acetabulum. The cox are very greatly developed in many groups of Diptera, notably in some of the Mycrropniiip® amongst the Numarocrra. es * “A Nomenclature of Colors for Naturalists’ (Boston, 1886). 62 Xii GLOSSARY. Cross-veins.—Veins perpendicular, more or less, to the longitudinal axis of the wings. ‘They are termed the humeral, subcostal, marginal, anterior, posterior, and discal; whilst in one subfamily of TipuLip™ is found a special cross-vein which I have designated the costal. Cubital vein.—A name applied by the older authors to the 3rd longitudinal vein, Cyelocera.—Schiner’s and Brauer's term for the Noracanrua and TanysToma taken together. Dermatina.— Eremochetous species in the sense that there are no strong bristles on any part of the thorax or scutellum” (Verrall). Verrall’s name for the Scenorrnips and Mypaip™ taken together. Dichoptic.—Applied to the head when the eyes in the male are separated by a distinct more or less broad frons ; as opposed to holoptic. Discal cell.—-The conspicuous cell near the centre of the wing in a large number of Diptera (p. 8). Discal vein.—Some of the older authors spoke of the 4th longitudinal vein under this term. Distad.—Away from, the body or the base of any part; as opposed to proximad. Distal.—Nearer the outer extremity than to the body or to the base of any organ. Divaricate.—Applied to the habit of some insects of resting with the wings (and often the legs also) stretched out flat on the surface of the object ; as opposed to those which fold the wings over the abdomen when at rest. Used by many authors in writing on Tirunipe. Diverticulum.—The sucking stomach in Diptera. Dolichocephalous.—When the head is longer than it is wide. Empodium.—‘‘ A. median appendage on the underside of and between the claws, either in the form of a pad, like the pulvilli, when it is called pulvilliform, or like a bristle or spine; rarely it is alone present and the pulvilli wanting” (Williston). Energopoda,—A. superfamily. ‘‘Chatophorous species in the sense that there are strong and usually numerous bristles on the scutellum and legs; or at least on the sides of the mesonotuin ; except in the few cases in which dense coarse pubescence is substituted” (Verrall). Verrall’s name for the Arroceripm and Asitip®. Osten Sacken also included Douicnorip#, Eupip®, and Loncnoprertp®, and was inclined to admit also PuoripD® into the same group. Epipharynx.—A narrow piece lying immediately below the labrum or upper lip in those kinds of Diptera with a highly developed mouth. Be- tween these two parts, which form a long tube, the insect sucks up moisture from flowers, the blood of animals, or other sustenance. Epistoma, epistome.—The mouth-opening and its immediate vicinity: often used by the older authors to signify practically all the lower part of the head below the eyes, except the palpi and any specially developed part of the proboscis. GLOSSARY, xili Eremocheia.—A superfamily in which Osten Sacken included the Srrario- MYID& (with Xytomyrn«), TaBantp.s, AcaNTHoMERID®, and Luprip: (with XynornAgmym and Ca@yomytn). Verrall adds to these the Nemestrinip&# and Cyrripa. Eremochetous——A term applied to those Diptera absolutely without any strong bristles on the head or thorax, as distinct from ordinary pubescence or such as the bristly hairs in Psycuop1p®, Eucephala.—Those larve possessing a distinct head; as opposed to the ACEPHIALA, Extricate.—Applied to pupx in which, from their mummy-like facies, the outlines of the future imago are more or less distinctly seen. Face, facies.—The term j/ace is restricted to that part of the front of the head below the antennz and enclosed by the cheeks and the upper margin of the mouth. In many cases a well-defined line, ridge or bend in the surface distinctly delimits the face; at other times the limits are formed by imaginary lines drawn between the points specified. acies literally means the face proper, as above described, but is never used in that sense, being employed to signify the general appearance of the whole insect. Facial ridge.—The sides of the antennal fovex. Fascia,—A transverse mark which is more or less irregular in outline, generally with ill-defined edges. Feet—Some of the older authors, as late even as Walker and (sometimes) Osten Sacken, used this term to signify the whole of the legs, but it should strictly be applied to the appendages of the last tarsal joint. The feet of Diptera consist of (1) two wagues or claws (movable curved opposable hooks), (2) the pulvil/, or two pad-like fleshy cushions, and (3) the empodiuwm, a median appendage varying in form from an additional pad to a spiny process. Sometimes the empodium is pulvilliform, occasionally the pulvilli are absent, or modified. Femur.—The first conspicuous long joint of the legs, nearly always the strongest of all; preceded by the coxa and the very small connecting joint between these two called the trochanter, and followed by the tibia. Ferruginous.—-A reddish brown with more or less of a yellowish tinge; rust- colour. Walker describes the word as ‘‘ rusty yellow.” Ridgway gives it as ‘‘ light burnt sienna.” Flagellum.—tThe joints of the antenn after the basal two (which latter are known as the scape). In the Nemarocrra they are nearly always differently shaped from the scapal joints, and very variable in form (pieZl): Forceps—The term employed by Osten Sacken and some others for the male genitalia in such families in which they are conspicuous, complex and formed mainly of a pair of distinct claspers to which various appendages are attached. Fovea, fovee.—See Antennal groove. Frenulum.—A name suggested by Loew for what is generally known as the seutellar ridge. X1V GLOSSARY. Frons, ov Jront.—The space that lies between the eyes (viewed from in front), limited above and below respectively by the vertex and a line drawn through the rvots of the antenne. The demarcation between the vertex and the frons may be sharply defined by a sudden angle in the surface, a difference of colour, or there may be no line of distinct separation. In Libio, for instance, the vertex and frons are practically united and inseparable owing to the flatness of the head. Frontal lunule,—A crescent-shaped or oval space immediately above the base of the antennee, between them and the transverse slight depression known as the frontal suture. This lunule is frequently indistinct, probably often quite absent, although its presence is the only technical means, according to Braner, of determining in the imago state whether a given individual belongs to the Cyctorruarma. It is prominent in the Muscip#, but indistinct or absent in the other three families of the Cycnorrmarua, viz., Syreurs, Prruncunips, and Praryrrzipe,* though Verrall thinks it traceable in certain peculiarities in the structure of the head in these three families. Frontal suture.—An impressed line, or very shallow narrow groove of crescent, shape enclosing the frontal triangle or frontal lunule. Theoretically present in all Cyclorrhaphie flies, but inconspicuous or absent in three families out of the five. Skuse calls it the frontal fissure. Frontal triangle.—The small triangle (with the apex upwards) immediately ' above the base of the antenna, caused by the divergence of the eyes from one another below their region of contiguity. It therefore can only occur in holoptic or sub-holoptie Diptera. Fulvous.—Golden yellow. Gene —The cheeks (q. v.) Genitalia.—Vhe organs of generation. In the male they are technically known as the hypopygium, in the female as the ovipositor. Glabrous.—Osten Sacken uses this term to define bare eyes in Tipunipx. It is also used in connection with descriptions of wings, meaning smvoth and shining. Gonapophyses.—‘* Four free rods that arise from the wall of the genital chamber, two above and two below the base of the penis, and project. backward within the chamber ” (Snodgrass). Halteres.—The ‘ poisers”” of the older school of authors, and “ balanciers” of French writers. The atrophied hinder wings in Diptera, reduced to a narrow short stem with a more or less distinct club at the tip. They are placed behind and below the wing, one on each side of the thorax, Hemicephalous.—A term used by Dufour and others for those Dipterous larvee in which the head is not sufficiently differentiated to include them in the Evucrruana, yet sufficiently obvious to withdraw them from the ACEPHALA,. * Technically it snould be present in these families also, if Brauer’s theory be accepted, and its absence seems to weaken considerably its value as a taxonomic character. GLOSSARY. XV Heterodactyla.—-The second of the two divisions into which Brauer divides his PratyapyyA, which latter is the first division of his Orrmorrimarita Bracnycera. Holoptice.—Used of the head when the eyes are contiguous; opposed to dichoptic. Generally a character of the male sex only, but exceptions occur in several families. Homeodactyla.—One of the two divisions into which Brauer divides his Puaryernya. See Heterodactyla. Hovering.—This term expresses the habit of some flies of remaining quite stationary in the air, then suddenly darting away a short distance and again remaining stationary. Humerus.—Vhe shoulder or anterior corner of the thoracic dorsum; when it takes the form of a more or less distinct bump it is known as the humeral callus. Hypocera.—The name given to a superfamily consisting only of the Puoriw.». Hypopleura.—The pleural area between the metapleura and the hind coxz. Hypopygium.—The male genital apparatus as a whole, as distinct from that of the female. Imaginal disks.—Centres of the formative tissue in the larvae of certain insects especially Diptera, which give rise to the legs, wings, ete. Intercalary veins (Lioew).—The lower prongs of the upper and lower branches respectively of the 4th longitudinal vein (p. 12). The term has been used by subsequent authors for various veins, but without obtaining general acceptance. Johnston's orgav.—A minute structure in the 2nd antennal joint of Diptera which is supposed to contain the auditory nerves. Labella.—A pair of organs, generally more or less oval or rounded, nearly always at the tip (occasionally at the middle) of the proboscis. Labiwm.—The lower lip. In Diptera always the lowest part of the proboscis, and constructed, in the most highly developed forms, more or less like a groove or case in which the remaining parts can be folded and covered by the labrum, Labrum.—The upper lip, the uppermost part of the proboscis in Diptera. Lamella, lamelle.—Small leaf-shaped extremities to the ovipositor in the female. A general term also for an oval or leaf-shaped flattened terminal or projecting process. Lamella basalis supera and lamella basalis infera.—Westhoft’s names for the upper and lower sides respectively of the 8th abdominal segment. He terms the upper and lower sides of the 9th segment (namely, those actually forming the genitalia) Jamelia terminalis supera and infera, but the terms have not been adopted by other authors. Macrochete.—The large strong bristles in Diptera distributed over various parts of the body, which are constant and possess a very high taxonomic value. The study of this subject is termed Chetotaxy. Marginal cell. Mediastinal cell, { 5° Pp- 8 and 18. XVi GLOSSARY. Mediastinal vein,—Ideutieal with the auxiliary vein, that is to say, the first vein below the costa; also known as the subcostal yein, but some authors (including Verrall) employ the term subcostal for the Ist longitudinal vein. This appears illogical to the present author, since the very name subcostal suggests a position immediately beneath the costa. . Mesopleura.—The pleural area immediately in front of and slightly below the roots of the wings. Metanotum.—The hindermost portion of the thorax, situated directly below the scutellum, highly developed in some families of Numarocnra, especially the ‘Yreunip2. Metapleura.—The pleural area immediately behind and slightly below the root of the wings. Metapneustic.—Used of larvee in which the spiracles are confined to the posterior segments only. Metatarsus.—The Ist joint of the tarsus, that is to say the one adjoining the tibia, the following joint of the tarsus being the second. Microchete.—The smaller bristles in Diptera, distinct from pubescence or hairs, but not of sufficient size or importance to rank as macrocheetze, and therefore of much less taxonomic value. Microphona.—Verrall’s name for the Emrr® and Doricnoriw.. Mystax.—The “moustache” ; strictly applied to the long hairs on the cheeks ; seldom, if ever, present in the Nemarocrra, most conspicuous in the very pubescent groups of Bracnycura, such as Astnip£, Bompyiiip., ete. See Barba. Neuration.—The older authors’ name for venation. Niie blue or Nile green.—A somewhat pale shade intermediate between blue and green. Notacantha,—Brauer’s term, used by other authors also, for the SrraTionyip”, “ XYLOPHAGIDE”’ (regarded erronously as a family) and Cayomyipx. A superfamily, in the view of such authors. Nyiph.—The name applied to the pupa when it is active and not fixed. Obtecte.—Applied to those pupx that shew no sign of the shape of the future imago. Occiput.—The hinder surface of the head. Ocellar triangle and ocelli.—The simple eyes in Diptera (or other insects) are placed on a triangular spot on the vertex of the head, which is generally elevated (sometimes considerably so) above the surface, called the ocellar triangle, the ocelli being placed at each corner of it, when there are three. Sometimes there are two only, sometimes they are absent, but in no instance are there more than three. In some families they are well separated (Mycrropninip®), when they are placed directly on the frons, in the form of a more or less flattened triangle, cr in an absolutely straight line. As a rule they are very constant characters when present. Ochraceous.— Of the colour of brown ochre with an admixture of yellow. Orbit.—The margins of the large compound eyes, whether such are distin- GLOSSARY. xVvil guished by a distinct ring, ridge, or well defined space, or not. The frontal orbit is that part of the orbit immediately abutting on the frons. O thocera.—Schiner’s and Brauer’s name for the BomByLimorpiaA, PRocEPiALa, and Poryroma. Schiner, however, includes Leptip® in the Orrmocera, Orthogenya.—Brauer’s second division of his Ortuorruarina Braciycera, composed only of Empipx® and Doricnorips. Ovate.—Egg-shaped, that is, an ellipse more pointed at one end than the other. Oviposition —The act of depositing eggs by the female. Ovipositer.—The female genital organs, as distinguished from those of the male. Palpi, palpus.—These organs in the Diptera possess from one to five segments ; the vast majority of Brachycerous flies having only one segment, and the Numarocera four. In many groups they are rudimentary, in others absent (p. 19). Pectinate.—When the vestiture of the antenne is stronger than stiff pubescence or verticillate hairs and takes the form of stiff bristles, or branched pendulous or yariously formed solid projections, they are termed pectinate. Pectus.—The breast. Walker used it to denote the lower anterior part of the thorax. Modern authors do not, I believe, employ the term. Peripneustic. head- and tail-ends, are so called. Peristoma, ov peristome.—Apparently a synonym of epistoma, Piceous.—Blackish brown ; pitch colour. Pile.—A very closely set and very short pubescence of erect hairs resembling Larve with spiracles on the median segments, as well as at the the ‘‘ pile” of velvet. Platygenya.—Brauer's first division of the Orrnorrmarua Braciycera, com- prising all the families except the Emr1rp%, Doricuorip®, and Loncnor- TPRIDE. Pleure.—The sides of the thorax are in many Diptera separated into fairly distinct divisions by two sutures running longitudinally to the axis of the body, and by one perpendicular or transverse suture. The upper suture is the dorsoplewral (or more correctly notopleural); the lower longitudinal suture is the sternopleural. The vertical suture (though it is seldom either straight or absolutely vertical) is the mesopleural. The pleurz (or spaces) are named the proplewra (or prethorax), mesopleura, and pteropleura, the two latter divided from each other by the meso- thoracie suture. Below the sternopleural suture are, the séernopleura (in front) and the kypoplewra (above the middle and hind cox). The meta- pleura is a more or less indistinct space behind the pteropleura and hypopleura, and adjacent to the metanotum. Plumbeous.—Leaden colour, which may be dull or shining. Poisers, or balancers.—The older authors’ terms for the halteres. Pollinose.—An expression used to define a surface with a light dust-like covering, resembling pollen; a finer vestiture even than tomentum. Polytoma.—Brauer’s (and Bezzi's) name for a superfamily consisting of the THEREVIDA and SCENOPINID®. XVill GLOSSARY. Porrect.,—Projecting straight forwards ; applied to antenne or palpi. Post-alar callus.—A more or less distinct, rounded swelling situated between the root of the wing and the scutellum, often inconspicuous or absent. Posterior legs.—The hindermost four taken together, the last pair only being termed the hind legs. Postical vein.—The 5th longitudinal vein. Prefurca.-—The portion of the 2nd longitudinal vein lying between its origin and its forking. ‘This is the sense in which Osten Sacken employs the term and in which it is used in the present volume, but Verrall uses it in the Bracnycera to denote “ the common origin of the 2nd and 3rd veins,” in other words for only that portion of the 2nd vein between its origin and the origin of the 35rd vein, Pre-alar callus —A more or less distinct, rounded swelling in front of the root of the wing, on the side of the mesonotum, just behind the outer ends of the transverse suture. Pre-sutural depression.—A quite small depression, generally triargular in shape, situated at each end of the transverse thoracic suture, close to the commencement of the dorsopleural (notopleural) suture. Procephala,-Brauer’s name for the superfamily containing the Mypaipx, Asiiip® and Bompyniuipe ; Bezzi also adopts it. Propygium.—Bergroth’s name for the hypopygium. Prothorax.—The anterior part of the thorax, in Diptera often indistinetly marked off from the main middle part or mesonotum. Proximal.—Nearer to the body of the insect, the base of a wing or leg, and so on; as opposed to distal, distad. Proximad is the corresponding adverb. Pscudotrachee.—Radiating ridges on the inner opposable sides of the labella in many Diptera, which ‘‘serve as a means of attrition, by which the insect rubs off particles of food from firm substances ” (Williston). Pteropleura.—Vhe pleural area immediately below the root of the wings. Ptilinum—A small but powerful bladder-like organ, present in the Cycnorruaria only, situated just above the base of the antennz on the frons. It is only used by the insect to escape from the puparium, by inflating it, upon which it protudes through the frontal suture and springs off the cap of the puparium, Pubescence.—The clothing of soft hairs common to nearly all Diptera in different degrees, not short or dense enough to be known as pile, nor containing bristles. Pulvilli—* Two pad-like fleshy cushions attached to the last joint of the tarsus below the claws, usually present, but often absent among the Ortnorrmarna, and often much larger and better developed in the ¢ than the Q” (Williston). Puncture.—A winute indentation of the surface. Radical cell—A term used by a few of the older authors for the basal cells. Rhomboidal cell—A small four-sided cell near the end of the costa in Tirunips. At first Osten Sacken called it the trapezoidal cell. GLOSSARY. x1x Rostrum, or snout.—The usual, more or less cylindrical, anterior prolongation of the head that projects over the proboscis proper, most conspicuous (amongst the Numarocera) in Treutins., Probably some of the older authors used the teri to include both the rostrum proper and the proboscis also. Scape, or scapus.—The first two (or basal) joints of the antenne, nearly always differentiated from the rest. In the Nemarocura, the 2nd joint is generally much shorter than the Ist, and the Ist joint of the flagellum (i. e., the remaining joints taken together) is usually longer than the others. The scape is in nearly all cases sufficiently obvious. Scutellar ridge.—A sometimes very conspicuous hardened ridge joining the sides of the scutellum to the thorax. Often inconspicuous or absent. Loew has suggested for it the name “ frenulum.” Scutellum.—The semicircular or crescent-shaped small piece affixed to the hinder margin of the thoracic dorsum. It often bears important bristles or spines, though less frequently so in the Newarocera than in some other groups. Seta.—Applied to a somewhat long bristle-like hair. It is also used to designate the microscopic stiff hairs with which many wings are covered, and which are invisible to the naked eye. - Setigerous.—Provided with seta. Spurious cell.—See p. 15. Squame.—The most correct term for the scale-like organs (one covering the other, either equal in size or the lower one much larger than the upper) found at the root of the wings in the higher Diptera. The upper or anterior one is fixed to the base of the wing behind the alula and is most correctly termed the alar sguaima or squama alaris; the hinder or posterior one, whieh in all the higher groups of Muscrp# and other families is always much larger than its companion, is attached to the thorax and is therefore most correctly called the thoracic squama or squama thoracis or thoracicalis. The presence or absence of these organs gives the distinguishing names of Canyrrrata and Acatyprrara, dividing the Muscrp © (sensu lato) into two great groups, above subfamilies and approximately of equal extent. The line of demarcation, however, is not absolute, many small Anrnomyip& having squamz of equal size and very little larger than those found in the AcaLyprrara, in which group, moreover, exceptions with squamez of comparatively large size are found. Some authors call them tegulx, calypters, or (erroneously) alulzx. Sternopleura—The pleural area forming the lowest part of the ventral surface of the thorax, developed chiefly between the fore and middle pair of legs. Sternum.—The lower surface of the thorax. Sternites—The plates on the lower surface on the body of an insect, but here specially used to denote the ventral plates of the abdominal segments, the numbers of which are counted from the base outwards; opposed to tergite. Stigma.—This is used in two distinet senses: (i) In the wings of many Diptera is a more or less clearly defined, darkened (generally yellowish, brown xX GLOSSARY. or black) spot of oval or some such shape, towards the costal margin, a little or considerably beyond the middle of the wing, bounded usually by the auxiliary and Ist longitudinal veins. Thisis the stigma in the most ordinary sense of the word, as used by systematists. (ii) Four very small apertures, easily overlooked, generally situated each at the bottom of a small pit, are termed the prothoracie and metathoracic stigmata respectively. The former are placed, one on each side, below the shoulders towards the front; the latter, immediately in front of the halteres. The prothoracic stigma is by some called the mexothoracic. These stigmata or spiracles serye for the admission of air to the respiratory system, Style.—Used in two senses: (i) The elongate, conical, blunt or pointed solid appendix to the ultimate joint of the antennx, as opposed to the arista (g. v.). (ii) Osten Sacken’s name for ‘a single inmovable styliform organ,” visible immediately below the genital organs in Liwnositnr. Not seen in other groups in the same form, but replaced by the aculeus, “a slender, horny, often curved and pointed piece, which is entirely concealed when the forceps is closed and projected when it is open” (Osten Sacken). Subapical cell. Subcostal cell. Subcostal vein.—Strictly, the vein below the costa, which in the present work is called the auxiliary vein (after Osten Sacken and many recent authors). Verrall and some others apply the term tothe Ist longitudinal vein. Submarginal cell.—-See pp. 8 and 13. Supra-alar groove-—A groove on the mesothorax just above the base of the wing, short and often indistinct. In bristly species, important bristles are often situated there. Suture.—A general term for an impressed line. The principal sutures are the transverse (p. 5), on the thoracic dorsum, and the pleural (p. 5), on the sides of the thorax. | See pp. 8 and 13. Tanystoma.—Brauer’s superfamily name, adopted also by various other authors, for the TABANID& and Leprrip x. Tarsus.—The third and ultimate of the conspicuous divisions of the legs, always of five distinct though often closely applied joints, of which the first is called the metatarsus, the next is the 2nd, and so on, the 5th bearing the feet. Tawny.—A pale brownish yellow colour varying in intensity, approximately of the colour of a lion. Tegule.—See Squame. Tergite-—The plates, or sclerites, on the upper surface of an insect ; here more especially applied to the upper half of an abdominal segment, these being numbered in rotation, beginning with that one nearest the thorax. Tergum.—The upper surface of an insect. Testaceous.—Technically brick-red, according to handbooks on colour, but my personal opinion is that most authors have used it for what may be better described as ‘‘ reddish yeilow.” GLOSSARY, XX1 Tibie.—The second of the large conspicuous divisions of the legs, generally longer and thinner than the femora, and normally longer than the tarsi. In some families and genera one or two spurs or spines at the extreme tip furnish valuable characters in classification. Tomentum.—A. vestiture of exceedingly short, semi-erect hairs, finer and shorter than those known as “pile.” Williston says that tomentum can only correctly be used to desiginate ‘flattened, scale-like or stubble-like, more or less recumbent hairs which gradually merge into dust or pollen.” Transverse.—At right angles to the longitudinal axis of the body, such as the transverse suture on the thorax; or to the length of the wing, such as the “ cross-veins.” When applied to the head or proboscis it means broader than long. Transverse suture.—See Suture. Transverse veins —See Cross-veins. Trapezoidal cell.—See Rhomboidai cell. Trochanter.—A small, generally annular joint uniting the coxa to the femur. Tromoptera.—Osten Sacken’s superfamily for the Newesrrinips, Cyrtipe, Bomsyiup#, THEREVIDE and Scexoriip#. Verrall confines it to the Bompyiiip# and THEREVID&. Truncate.— Ending abruptly, as if cut off. Ungues.—The claws, two in number, affixed to the lower side of the 5th (ter- minal) tarsal joint. The remaining portions of the feet consist generally of the pulvilli and the empodium. Vena spuria.—Only present in the Syrpnipx, a family of the Bracnycura. It runs in front of the 4th longitudinal vein and is merely a fold or crease in the wing and not a true vein. It is sometimes indistinct but invariably present in this family except in the genus Graptomyza. Venation.—The system of the veins in the wings. The older dipterologists spoke of it as the mewration, a synonymous term used in other orders. Ventriculum.—The true stomach in Diptera, as distinguished from the diverticulum or sucking stomach. Vertex.—The upper part of the head, lying between the upper angles of the eyes, merging in front more or less abruptly into the frons (g. v.). An imaginary line between it and the back of the head (or occiput) is called the vertical margin. Vertical margin.—The marginal line between the vertex and the occiput. Vertical triangle.—The small, often extremely small, space in holoptis flies between the absolute vertex and the spot where the eyes first touch each other. It bears the ocellar triangle (when such is distinet), which in its turn carries the ocelli, when these latter are present, Verticillate.—W hen the joints of the antennz are provided with verticels. Verticel, or verticil.—A whorl of hairs arranged around an antennal joint in the form of a circle. Two or more such whorls may be present on the same joint. Xxil GLOSSARY. Vestiture.—The outer adornment of the surface of the body, which generally takes the form of short hairs, yet every variety and intermediate grade from strong spines to the finest dust may be found. Large spines, isolated and regularly placed, or numercus and irregularly placed, are spoken of as such. Bristles, the position of which is constant in the genus or species are referred to as chatotactic bristles, and are most valuable adjuncts in classification; they are named according to their situation on the body (see Chetotazy). Irregularly placed bristly hairs (such as are met with in abundance in Psycnoprpm) have no technical term, Finer vestiture is known as hair, if comparatively long and in any way coarse, shaggy or woolly; if fairly short and fine, it is known as pubescence, and this is the commonest form of all. Very short erect closely set hair is known as pé/e; a shorter vestiture still is called tomentum ; after which the finest form recognised is termed dust, or the surface is said to be pollinose. Vinaceous.—The colour of light claret. Vitta.—A short longitudinal stripe or mark. SYSTEMATIC INDEX. Page Suborder ORTHORRHAPHA. 40 | Subfam. 8. Serophiline ..... Fam. 1. MycrTroPpHinip® 44 1. Sciophila, Mg. ......... 1, bicolor, Brun. ....... Subfam. 1. Macrocerine..... > 2) ie ariel ra ee Sata 6 1. Macrocera, My.........- . 49 Z: con Brun. 1) ommata, Bran... ..-- 51 ‘ SPS) esl aie olen ene 2. alternata, Brun. ...... 52 = ee Brun. .... Seeicota, Baio... . 08 5. ferrugimea, Brin Be Mona a Vearnban Brant, eas: 4: 53 6. trilineata, Bran. ..... 5, elegans, i ae . d4 3 bese Brun. ..... 6. inconspicua, Brun. oe G. a Pel euree agi ae aly 7. ferruginea, Brun....... 55 avithorax, Bran. a 5 2 LOs curvilimes, Bruv....... ‘ lepta, Wi. me te as | eee FR ¢ q , "14 1. Ceroplatus, Bose. ........ 56 2. ineerta, Brum. - 2.25: = ce etapa Brun.. ?* | Subfam. 4. Mycetophiline 2. Su 001A" cs ee 53 1. grandis, Brun........ Se GO R tenlammanishe WG. 2 ec ee. va x 2. suffusinervis, Brun..... 60 L brevirostris, Brun. 3. apicipennis, Brun. fal 2. spathulata, Bran. 4, atlinis, Brun. sige 2. Leptomorphus, Cart. 5. marginata, Brun....... 62 I. ornatus, Brun. ....... 6. flaviventris, Bran. 62 3. Paleeoanaclinia, Mewn.... 7. vicina, Brun. .... +: a4 Gs 1. flavohirta, Brun..... 8. venusts, Walk. ...... 63 4. Greenomyia, Brun. ..... 9. octosegmentata, Brun. . 64 i, niericoxa, Bye. 12a 10. ruficornis, Brun. ...... 64 5. Allactoneura, Mey. ..... 11. indistincta, Brun. b6 (SD) He -cimeta, Meije cepa sre 12. longifurcata, Bran. .... 65 3. Odontopoda, Aldr ..... 13. funerea, Brun......... 65 Ls. indica, Brin): Boles. 14. flavomarginata, Brun... 66 7. Anomalomyia, Hutton .... 15. fumipes, Brun......... 66 ligmrhatehvete, Je0G0. so Saee. 3. Isoneuromyia, brun....... 66 8. Acrodicrania, Skuse ..... 1. annandalei, Lram...... ag OK 1. ferruginea, Brun, 2. rufescens, Brun. ee, OOo, Do incerta, Bw... XX1V Page 9. Clastobasis, Skuse ........ 94 Tyittigerayebrgt. ok <<: 95 RO MIGeI gO as ec es eel 96 alr winthemi, Lehm. 97 2. flavobrunnea, Brin: i. 90 3. arcuata, Ti aes 99 4 lorte@llaiy, Jéy0i0y geo dee 100 De MMSIODIG BV UM. 5. 5 o% o> 101 PemOUA, BYU. — crete bain 101 7. spathulata, Brun. 101 11. Rhymosia, Winn. ........ 102 1. flavolimbata, Brun..... 108 2. genitalis, Brun. ...... 104 3. albolater ‘alis, ISTO Ds 5 3 0 104 4, annulicornis, Brun. .... 105 5, humeralis, Brut. de. . 106 Gretascipes, B71. 2. tars 106 12, ONINC CRAs Goo o anos < 107 1. nigrofasciata, Brun. .. 108 13. Macrobrachius, Dzied. .... 108 1, loneicosta, Bruit. oa. ee 109 Ape homies: 127172. s.0e een 110 i eimplex, BrUmie. caieiaee lil 2, semifumata, Brun. 111 Ise Ivey VVise 9 66 bs. 0 112 i). basilimess:/37:2072. sya 115 16. Mycetophila, DUT). «333s cxeuctaer 113 1. cinctiventris, fe Sarees 115 2. quadrifasciata, Brun. .. 115 3. oriseolateralis, Brune, AG 4. curvilinea, J EVPLI On 0 OG oe 116 5. suffusa, Bru, . cee WALy 6. himalayensis, Brun. 117 7. binotata, Brun. ...... 118 Le sWelopsis, Shuse 2.) 4-0 says 118 1, Gollleints; JET, gaoccaat 119 [esghuryschalis, Brun. .% :...: 559 1. spectralis, Brun. ...... 560 Subfam, 5. Searine ........ 119 LS Pata IG Ante ks cs ea 120 1. -tmlineata; Brun. ...... 126 2. trifasciata, Brun....... 126 3. opposita, Brun. ...... 127 4, distinguenda, Brun. 127 5. rufithorax, Wulp...... 128 6. rufoabdominalis, Brun. . 128 7. luteiventris, Brun. .... 129 8. flammiventris, Brun. 129 Onn dican7al ic. eee 13 10. flamofemorata, Brun... 156 11. nigripennis, Brun. 131 12. diversipes, Brun....... 131 13. fratercula, Brun....... 132 ld exacts, Brug... .. se. 152 | Fam. 2. SYSTEMATIC INDEX. 15. 16. te 18. 19. longinervis, brwn. flavicollis, Brun....... orientalis, Brun. fascipennis, Brun. sexsetosa, Brun. .....- 20. quadrisetosa, Brun. .... 21. pallescens, Brun....... 22. fulvescens, Brun. 25. setilineata, Brun. 24. latelineata, Brun. .... 25. radicum, Brun. 26. impostor, Brun. 27. segmenticornis, Brun... 28. compacta, Brun....... 29. inconspicua, Brun. .... 30. hirtilineata, Brun. 51. niveiapicalis, Brun..... 32. longipennis, Bran. 33. flaviseta, Brun. a ee vo aiacevteite ke Ce Otter ieriet longitudinalis, Brun. TUCO Kai /5 70070 ee ee 37. flavipleura, Brun. 38. evanescens, Bru. 39, parallela, Brun. ...... fe oD. 36. 3LEPHAROCERID® 1. Hammatorhina, Loew li, Mella; Wisp oe wee einem 2. APIStODNVIGs 09 ates ware 1. trilineata, Brun. 3. Blepharocera, Macq...... We atelier, JEVAVOs. awo aaa c amis UBL Zee eee - Subfam. 1. Bibionine ........ 1. Pleciomyia, Brun. .. 1. melanaspis, Wied. .... 2: Plecias Wed, once pees 1. fulvicollis, Fabr. ...... 2. tergorata, fond. ...... 3. indica, Brun. A IPRE DG HRY oye P/ Omen cncheret Oba Ie 5. obscura, BUI 5-56 Aas Bibio, Geoff. i hortulanoides, Brun. iB) pe) e)@) eh ene 2. obscuripennis, Me). 3. proximus, Brun. ...... 4. abdominalis, Brun..... approximatus, Brun. discallish Bienen johannis, LZimm. ...... rufifemur, Brun....... 9. foscitibia, Brwn.... .. Caton eal SYSTEMATIC INDEX, Bibio (con.). Page | 10. defectus, Brun. ...... 176 | 1. squaminervis, Brun. 1]. flavohirta, Brun. ...... 561 2. annandalei, Brun. . 4. Dilophus, Mg. .......... 176 | spinicornis, Brun. .... I. gratiosus, Big......... 178 | . mMargininotata, Brun. .. | inetatarsalis, Brun... .. Subfam. 2. Scatopsine........ 179 1. Seatopse, Geoff...... oceans 1. brunnescens, Brun..... 180 2. nigronitida, Brun. .... 181 MEOH, PU oe ee os proxima, Brun. lacteitarsis, Brun. : gilvipes, Brun......... impunctata, Brun. et SO CNIS? OUP oo Fam. 4 SimuLmp..... Rin A Be 11. unicolor, Brun. ...... beh ntia a DOTUNCHIA, AMIE o's. os densmnltom:, Mate... cs 182 1. superstes, Ann. ...... ils rufithorax, Brun... 187 4, Parabrunettia, Brun. ; 2. grisescens, Brun. ies pe 1. squamipennis (Brwuz.). . ae metatarsale, Brun. .... 189 2. atrisquamis, Bra. ‘ 4, griseifrons, Brun. .... 190 3. albohumeralis, Brun. . . 5. rufibasis, USAPUTUS © ore: 3, cots 190 4, argenteopunctata Gosemile; Bru wes e nose LOT (CT Wee aac athe ins 7. indicum, Bech......... 191 5. 9-notata, Brun. ...... 8. aureohirtum, Brwn..... 194 6. flavicollis, Brun. . : me C 9. striatum, Brun. ...... 561 7. longicheta, Brun. cy | x = Han Sp esveuonipas .....0, [96 | Bant.6. Drewm 2.5.2...) 6.5% | i d, Dixs, Me ‘ o | te Dina, Mg... 1.2222 se. Subfam. 1. Phlebotomine .... 199 ‘ye RIE Teme oe 1. Phlebotomus, Rond....... 199 2. montana, Brun. ...... ]. himalayensis, Ann..... 204 3. maculipennis, Brun. .. 2. perturbans, Mezj....... 205 A, histriata, Brun. ...... 3. minutus, Rond. ...... 206 Oy DILASCTAUA, TEU TOsn ae ase 4. argentipes,dnn.§ Brun. 207 | K 77 . : ‘7 49 Oe Wa Or Aree a sci ye ais 210 | OIRO pe SOLER Leos Cay \e 1] y » . 6. papatasii, Scop. ...... - | Subfam. 1. Ptychopterine 7. malabaricus, Ann. .... 214 : 8. zeylanicus, Ann. ...... 215 | bef tychoptera, 1 CEO ae eee | levdishineta, a) 200. ce. 6s. Subfam. 2. Psychodine ...... Fe | 2. tibialis, oo5 aes wane | By EIADURMTh Joy 0p dae ate ieebsyehods, Lair... 0:5... 218 | ee igh ae 1. apicalis, Brun. ...... -. 223 | Subfam, 2. Tipuline ......... 2. maculipennis, Brun. .. 223 | 3. albonotata, Brun, .... 224 | Sect. 1. Ctenophorini.... 4, distineta, Brun py A ; a chin Goan, Inonenw Wis Boece: Re decoy. Arun: o..:..- 226 | 1. cages : a J Walk 6. transversa, Brun. .... 226 | 5 Paellio roa On ee ee Ct) : aT S ra, 5. A ° . 7. hirtipennis, Brun, .... 227 sat ae renicul. . QQ7 > IBS JER eo 6c ane 8. geniculata, Brun. .... 227 > S . 4 atl | 2. taprobanes, Walk. 9. albonigra, Brun. ...... 228 oe valine tne aaa 10. bengalensis, Brun. .... 229 a ee eattat ae Iie Ray ih, distans, Brute wa ..2.. . 230 | ee ee ore Br “poe 12. albopicta, Brun. ...... 231 | 5. serraticornis, Brun..... . Ctenacroscelis, End....... 1, sikkimensis, End. oo 18. orbicularis, Brun. .... 231 14. nigripennis, Brun. .... 232 15. fulvohirta, Brun 2a ee : ae AGP arc th Ua: 750 SERA h AM! © aae| ia ed Oa 8 OA 16. vittata, Brun. ........ 933 | Sect. 2. Tipuli eereorigomia,. “Wale. se... « 23 1. Tipula, Zimn......... Mere XXv1 SYSTEMATIC INDEX. Tipula (con.). Page I yenusta, Walk. .2)4..-3802 2. gracillima, Brun....... 302 3. Majestica, Brun. ...... 305 4. fulvolateralis, Brum. 304 5. fumipennis, Brun. 305 6. princeps, Brun. 306 Ged ES, TEUUN sau wees sores fob, EAR STATES oe ooo Ao po lle! 9. fumifasciata, Brun..... 308 10. serricornis, Brun....... 309 11. pulchenima, Brun,..... 810 2: fuscinervis, Brun. .... d12 15. patricia, Brun... .....+% 315 14. splendens, Brun....... 314 Is. reposita, Walk. ..-., 810 16. himalayensis, Brun. .. 515 Wis tessellatipennis, Brun. . 317 18; robusta, Brun.....«...,-8l9 19. marmoratipennis, Brun. 319 20, quasimarmoratipennis, DIUM we el ais ivelle. nas Be 320 21. griseipennis, Brun. .... 321 22. elegans, Brun. 323 23. nigrotibialis, Brun.. 324 24, striatipennis, Bram..... 825 Deln SUMO LINCiAs S721. ahs chee 326 26. interrupta, Brun....... 327 27. nigroapicalis, Brun. 328 28. continuata, Brun. : 328 29. walker (Walk.) ...... 329 30. melanomera, Walh..... 330 31. quadrinotata, Brun. 33 32. ornatithorax, Brun..... 33 Don VicCaLlae: PAG amie ee BBY) 34. brunnicosta, Brun. 3o2 30. tenuipes, Braun. ...... 353 36. ochripes, Brun. ...... 334 387. flavescens, Brun....... 304 38. demareata, Brun. 309 39; munda, Brun. .......2 396 AO) Glink By JoyP0ia Gag ee se 307 Al. eracilis, ETFO 5°56 6.05 6 388 42, cinctoterminalis, Brun. . 358 43. elegantula, Brun....... 389 2, Pachyrhina, ifacg. ... .': B59 1. serricornis, Brun....... 34] 2. puncticornis, Brun..... 343 3. pleurinotata, Brun.. B45 4, demarcata, Brun....,... S44 5. econcolorithorax, Brun. . 346 6. consimilis, Brwn.... 346 7. gamma, Brun. ......-. 347 &. javensis, Dol. 76. 3s 348 9. dorsopunctata, Bran. .. 350 10. bombayensis, Macq. 351 Sect. Page Sect. 3. Dolichopezini 353 I. Dolichopezay Curt... ...... 353 1. orientalis, Bran. ...... 304 2. obscura, Brun...... 359 Oo PONMGA, IMME ei oss 564 4. infuscata, Brun. ...... 565 Subfam. 3. Limnobiine ...... 356 Sect. 1. Cylindrotomini.. 358 1. Cylindrotoma, Macq. .... 859 iB eas. Brun. 361 » Lim nto Wai ee Oe il ase ae WED Miia coets «9: 365 1, marmoripennis, Brun... 369 2. demareata, Brun....... 3870 3: hoWusi, Met. ete cima 371 A. absens, B72. odes eee 5, cuneiformis, Mez. 372 6. saltans, Dol... .. 375 7. longivena, Edw. ...... 374 8, pulchripennis, Brun, 376 9. puncticosta, Brun. .... 377 IOS chiens Joy 070R oan ac . 378 11. fascipennis, Brun. .... 579 12. subfascipennis, Brun... 380 5. ornatipes, Brun. ...... 380 14. cinerascens, Brun. 388) 15. cinctiventris, Brun..... 382 16. sordidaMbrunts... 02s. Boe 17. delicata, Brun......... ooo 18. flavobrunnea, Brun. .. 3884 19: simplex, itemeres.s 384 OG Meritt Jee. snabo5 ox _ 385 21. nigrithorax, Brun. .... 385 22. subtessellata, Brun..... 565 23, bicinctipes, Brun. 566 24, columbina, Brun....... 567 25, approximata, Brun. 567 26. imnocens, Brun. ...... 568 Geranomyia, Hal......... 387 Ie wemitalis) 572071... nen 588 Dail awl OSta po) 201). tanga 389 3. circipunctata, Brun. 390 Al vialaleritsly Jey0NOe yan dodo 391 5. vinaceobrunnea, Brun. . 3892 6, fletehert, Hdw..... syne 7. pulchripennis, Bren. 393 8. semistriata, Brawn. 394 9, semifasciata, Brun. .... 895 3. Limnobia, Mg. 5 96 festival 3 7:2072 seater 400 2. tinctinervis, Brun. 401 8. InGich, Brae peace 401 SYSTEMATIC INDEX. XXVil Limnobia (con.). Page Page 4. trimaculata, Brun. .... 402 PO LONA yn EPI, th Seba. 455 5. longinervis, Brun. 405 10, grandior, Brun. ...... 456 Gy centralis, Brum. 5.2... 405 Wile oenitalis, EVO. 3 wehbe 456 fa mivempes, Bruns... 2. 2h 404 12. halter: -ata, PUT IN Sod, 457 S.MISUR, BTU. cies.» 404 4, Mesocyphona, Os. Sac. . 458 9. vitripennis, Brun. .... 405 1. nigripes, Brua......... 458 10, triangularis, Bram. .... 406 5. Styringomyia, Lw......... 459 4. Ceratostephanus, Brun. 406 1. ceylonica, Edw. E 46 1, antennatus, Brun. . 407 2. obscura, Brun. ........ 463 Atypophthalmus, Brun. .. 408 a, BV Bige IUII S A eR aah 46 1. holopticus, Brun....... 408 6. Lechria, Shuse> ...0.5. +3. 465 6. Libnotes, Westw. ........ 409 1. bengalensis, Brun. 467 1. fuscinervis, Bram. 4ll te GOuonivie Mg. se 3. ee 468 2. notatinervis, Brun. .... 412 Ts incompleta, Brun. AT] 3. punctipennis, Mei. . 415 2. flavomarginata, Brun... 472 AP TU MA a dace sa. «=o ALA 3. affinis, Brun vo... 472 4, aperta, Brun. ; 75 Sect. 3. Rhamphidiini 415 5. proxima, Brun. ...... 474 1. Rhamphidia, My. ........ 416 (3, GMO, Jiis 65) Manes 568 1. ferruginosa, Brun. 418 8. Empeda, Os. Sac. s 47 O. unicolor Brunt.. .2. .-. « 419 1. inconspicua, Brun. ee: 3. inconspicua, Brun. 419 9. ee VW esti. tt ete Ae 476 De AR ORON MINES LA roi orsioid 9.5 5 420) 2 peamipes, Os. Suc, 479 1. incerta, Brun. Sno 429, tenera, Os. Sac, : 480 BS Ormmarca, Os. Saeec. 6. cs.65 493 3. pallidiventy 8, Brun. 481 1. peregrina, Brun. ...... 404 | 10. Mongomoides, Brun....... 48] MukGthchal Os. Sac ” 495 1. trentepohlii, Wed. . 482 1 dics Rain MbigahAl a 426 2. marmorata, Brun. = 483 2, nedta B “wn. 497 ri epee ay ees "re ee ~ Sno y QF . albogeniculata, Brun. .. 568 re oe ee hag ta oon 11. Paramongoma, Brun. .. 484 Pe UNSISMIS, BUI. «o . aie ss 43 12. Syimplecta, Mg ee ae oh” 485 3. biannulata, Braun....... 430 6 1, punctipennis, Mq. 486 4, cyanea, Hdw. ........ 431 | 18. Fe eee OF ee oe 6. Gymnastes, Brun. ........ 432 = Siena ar ae I, Qakollercevts Jy HV0s een ae 455 2) GRITS Bi Dene al fe Atarba, O8SG0. 2 6 oo. 43- 5. furcata, Brun. ........ 491 NEV IPILI: soe lh ees 455 4. strenua, Brun. .... 492 On aperta, Brun... 5 63.02 A492 , ae rae e 6, incompleta, Braun. .. 493 Sect. 4. Hriopterini...... 456 7 ie Bain ay 3. A494 1. Rhypholophus, Ao/....... 440 | 14. Dasymallomyia, Brun..... 494 1. geniculatus, Brun. 441 Po siondta, Brun... oa) 3: 495 ee PMLEDER DTU... 6 5. AAD || how. Conosia, Walp .- i... oe 496 2, Molophilus, Curt. ........ 445 Wrarrovata,, Wed vx oc. sas 497 1. inconspicuus, Brun..... 444 | 16. Cladura, Os. Sac. ........ 499 2. assamensis, Brun. . 445 1. flavescens, Bram. ...... DOL 3. Erioptera, My. pee oo) Le. baracladura, Brum, - 0 2... 502 1, punctipennis, Bran. 449 1. gracilis, Brun......... 505 2. terruginea, Brun. ...... 450 2. elecans; Brim. 4.5 «1 5O4 Se OUSHALS) CLTHILy carat oi =< 451 | 18. Claduroides, Brun. ...... 505 A. brevior, Brun. ........ 452 1. fascipennis, Brun. 505 5. incerta, Brun. ..... 452 2. SOLGICR DRUG. cave 5 - 506 6. parallela, Brun. ...... AUS | rie ee 7 Eee NG, Be Wo) | sect, 5. Amalopininsss..05 507 8. subtineta, Bruna. ...... 455 JE METIGHOGERa eigenen sce «a 508 XXVill SYSTEMATIC INDEX. Trichocera (con. ). Page u, is) 1. ocellata, Waik.«.i...- 2. punctipennis, Brun..... SLAMS IU irene tonsa e tee AMON GALE, Ps 70072 te eestor PATIOS, “LLC Sen ele sae ate 1. glabripennis, Brun..... 2. elegans, Brun...2.. +23 3. Amalopina, Brun... .. Brake 1. elegantula, Brun....... 4, Rhaphidolabis, Os. Sac. .. 15 Watcha Mors anda act 2. fascipennis, Brun. .... Sect.6. Limnophilini.... t Limnophila, Macy. “a. 23; 1. pallidicoxa, Brun. .... 2. simplex, Brum... 2. +. 3. multipunctata, Brun. 4. honesta, Brum. ........ 2. Dicranophragma, Os. Sac.. 1. pulchripennis, Brun. SPEC A, INC aes xt tcte une 1. fascipennis, Brun. .... yy OWN aie GAS oho och: Secta(. Amisiomeri nd vce id; Briocera;Maeg:.5 6.. a: ie ctenophoroides, “Edw... Qe sseutellata,eLGes. wie. 3. rufithorax, Brun....... 4. fenestrata, Bram. ...... 5. humberti, Os. Sac. 510 511 512 513 513 515 516 516 | 517 1 Or or ono 7 w) O1o Go oO oan bat 6. meleagris, Os. Sac. .... 7. pachyrrhina, Os. Suc. .. S82 Wadia, wis «sees eo QO. TUMDaSIs, Wr... 3 MORAINE VEO Ao gonebe Ibs green, Brie. ce ess 12. aterrima, Braun. ...... DB: Masta, Lea ee eek ae 14, erystalloptera, Os. Sac. . 15. plumbicincta, Braun. .. 16, elongatissima, Brun. 17. nepalensis, Westw. .... 18. flavipes, Brun......... 19. bicolor, Macq. ...... ar 20. semilimpida, Bram. .... 21. tuberculifera, Edw. 22 allbonotnte, lute ae 23. testacea, Brun......... 24. cingulata, Brun. ...... 25. nigerrima, Bran. ...... 26. triangularis, Brun. .... MAT: Ge HEUEDNIP ELD ZEN 4) one oes 1. Rhyphus, Zatr...2.. Seis te 1. maculipennis, Walp .. 2. pulchricornis, Brun. .. 3. fenestralis, var. indicus, Bru. op siocie RO On 4. PUnetaous; Pi wn wee 6. distinetus, Brun. .....- G.cdivisls, aria oases 317. 372, 387. 389. 563. . In the reference to P. tergorata, for vol. ‘‘ viii” read “ vii . Plecia indica. For “ type” read “ types.” . To heading, Dixa ochrilineata, add (P1. XII, fig. 8). ERRATA AND ADDENDA. . Mycetophila griscolateralis is a Delopsis (p. 118). . The genotype of Sciara is S. (Tipula) thome, L. (Syst. Nat. Ed. xi, p. 976, 1767). : Line 20, from top. Relating to this species the text should read ‘ the two examples of this form, in the Indian Museum are distinguished ” ete. . Line 6, from bottom, This should read “ excepting the two females of longinervis, none of them ” ete. . Plecia fulvicollis, F. For metamorphoses, see Meijere, Tijd, Ent. liii, pp. 59-63, pl. iv, fig. 12. a) * D. montana, ay (C2 D.GUIS tite, ))p 5) D. maculipennis, ,, (Pl. XII, fig. 10.) a Ptychoptera tibialis, add (P1. VI, figs. 1-4). a P. atritarsis, add (Pl. VI, figs. 5, 6). . Ctenophora. The genotype is given by Coquillet as Tipula atrata, L., but this species is placed in Xiphura in the recent Palearctic Gatainene, so that the oldest species remaining in Ctenophora is pectinicornis, L., and this may be now regarded as the type species of the restricted genus. Tipula tessellatipennis ; in heading, for “ fig. 13” read “ fig. 12.” Dicranomyia absens ; in heading, for *‘ fig. 2” read “fig. 4.” Geranomyia, life-history ; for feeding habits, vide Knab, Proc. Ent. Soe. Wash. xii, pp. 61-65 (1910). Line 6, from bottom. Add “ eross-” before ‘ veins.” Line 14, from top. For “ fron” read “ from.” Orver DIPTERA. Apart from the males of the Coccrp#,. or scale-insects, the Diptera stand alone amongst the orders of Insects in the pecu- liarity of possessing only two wings, the hinder wings being represented by a small organ on each side of the thorax behind and below the wing-root, known as the halter. These halteres are invariably present in all the winged forms of the Order, and generally present also in the very few wingless ones. In rare cases the female only is wingless. The mouth-parts exhibit a wide diversity in structure, but they are nearly always in the shape of a proboscis, formed for sucking, or, in some groups, for piercing the skin of animals or man for the purpose of imbibing the blood. The antenne also show extreme range in form, but are valuable as one of the primary means of classification. The palpi have from one to five joints, the usual number in the NuMATocERA being four ; in the Bracnycura and the Muscrp#, two, of which the first is small and often more or less rudimentary. The wings exhibit a multiplicity of schemes of venation, all referable ultimately to a common general plan, and this latter character, the venation, perhaps affords the soundest basis for classifying the families, at any rate, so far as the perfect insects only are concerned. The larva in the Diptera is apodal, moving by means of small external transverse ridges or stiff bristly hairs, and progressing by a wriggling motion from side to side. In the vast majority of the species, the habitat of the larve (popularly known as “ orubs” or ‘maggots ”) is decomposing vegetable or animal matter, principally the former (the bulk of the higher Muscrpm and a large proportion of the AcaLyprrats Muscip#) ; a considerable number of species are root- or leaf-miners (ANTHOMYINA, TryperIn®)*; a further considerable number are aquatic (Cunicip#, CHIRONOMIDH, many TIPULID#, STRATIOMYIDE and ACALYPTRATA, some TABANIDA, and various genera in many other families); and a few are parasitic on mammals or birds (CistRIDa, Hirroroscrp#),t insects (CONoPIDS, etc.), spiders (CyRTID£), and other creatures. Some live in the earth (TaBaNnip#, ASILID2, Emp), a few are carnivorous (certain SyRPHID#); and one family forms galls (Cucipomyip#) : in short, the larve of Diptera as a whole exhibit the most varied methods of existence. * Some Indian Tryretin& live in rotten wood or in fruit. + Although in Hiprozoscrp# the larve develop in the body of the parent, the life of the imago is passed upon the body of its host. B 2 INTRODUCTION. The pupa is fixed or free; in the great division of the ORTHORRHAPHA it is mummy-like, that is to say, shewing more or less in outline the parts of the future imago, the shape of the head, antennze, wings, and legs often being conspicuous; in the second great division, the Cycrorrnapna, it is long egg-shaped, bearing no resemblance to the future insect, and exhibiting no parts whatever of the body in outline. In the perfect state (imago) Diptera are to be found practically everywhere and in every conceivable situation, a few species occurring even in very high latitudes and desert areas. A general introduction to the whole order of the Diptera is not contemplated in this volume, and the various parts of the insect are sufficiently well known to the majority of entomologists not to require more than a brief description. The following ex- planatory paragraphs on the external anatomy of a fly are there- fore curtailed as far as expedient. The genus T%ipula is selected as an example owing to its being the chief genus of the TrruLipa, the dominant family included in the present work. Fig. 1.—Diagram of a Tipula, to illustrate the parts of a Dipteron. Head :— m. Metanotum. f. Frons. mt. Metathorax. v. Vertex. h. Halteres. o. Occiput. Legs :— p. Tip of palpus. ec. Coxa, n. Neck. J. Femur. Thorax :-- t. Tibia. ec. Collare or prothorax. t.s. Tarsus (joints 1-5). ms. Mesosternum. Abdomen :— d. Dorsum (or mesonotum). 1-8. Abdominal segments. t.s. Transverse suture. g. Genitalia. s, Scutellum. EXTERNAL ANATOMY. 3 1. Exrernat ANATOMY OF A FLy. A. Terminology.* The Head. The upper part of the head lying between the eyes is known as the vertev, and an imaginary line dividing it from the back of the head, or occiput, is called the vertical margin. Sometimes a difference of colour clearly defines the limits of these areas, but more frequently such is not the case. The frons, or front, is the whole space between the eyes from the vertical margin to an imaginary transverse line above the base of the antenne. The vertex is really therefore simply the upper part of the frons, but it is often occupied by a somewhat conspicuous tubercle, or by a more or less triangular impressed space with rounded corners, in which are situated the three small simple eyes known as the ocelli, placed in a triangle, the apex of the latter pointing downwards, that is towards the antenne. These ocelli are in many families absent, in others reduced to two in number, and they may, in a few groups, be placed more or less in a straight line across the upper part of the frons. Those Diptera in the males of which the eyes touch each other in front for any considerable distance, are termed holoptic; those in which the eyes in both sexes are separated by a broad frons, are termed dichoptic. Although many cases occur in which it is difficult to decide in which category to enrol them, the vast majority of Diptera can be allotted at first sight to either the holoptic or dichoptic class. In holoptic Diptera, through the eyes not being contiguous absolutely the whole distance from the vertex to the antenna, there is always a small inverted triangle just above where the eyes meet, its apex pointing downwards, and this is called the vertical triangle. At the point where the eyes separate again, a little above the antenne, is another more or less triangular space with its apex pointing upwards, and this is called the frontal triangle. Obviously, in flies with the eyes wide apart, both triangles are merged in the frons and in such cases cannot be differentiated from it. Cyclorrhaphic Diptera technically possess what is known as the frontal suture, and the presence or absence of this suture is * This section defines the principal general terms in constant use; the more specialized ones are explained at more suitable places throughout the text, but all are, without exception, to be found in the Glossary. + The majority of the Bracuycera, except Asitinm and Doticuorrp®, speaking of the larger groups only, are holoptic, as are also the Calyptrate Muscip# as arule, and the Ruyeutp#, Breionip®, and some BLEPiwAROCERID® in the Nemarocnra. The remainder of the Nemarocera, with the AsiLip*, Doxicuorip” and Acalyptrate Muscip, are usually dichoptic, at least in the more extensive groups. 13} 4 INTRODUCTION. theoretically the only decisive character by which to distinguish members in the imago state, of the CycLorrHaPHa or ORTHO- RRHAPHA respectively ; but as three of the principal families do not possess the suture when they should theoretically do so, the value of the character from a practical point of view is very greatly diminished. This suture, when present (it is never found in the OrTHORRHAPHA), is a more or less oval, or most frequently crescent-shaped, narrow groove, sometimes reduced to an impressed line, and is situated immediately above the base of the antenna, and the small space it encloses is termed the frontal lunule. Through this space is thrust out during the pupal stage, the ptilinum, an inflatable organ by means of which the perfect insect springs off the cap of the pupa-case to enable it to emerge. Occasionally this ptilinum remains inflated in the perfect insect, as I have seen several specimens of Syrphus with it still blown out even in the dried insects. In many Cyclorrhaphic Diptera, especially among the higher Muscids, there is a well defined band, varying from a very narrow space to one of considerable width, on the inner or frontal side of the eyes, often slightly different in colour from the rest of the frons, not infrequently appearing brilliantly shining white when viewed from above or below. This is known as the frontal ocular orbit, or inner orbit; other margins of the eyes are spoken of as the facial (below the antennez) and posterior orbits respectively. These orbits are rarely present in the NEMATOCERA. Below the antennz, as far as the mouth, is the face, and posterior to the face below the eyes are the cheeks or gene. --'The epistome, or epistoma, is a slightly vague term, but strictly speaking it means the mouth-opening, and an indefinite space immediately contiguous thereto. It is probable that a good many authors have used the term to include the whole of the lower part of the head when not dealing with any particular part; in fact, I have used the term myself in this general sense when a very brief description sufficed for the whole of the underside of the head. Many groups of Diptera possess a system of bristles about the head as well as on the thorax, but since this does not occur in the Nematocera, the subject is not entered upon here.* The Thorax. The thorax in the Diptera is seldom divisible into the component parts—prothorax, mesothorax, and metathorax—but forms a uni- form oval, oblong, elongate, or sub-quadrate central piece in the front of which the prothorax is sometimes discernible, though in the NuMaToomrRA, especially in the TrpuLIDa, it is often obvious in the form of a circular flattened disc, termed by Osten Sacken the collare. The front part of the thorax when elongated to any appreciable extent is termed the neck, but in some families the head is too * See Glossary, Chetotary. EXTHRNAL ANATOMY. 5 closely applied to the thorax for this to be visible. In the average Dipteron, the head moves with great freedom upon the neck, and is capable of being turned in all directions. The metathorax is hardly distinguishable from the mesothorax, especially on the upper side. On the shoulders, that is, the anterior corners of the thorax, a slight swelling is often present, known as the humerus, or humeral callus or callosity. These humeral calli are frequently absent, and when present are very often differently coloured from the rest of the thorax. Other calli situated on various parts of the thorax bear significant names. The pre-alar callus is a small swelling in front of the wing-root, towards the side of the thoracic dorsum, which latter is generally spoken of as the mesonotum. The post- alar calli lie behind the wing; when they are on the hinder corners of the dorsum they are termed posterior calli. Sometimes I have used the term post-sutural calli in place of post-alar calli. Across the centre of the mesonotum in many Diptera is seen a more or less distinctly impressed line, often somewhat like a very widely opened V, faintest in the middle, and ending on each side a little in front of the base of the wings. This is the transverse suture, and it has a high morphological value, being very con- sistent when present. In the Nemarocera it is a strong character of the TrpuLipm (with one or two comparatively unimportant exceptions). Behind this suture (speaking now principally of T1puLID#) and between the slight swellings of the post-alar calli is a slight depression, which in the present work is referred to as the post-sutural depression. The presutural depression is a small depression at each end of the transverse suture, usually triangular in shape. The supra-alar groove is a groove on the mesothorax just above the wing-root, and in many species bristles of taxonomic import- ance are found along its inner margin. The scutellum is a projecting posterior lobe of the mesonotum, and a horny irregular ridge-like projection joining the scutellum on each side to the mesonotum is termed the scutellar ridge. It is sometimes, but not usually, conspicuous. Behind and below the scutellum is the metanotum, a smooth and more or less swollen part, attaining its maximum develop- ment in the Trputma#, in which it is usually much more conspicuous than the scutellum. The halteres, which in Diptera replace the posterior wings, are small delicate organs consisting of a narrow moderately long stem, ending in an oval club, which occasionally is flattened or spatulate. The sides of the thorax in many Diptera are distinctly sub- divided by impressed lines known as plewral sutures, whilst in others such demarcations are not perceptible ; when present they divide the sides into pleural spaces, which in some groups are well defined, whilst in others they are very indefinite. Most authors speak of them in general terms as “ the pleure.” These 6 INTRODUCTION. pleural divisions do not afford so many taxonomic characters in the Nematocrra as in some other groups, being always devoid of bristles, and it is these latter which are strongly indicative of affinities. Fig. 2.—Pleural divisions of the thorax of a fly. a. Prothorax or propleura. e. Pteropleura, b. Mesopleura, Jj. Hypopleura. ce. Metapleura. g. Plumula. d, Sternopleura, ps. Pleural or thoracic stigma. The three prinicipal sutures recognised generally are, (1) the dorsopleural suture (or notoplewral) running from the shoulder to the base of the wings and dividing the dorsum (or mesonotum) from the pleure as a whole; (2) the sternopleural suture, roughly speaking, parallel with the dorsopleural, placed about the middle of the body or alittle below it, and dividing the mesopleura from the sternopleura; and (3) the mesopleural suture, a more or less vertical irregular line from the base of the wings downwards, dividing the mesopleura from the pteropleura. The pleure themselves are distributed as follows :—The pro- pleura, or prothorax (generally termed the latter in the present work), is on the immediate anterior part of the thorax. The mesopleura lies behind it, in front of the wings, bounded above by the dorsopleural suture and below by the sternopleural suture. The metapleura lies immediately behind the wings, above and rather behind the pteropleura, which lies directly below the wings, extending downwards to between the two hinder pairs of legs. The hypopleura is a small piece below the metapleura and imme- diately over the hind coxe. The sternoplewra is usually the largest of all and lies below the sternopleural suture and extends down- wards, occupying all the space between the front and middle legs. The mesopleural suture therefore has the mesopleura and sterno- pleura in front of it and the pteropleura behind it. A small piece behind the metapleura is known as the plumula; and a small orifice on the prothorax just below the dorsum is the thoracic stigma. Since the NematoceraA are wholly eremochetous, that is to say, BPXTERNAL ANATOMY. ¥ devoid of strong bristles on the body (the Mvycrropninip® possess conspicuous and characteristic bristles on the /egs), it seems unnecessary to dilate here on the scheme of chetotaxy, or the systematic study of these appendages ; but a brief outline of the system is given in the Glossary under Chetotavy. The Abdomen. Few special terms are in use regarding the abdomen except that the external male genital organs are spoken of collectively as the hypopygium,* whilst the female organs are known as the ovzpositor. The eight segments of the abdomen are numbered from the base onwards, the usual terms used in the Tipunipm, where the covering of this part of the body is represented by a distinct dorsal and ventral plate, being tergum and sternum respectively.T The Legs. These also call for but little description, most of the terms being in common use. The acetabulum is a minute joint attaching the coxa to the body; the cowa is the short first obvious joint which is united to the femur, the first long conspicuous part of the legs, by another minute, ring-like piece, known as the trochanter. The tebia succeeds the femur and is the second conspicuous division, followed by the tarsus, or foot, which is invariably composed of five joints. These joints are numbered from the basal one, which is known either as the metatarsus, or the first tarsal joint. Care must be taken to note that the next joint following the metatarsus is the second. Attached to the extremity of the ultimate tarsal joint are the ungues, or claws, two curved hooks, and below these are two pad- like cushions or pulvilli.g These are often absent in the OrTHO- RRHAPHA. Between the claws, and below them, attached, like the pulvilli, to the last tarsal joint, is the empodiwm, which sometimes takes the shape of another pad, in which case it is said to be pulvilliform, and sometimes that of a thick bristle or spine. Osten Sacken placed much reliance on it as a classificatory character in Treuttp#, but I am inclined to doubt its value to such an nay ee ne Se ee * Bergroth has proposed propygiwm, but hypopygium is universally adopted by dipterologists, whenever a special term is used. + Westhoff terms the upper and lower sides of the 8th segment the lamella basalis supera and infera, respectively, and those of the 9th segment or the one actually developed into the genital organs, the lamella terminalis supera and infera, respectively, but I know of no one who has adopted these unwieldy names, t The exceptions are very few and only amongst abnormal forms. § Too much importance should not be given to minor differences, such as the comparative size, toothed nature, and so on, of the ungues, presence or absence of empodia, ete. When Theobald’s first volume on the Cunicrp& of the world was published, great stress was laid on very microscopic differences in the shape and size of the different pairs of claws, and in my Catalogue of Oriental Cuuicip#& the great importance of these characters was questioned. In sub- sequent volumes of Theobald’s work it was admitted that they did not possess the value at first accorded to them. 8 INTRODUCTION. extent. Often it is absent, and occasionally it is present when the pulvilli themselves are wanting. The anterior legs are the four front legs taken together, the posterior legs the four hind legs similarly considered. When spoken of singly they are called the fore (front or first) pair ; middle (median or second) pair; and the hind (or third) pair. Fig. 3.—Wing of Limnophila. c, costal vein. ce, costal cell. a, auxiliary vein. sc.c, subcostal cell. 1, 1st longitudinal vein. mc, marginal cell (inner and outer). 2, 2nd do. 1 sm.c, 1st submarginal cell. 3, 3rd do. 2sm.c, 2nd submarginal cell. 4, 4th do. 1 pe, 1st posterior cell. 5, 5th do. 2 pe, 2nd do. 6, 6th do. 3 pe, drd do. 7, Tth do. 4 pe, 4th do. he, humeral cross-vein. 5 pe, Sth do. sc.v, subcostal cross-vein. an.c, anal cell. mz, marginal cross-vein. 1 ax.c, 1st axillary cell. ax, anterior cross-vein. 2 axr.c, 2nd do. px, posterior cross-vein, de, discal cell. pf, preefureca. 1 de, 1st basal cell. 2 be, 2nd do. The Wings. The Veins—As a typical wing from which to illustrate the venation,* having special reference to the NemMarocera, that of Lamnophila has been chosen.t The front margin of the wing is known as the costa, and is * The term neuration was employed by many of the older authors instead of venation, but the latter is at present in almost universal use. + It must be understood that a diagrammatic wing to expound the whole theory of venation throughout the Diptera is an impossibility, and the wing of Limnophila is selected because it possesses the greatest number of cells and veins in the Nemarocera, The relative lengths and positions of these are given in the main as for Limnophila, but it must be understood that these propor- tions vary in different groups and to a still greater extent in different families. The student should be able, after mastering the terminology of one family, to identify the corresponding veins in others, and to recognise which are present and which are absent or modified. EXTERNAL ANATOMY. 9 carried right round the wing uninterruptedly, without any distinct or sudden termination near or just beyond the tip, as in some families of NEMATOCERA. The auacliary vein is the first vein below the costa, and generally ends, in the T1pULIDm, between the middle (or just before the middle) and about three-fourths the length of the wing. It is connected with the costa quite near its base by a short upright cross-vein, the latter known as the humeral cross-vein. The auxiliary vein is often known as the subcostal, which is perhaps a better name, but since in studying T1ruLip# the works of Osten Sacken must be consulted, his name for this vein is adopted in preference. The next vein is a much longer one, running parallel with the auxiliary vein and ending some little distance beyond it; this is the lst longitudinal vein. It either turns up rather suddenly at the tip into the costa, as is generally the case in the LimNnosrina, or turns distinctly down at the tip into the 2nd longitudinal vein, as is usually the case in the Trpuninm®. In some few cases it fades away at the tip without turning either up or down. The auxiliary vein often lies so closely in front of the 1st longitudinal vein as to be imperceptible unless carefully looked for. In some few genera these two veins are actually united (Voworhina, Styrin- gomyia), and in these cases the Ist longitudinal vein, as the united veins are invariably called, generally approximates gradually to the costa, finally becoming merged in it, and not turning dis- tinetly up or down at the tip as in the typical forms. The auxiliary vein and the Ist longitudinal are, in the T1puLipa, nearly always connected by a short cross-vein known as the sub- costal cross-vein, which is most frequently situated towards the end of the auxiliary vein, but sometimes occurs a little before or after the origin of the 2nd longitudinal vein. Considerable importance attaches not only to the actual length of the auxiliary vein, but to the relative position of the subcostal cross-vein, although exceptions occur, even in otherwise closely allied genera (in the Er1oPTERINt, for instance). The 2nd longitudinal vein emerges from the first, usually some- where near the middle of the latter, sometimes in a straight line at a more or less acute angle, but more often in a gentle or distinct curve. When the 2nd longitudinal vein is ‘ simple” (that is to say, pot forked) there is only one submarginal cell ; * when the 2nd vein is forked there are two, and this character is of paramount importance, being the very first one employed in separating the subfamilies; and on it depends the terminology of many oi the cells.t The portion or section of the 2nd * Vide p. 13 for description of ceils. + The principal exception in Oriental genera is Gonomyia, in which some species have but one whilst others have two submarginal cells. This instability is very exceptional as a generic character (Gonomvyia). 10 INTRODUCTION. longitudinal vein * between its origin and the point of forking is called the prefurca; the two branches, after forking, are the “anterior and posterior,” the “upper and lower,” or the “ fore (or front) and hind,” respectively.t It may be noted here that Mr. Verrall uses the term prefurca for the “common origin” of the 2nd and 3rd longitudinal veins, that is to say it terminates at the origin of the 3rd vein, but it is adopted in the present work in Osten Sacken’s sense, comprising the whole of the 2nd vein as far as the fork. The section of the prefurea between the origin of the 3rd vein and the fork of the 2nd is often referred to as the petiole of the 1st submarginal cell. Naturally this only applies when the 2nd vein is forked, as otherwise there is only one submarginal cell. The marginal cross-vein is placed near the tip of the 1st longi- tudinal vein, joining it to the 2nd vein and dividing the marginal cell into two parts, often into about equal halves, these being known as the inner and outer marginal cell respectively. When the 2nd vein is forked this cross-vein may unite with the upper branch or with the prefurca, and it has a tendency to indistinctness in many species. It is present in the large majority of genera in TrpuLIp®, but is absent in some (Atarba, Toxorhina, Rhamphidia, ete.); it is indistinct in Limnophila, present in Ptychoptera and the Trputin x, whilst in the CyLrypROroMINT it is replaced by a small and often indistinct cross-vein between the Ist longitudinal vein and the costa. The value of its presence or absence has been oyer-estimated by one or two authors, although it can usually be accepted as a good character. The 3rd longitudinal vein emerges trom the prifurca in nearly all the T1puLipm®,t and the preefurca itself is often bent downwards at a more or less distinct angle at the point of contact. The 3rd vein is simple in all the Oriental genera, except in the subfamily PrYCHOPTERIN®, in which its forked nature constitutes one of the principal characteristics of the group. It is nearly always present, any genus without it being most abnormal. In Towo- rhina it is altogether absent, the anterior cross-vein connecting the 2nd and 4th longitudinal veins; in Mongomea (according to my interpretation of the venation) it is reduced to a short longi- tudinal connecting vein between the middle of the praefurca and the 4th longitudinal, thus not even approaching the margin of * Tt will be understood that the abbreviation “1st vein,” “ 2nd vein,” ‘‘ 3rd longitudinal,” and so on, in all instances means the Ist longitudinal vein, 2nd longitudinal vein, 3rd longitudinal vein, ete. t+ When once the principle is thoroughly understood that it is the second longitudinal vein which forks in Trruni™m (and hardly ever the third), it is not of great consequence what may be the exact terms used; nor is there any unanimity in the matter. In company with other authors I use all the terms quoted indiscriminately. { The principal exception is Amalopis, in which it emerges either from the posterior branch of the 2nd vein or from the prifurca, according to the species, EXTERNAL ANATOMY. 11 the wing.* In Ptychoptera, the principal genus of the subfamily PrycHoPTERIN®, the 3rd vein issues from the prefurca at a point where that vein makes such a sharp angle that the general appearance is that of two long veins crossing one another nearly at right angles,t the first being composed of the basal section of the 2nd vein and the 3rd vein; the 2nd vein being com- posed of the anterior cross-vein and the remaining section of the preefurca. The next vein is probably the most important of all in the wing: this is a short cross-vein which almost invariably through- out the Order connects the 3rd and 4th veins when both are present ; and this vein, the anterior cross-vein,t is, in conjunction with the discal cell, technically, a key to the venation in the whole order of Diptera.§ It divides the wing longitudinally into two nearly equal halves, and no vein found in front of it in one group is ever found behind it in another. When the discal cell is present the anterior cross-vein is placed immediately above it {in TrpuLip®), usually, at or near the base of the cell, rarely beyond it (Conosia). When the discal cell is absent this cross-vein unites the 3rd longitudinal vein to that part of the 4th vein which would have formed the anterior side of the cell, had it been present. In the Numatocera it can nearly always be employed as a central vein around which to recognise the adjacent veins; and a little practice and comparative study of the wings of other families will enable the student to determine it with tolerable accuracy. It is usually more or less upright, generally short, sometimes very short, more rarely moderately long; being wholly absent in only a very limited number of quite abnormal genera of TrPULID.|| Having recognised the anterior cross-vein, joining the 5rd and 4th longitudinal veins, it is easy to find the 2nd longitudinal! vein and to ascertain, according as that vein be simple or forked, whether there are one or two submarginal cells. The cell on the inner side of the anterior cross-vein is the Ist basal cell, the cell on its outer side is the lst posterior cell. This rule is practically inviolate, not only in the TreuLip#, but in all families of Diptera with a tolerably complete venation. The 4th longitudinal vein begins at the base of the wing, and invariably encloses, or rather constructs, the discal cell (when * This is the only instance I know of showing this abnormality, and it is just possible that the vein might be more correctly regarded as the anterior cross-vein, This, however, is doubtful—vide discussion under Mongonva. +t Note Ptychoptera in the comparative figures of wings. { Also known as the “small cross-vein,” and the ‘internal transverse vein.” § This must not be taken too literally, as exceptions embracing whole families occur, such as the Cecipomyip®, SImvnimp#, and outside of the Nemarocera, the Puorip4, ete., but all thése exceptions are instances of incomplete or aberrant venation. || The only such Oriental genus is Mongoma. 12 INTRODUCTION. this is present) by being, in these cases, always forked, the absence of the discal cell being only caused through the absence of a short cross-vein between the two main branches of the 4th vein, and this cross-vein is usually called the discal cross-vein, on account of its dominating the discal cell. It will be seen that the 4th longitudinal vein forks at the discal cell,* its upper or anterior branch forming the basal and anterior sides of this cell; the lower or posterior branch forming the posterior and outer sides of the cell. Apparently, the outer or distal side of the discal cell is formed in most genera of TrpuLip% by two short veins, both nearly straight themselves, yet not often in a straight line with one another. The upper one of these short veins is my discal cross- vein, the lower one is considered part of the lower branch of the 4th vein, the straight continuation of the basal part of the 4th vein being regarded as a branch vein known as Loew’s posterior intercalary vein. The upper branch of the 4th vein, after quitting the discal cell, forks again, the upper prong being considered as the continuation of the vein itself, the lower prong the branch vein, and this latter is known as Loew’s anterior intercalary vein.T When the anterior or upper branch of the 4th vein is forked, the section between the discal cell and the fork is known as the petiole of the 2nd posterior cell. -In the same manner, in a case where there is no discal cell and the posterior branch of the 4th vein is forked, it would be correct to speak of the corresponding section of that branch as the “petiole” of that posterior cell which was contained by the fork. Somewhere beyond the middle of the 4th longitudinal vein is a longer cross-vein, generally more or less obliquely placed. This is the postericr cross-vein, which in T1euLIDm invariably connects the 4th and 5th veins, and is practically always straight itself, * Slightly but distinctly before it in Megistocera, the ouly exception known to me. } It seems to me that although the lower prong of the upper branch of the 4th vein is really the additional veinlet due to the forking, a mistake has been made by even Loew, one of the soundest of dipterologists, in regarding the upper prong of the lower branch of the 4th vein as the true continuation of that branch, since, when this lower branch is not forked it never takes the course containing two sharp angles but continues in a more or less straight line to the wing-margin. This compels me to believe that the /ower prong is the true continuation of the lower branch of the 4th yein, and that the upper prong is the additional veinlet due to the forking and that this upper prong should have been named the posterior intercalary vein by Loew. I have not seen this view suggested anywhere, but unless it be admitted, the anomaly would be presented of the lower branch, when forked, taking two abrupt angles, but when simple, proceeding in a straight line to the wing-margin, a curious and quite illogical theory. This view applies to the Limyosim only, as in the Tirvtinx, in which the lower branch is always forked, the lower prong appeals irresistibly to me as the additional veinlet, and the upper one (forming part of the discal cell and being much less angulated) as the true continuation of the lower branch. There seems nothing illogical in the assumption that an additional veinlet may occur on either side of a parent yein as a subfamily character. EXTERNAL ANATOMY, 1133 e though placed at various angles to the two veins it connects. Occasionally (in Mongoma, for instance) the 5th vein bends down at the tip, meeting the 6th vein and thus closing the anai cell, instead of running to the margin of the wing as in most genera. The 5th longitudinal vein, with the 4th, the 6th, and 7th all spring from the base of the wing. The 6th longitudinal vein lies posterior to the 5th and is normally straight or only gently curved;* the 7th longitudinal, being the last vein, usually parallel, or approximately so, to the length of the wing. In TrrevLip#, the 5th, 6th, and 7th veins are never forked. The 7th vein varies in length and direction; in the Prycuoprn- RINZ it is comparatively short, taking a distinct downward curve at the tip to meet the wing-margin. In TZ'richocera the same thing occurs, only the vein is much shorter still, so short as to be easily overlooked altogether. In other genera, Mongoma for instance, the 7th vein, though much shortened, is only gently curved. The term central cross-veins was sometimes used by Osten Sacken to designate the veins between the end of the prefurca (transversely across the wing’s length) and the posterior cross- vein; in this case the short basal section of the 3rd vein, the basal part of the fork of the 4th and both sides of the diseal cell would be included in addition to the two cross-veins proper. Not infrequently a genus or species is distinguished by the presence of an extra vein which is constant in its occurrence. Such veins are called supernumerary. When they occur abnormally in individual specimens (often in one wing only) they are called adventitious, and such occurrences are quite frequent, especially in the Ertoprurint, in which their unexpected presence causes much difficulty to the beginner. The Cells.—The recognition of the cells, once the terminology of the veins is mastered, is comparatively easy. The first, immediately below the costa, and bounded pos- -teriorly by the auxiliary vein, is the costal cell; that between the auxiliary vein and the Ist longitudinal vein (often difficult to perceive on account of these two veins lying so close to one another) is the subcostal cell. In cases where the auxiliary vein and the Ist longitudinal vein are united (ovorhina, Styringomyia) the subcostal cell is of course absent. The 2nd longitudinal vein always has in front of it the marginal cell, When the 2nd vein is simple the ce!l immediately behind it is the submarginal, but when the 2nd vein is forked there are two such cells, in which case they are called the 1st and 2nd * Absent altogether in Prycnoprmrin™. + This is rather a vague definition, but so many species have clear wings except for slight infuscations on all the veins or portions of veins that lie transverse to the wing’s length, that most authors have adopted it for descrip- tions of certain species at some time or other, myself included. The term should in any case be used with caution. 14 INTRODUCTION. submarginal cells respectively.* Care must be taken in those genera (Gonomyia, Mongoma, etc.) in which the fork of the 2nd longitudinal vein is short and nearly perpendicular, giving it the appearance of a cross-vein, for which it might easily be mistaken. When the marginal cell is divided by the marginal cross-vein, as is the case with most genera of TrpuLID®, the divisions of the cell are known as the inner and outer marginal cells respectively, but when speaking of the united cells the term ‘“ marginal cell ” is correct. It will thus be seen that the 3rd vein has in front of it the submarginal cell, if the 2nd longitudinal vein be simple, and the 2nd submarginal cell, if the 2nd vein be forked. Immediately below the 3rd vein is the anterior cross-vein, the key to the whole venation. This vein always joins the 3rd and 4th longitudinal veins, exceptions being very rare (Amalopis), and it always meets the 4th vein at the discal cell (usually at the anterior upper corner of the latter), when this cell is present. However, whether the discal cell be present or not, the anterior cross-vein meets the 4th vein exactly or very nearly at the same place. Thus the discal cell in the vast majority of Treunip# has the 1st posterior cell in front of it, and (except in Trputinz) the ultimate posterior cell (4th or 5th, etc., as may be) behind it.t The anterior cross-vein always bounds on its inner side the 1st basal cell, below (or posterior to) which latter is the 2nd basal cell, of varying relative length but always conspicuously longer in TrpuLip# than in most families of Diptera. Behind, or posterior to, the 1st posterior cell the other posterior cells run on in numerical order, four being the usual number in this family, less frequently five (Limnophila, Oladura, some Eriocera) ; occasionally only three (Bittacomorpha, a non-Oriental genus), the last posterior cell being that one of which the posterior cross-vein forms the base. Posterior to the 5th longitudinal vein is the anal cell, open in * In the case of Ptychoptera, where the unusual eyent of the 3rd longi- tudinal vein forking instead of the 2nd is found, the same rule as to the nomenclature of the cells holds good; thus the Ist submarginal cell is bounded by the 2nd vein and the upper branch of the 5rd vein, whilst the 2nd sub- marginal cell is bounded by both the branches of the 3rd vein. One or two authors have contended that it would be more correct, when the 2nd vein is forked and the 3rd vein simple, to regard the cells as two marginal and one submarginal ; and when the 2nd vem is simple and the 3rd forked, as one marginal and two submarginal ; that is to say, all cells bounded posteriorly by the 2nd vein would be called marginal cells, and those bounded posteriorly by the 3rd vein, submarginal cells, in each case irrespective of their number. In the conceivable case of both 2nd and 3rd veins being forked, there would be two marginal and two submarginal cells. + The: only exception in T1ruLipa amongst Oriental genera is Conosia, Wied., in which the anterior cross-vein is placed very distinctly beyond the discal cell. { Of course, when the posterior cross-vein is placed so far distally as to be beyond the limits of the discal cell, the latter is bounded posteriorly by the 2nd basal cell. It invariably has the Ist basal cell on its inner side. In the Tiputina the penultimate, not the ultimate, posterior cell bounds the discal cell posteriorly, on account of the lower branch of the 4th longitudinal vein forking just at the lower basal corner of the discal cell. EXTERNAL ANATOMY. iE the great majority of genera in TreuLip%, but occasionally closed (Mongoma) by the turning down of the 5th vein at its tip, meeting the 6th vein before the border of the wing. When open, therefore, it runs the whole length of the wing from the base to the wing-margin. Posterior to “the 6th vein is the axillary cell, In Treuntm#, in which the 7th vein is nearly always complete, that is to say, attains the margin of the wing, there is of course yet another cell—the last—in the hind angle of the wing. In those families of Diptera which have the 7th vein incomplete, all the space between the 6th vein and the hinder angle of the wing is considered the axillary cell (called by some of the older authors the ‘ spurious ” cell, presumably on account of its ill-defined nature). Some authors speak of a lst and 2nd anal cell, plus an axillary cell. Where there has been occasion to mention this ultimate cell specially as such, it is herein called the 2nd avillar y cell, thus retaining only one anal cell in the wing.* Wing pubescence.—A note may be made here regarding the terms “‘ wings bare” or wings pubescent” in this family. It is probable that under very high microscopic power every wing will be seen to possess extremely minute stiff hairs, but when such are wholly invisible to the naked eye or to an ordinary entomo- logical hand-lens, the wing is considered bare, or, as some authors have termed it, glabrous; and generally it is more or less iridescent. These microscopic sete are therefore never regarded as pubescence. When the naked eye or a hand-lens reveals distinct hairs on the veins or on the surface of the wing itself, the wing is considered pubescent. Practically all the veins bear microscopic short stiff hairs, but if these are not clearly seen without a microscope, the veins are not termed pubescent or bristly, Fig. 4.—The basal portion of a fly’s wing. a, axillary lobe; %, alula; c, antitegula; d, tegula. The alule, tegule (or syuame), and halteres.—The basal corner of the hind margin of the wing is often well developed, at times forming quite a projecting angle, and this part is known as the * In the case of Ptychuptera, the 6th longitudinal vein being absent, there are only two cells altogether between the 5th vein and the hind angle of the wing, namely the anal and axillary cells. 16 INTRODUCTION. axillary lobe. Behind this is an indentation of the wing-margin called the awillary incision, and beyond this again (working towards the base of the wing), is a small, more or less well developed continuation of the wing--the alula. In some wings, such as those of cuneiform shape, the axillary lobe is, perforce, absent, and the alula is reduced toa minimum. Behind the alula are two more or less rounded, scale-like organs, generally of a dirty white colour, and frequently with a fringe of hairs on the edges; these are the squame, and they have given rise to con- siderable dispute as to their correct names. When the wings are folded, the upper one, which is nearly always the smaller of the two, partly covers the lower one, and when the wings are out- stretched the upper one moves forward, being actually the extreme base of the wing, and the lower one, then fully disclosed, is seen to be definitely fixed to the thorax. The term tegule appears to date from Loew, in 1844,* when he distinctly differentiated it from the alula (the final basal lobe of the wing), and it is applied to the squama which is fixed to the thorax. Osten Sacken invented antitegula for the anterior scale, to which at times it was necessary to refer specially, and he gives a clear resumé of the various terms used for these parts in a short paper.t He also suggests as alternative names to antitegula and tegula, antisquama and sgywama, when speaking of each separately, or simply squame (in the plural), if both pairs together be referred to. Inthe present work the two pairs, anterior and posterior, taken together are sometimes described as the sqgwame and some- times as the tegule.t Since, in the Nsematocera the thoracic squama is very rudimentary, there have been few occasions to refer specially to either the anterior or posterior pair. Jonfusion has frequently arisen owing to many authors. calling these structures the alule; and a recent writer, Comstock, still adheres to this view, contending that the term tegula should not be employed, having been preoccupied for the cup-like scale above the root of the wings in some Hymenoptera. A great number of terms have been applied to both the alule and the squame, espe- cially the latter, but no advantage would ensue by discussing them here.§ Verrall uses the names alar and thoracic squame, and perhaps these are the most suitable of all. As for the halteres or aborted hind wings, they are in some way connected with the power of flight, since if they are removed, a Dipteron flies erratically. They are short cylindrical stems, bearing an oval or flattened knob or club at the tip, and are placed behind and a little below the roots of the wings. The insect can vibrate them with great rapidity in the same manner as a wing. * Stettin Ent. Zeit. 1844, p. 326, footnote. + Berlin. Ent. Zeit. xli, 1896, p. 285. Tam not at all certain that in my earlier writings I have not used the term alule to designate the zegule. § Amongst the terms used for the squame are calyptre, alulets, winglets, auricles, ailerons, cuillerons. EXTBRNAL ANATOMY. LLY, B. Descriptive .* The Head. The eyes.—With the exception of some of the EprososcrpEa (PurrparA), the large compound eyes so strikingly prominent in most species of Diptera, are invariably present. In the majority of the NumMaTocera the eyes are separated by a frons, or front, of equal width in the two sexes, but in most of the families of the Bracny- crra (except the Astrinm and DoricHorip#), and in the great majority of the higher Calyptrate Muscipm the eyes in the male touch each other in front for a considerable distance. Exceptions occur in some BLEPHAROCERID®, in which the head is holoptic in one or both sexes, or dichoptic in both; also in the Cyrripa, in which the eyes are contiguous in both sexes both above and below. Asarule the eyes are always well separated on the under- side of the head, but in many TrpuLip% they are there contiguous or subcontiguous. In most families they are oval or semicircular ; in some, enormously enlarged, occupying practically all the head (Cyrtip», PreuncuLip®); in others, kidney-shaped (PsycHo- pIDZ and many groups of MycrropHitip®). They may be thickly or lightly pubescent, or bare, these features being often not contingent on sex. Ina few families they possess coloured bands in life (TABANID®, some AsILtp#), which fade after death, but which may generally be caused to reappear by an application of damp sand. In the genus Bibio the male eye is curiously divided into two parts, and in most BLepHAaRocuRIDs# the eye, at least in the male, is sharply divided into an upper and lower part, the facets in one being very large, and in the other much smaller, and the two parts being separated by a narrow unfacetted band. In one small family of Acalyptrate Muscrp#, the Diop- stnm, the head is produced on each side into long eye-stalks, at the tips of which are placed the eyes. In some wingless PHoRIDz the eyes are somewhat aborted. The ocelli or simple eyes have been sufficiently described under the heading “ Terminology.” The mouth-parts.—“ No point of insect morphology has given rise to more differences of opinion than the mouth of Diptera.” (Dr. Sharp, 1899.) This being supported by the existence of so many views as to the homologies of the dipterous mouth-parts, the present references may be judiciously curtailed. Of the various authors perused, I venture to select Williston’s definition of these parts as being the most concise and recent (1908). This author is therefore quoted verbatim :— «The more commonly accepted homologies of the mouth-parts are as follows: labium, maxille, maxillary palpi, mandibles, Dene Eee * The notes comprised under this heading are of the briefest, since a veneral introduction to the order of Diptera is not attempted in this volume, and the characters of the families treated of herein are fully detailed in their respective places. C 18 INTRODUCTION. hypopharynx, and labrum or labrum-epipharynx. The labial palpi are thought to be wholly wanting or represented by the labella.* The labium is always present, more or less fleshy and provided with muscles. It is grooved or channeled on the upper side to receive the other parts, with the exception of the maxillary palpi, which are free. This sheath is often nearly complete, the thin margins touching each other above. At its tip are the pair of joints of variable size called the lips or labella. The maxille and mandibles are sometimes absent, the mandibles most fre- quently ; when present they are always slender and firm. The hypopharynx is unpaired and slender, grooved on the upperside and sometimes converted into a nearly complete tube. The labrum, also unpaired, is usually elongate and grooved on the underside, forming by apposition with the hypopharynx a com- plete tube. The mandibles are frequently absent; in fact, [ do not know of their occurrence in any flies with a simple third antennal joint, and they may be absent in the male when present in the female, as in the Tasanipm. They are always piercing- organs, thin, firm, chitinous, and usually slender. The two maxille, likewise piercing-organs, find their highest development in such predaceous flies as the Asttipm. Like the mandibles they are chitinous and slender. In some they are more or less flat- tened, and may have curiously shaped projections at the tip; usually they are bristle-lke. They he with the maxille within the sheath of the labium, at either side of the labrum and hypo- pharynx. In some cases the labrum is short, and serves only as a cover for the proximal part of the hypopharynx, but usually it is as long as, or longer than, the hypopharynx, and has a simple groove on the underside. The hypopharynx is always present in flies in which the mouth-parts are functional. It is, more often, a slender firm organ, grooved upon the upperside, which by apposition with the labrum forms a distinct tube. In some, however, it may form an almost complete tube in itself.” ¢ The mouth in the Cunicip® may be described as consisting of eight pieces of approximately equal length, the labium being slightly longer than the others.t The labrum, or upper lip, is uppermost, and closely united to it on the underside is an equally long but very slender piece known as the epipharynx.f Two slender lancet-like pieces come next: these are the mandibles, and below these, two ‘‘ delicate needle-like organs, barbed at the summit, the maxille.” There is alsoa “thin tubular thread,” the so-called hypopharynx, this being connected with a poison gland at its base. Below these is the stoutest piece of all, the labium or lower lip, grooved on its upperside to admit of the reception of all * This has been recently contested by Wesché. + This description is after Theobald (Monog. Culic. i, p. 3). + Theobald recommends abolishing this term, as this piece is really part of the labrum, but there are occasions when, exact reference to it being required, a special term is necessary. . EXTBHRNAL ANATOMY. 19 the other pieces except the labrum, which covers them like a sheath from above. At the tip of the labium are two small oval lamellz in the form of two spatulate jointed valves, and these represent the labial palpi. “During the act of piercing the skin, all the mouth-parts but the lower lip (labium) are inserted ; the labium bends and guides the other mouth-parts into the skin, The blood is drawn up the upper lip, the tube being formed by the upper lip, and closed below by the hypopharynx.” Meinert wrote, in 1881, a copious anatomical essay on the mouth-parts of the Diptera, presumably in Danish,* but his views on many points are very original and not corroborated by the examinations of other writers. He employs also a terminology entirely his own. The palpi.—For purposes of classification the most important organs appertaining to the mouth? are the maxillary palpi, usually spoken of simply as the palpi, as the labial palpi are considered to be represented by the labella; some authors do not agree with this view and think that the labial palpi are entirely absent in this order: Wesché, in fact, has in recent times contested that either maxillary or labial palpi may be present and functional, but no cases are known of both pairs being functionally present. The palpi in the vast majority of Diptera are either long and composed of four joints, as is the case with the great bulk of the NEMATOCERA, or quite short and composed of two joints, the first being very small, as is the case in the bulk of the remaining families. Occasionally a 5th joint is evidently present, though its existence has been generally denied till quite recently ; in these cases the conical protuberance of the proboscis, upon which the palpi are in many instances inserted, is sufficiently differ- entiated to form a distinct basal joint, but such instances are not common. In two or three Oriental species of Phlebotomus this basal joint is present. It seems hardly necessary to note that the joints are counted from the base outwards, so that in a 2-, 4-, or 5-jointed palpus the last or terminal joint is the 2nd, 4th, or 5th respectively. In size, shape, and relative length of the joints they exhibit great diversity, a considerable amount of variation being found in the same genus, frequently a single joint being enormously enlarged, or peculiarly formed. Generally situated at or very near the base of the proboscis, the palpi are in rare instances placed at its middle (Geranomyia), or tip (Hlephantomyia) ; in these cases the proboscis is very con- spicuously elongated. Williston says “the tendency in Diptera * T have not seen the work. It is called ‘ Fluernes munddele,’ 91 pp., 6 pl. Stockholm, 1881. t In the description of the mouth-parts I am much indebted to Prof, Wil- liston’s admirable manual on North American Diptera (3rd Ed.), and most of the quoted passages are from that work. o2 20 INTRODUCTION. is towards their entire loss, and in the more highly specialized families there is never more than one joint.” At the tip of the proboscis, or very near it, isa pair of larger or smaller organs, generally distinctly visible, and more or less oval in shape, known as the labella or lips. Their function varies considerably, in some groups representing merely an apparatus for holding, in others they are evidently sense-organs, being ‘ pro- vided with hairs inserted in small semi-translucent: spots on the outer sides and margins.” This is the case in most flower- haunting flies, SyrpHip# for example. In the majority of Diptera the labella are of fair or considerable size, and are provided with radiating ridges on the inner opposable sides. These pseudotrachee, as they are called, “serve as a means of attrition, by which the insect rubs off particles of food from firm substances.” In at least one family, the As1u1p®, they are rigid and horny. ‘‘ Some- times the labella are long and slender, and are folded back under — the labium when at rest.” The mouth-parts in some Diptera are quite rudimentary, attain- ing their most abortive state in the CEsrrip#, in which they are almost absent. The antenne.—These organs exhibit a wider range of variability than any other in the Diptera, and to the beginner offer many puzzles, although a moderate amount of study will enable one to discriminate between the nematocerous, brachycerous, and muscid types, of which the latter is somewhat quickly recognised, although sume Syrphid antenne may easily be confused with it at first sight. As a means of classification the antenne have always been regarded as furnishing one of the most fundamental characters. It is significant that so long ago as 1802, when Latreille made the first real attempt at classification by dividing the Diptera according to the palpal and antennal characters, the long filiform nature of the many-jointed antennez, combined with the elongate four- or five-jointed palpi, was seen to be typical of the Nemarocnra (this term being introduced by Latreille in 1817); whilst the short three-jointed antenne, coupled with the one- or two-jointed short palpi, of the rest of the Diptera were acknowledged as the charac- teristics of the Bracuycmra, the latter term having been pro- posed by Macquart in 1825. The valuable systematic characters contained in the venation did not occur to dipterologists until years afterwards. In the Nematocera the antenne are always more or less elon- gate,* often conspicuously so, composed normally of eight to sixteen distinct joints; in a few cases, as in some males of species of Eriocera in Treunip®, of six joints only; and in some other instances, of as many as twenty-eight: in fact some authors have * Wi ; : With the exception of Orpunerntips«, a group of only five species representing a single and altogether anomalous genus. EXTERNAL ANATOMY, A claimed thirty-nine in a particular genus of Cuctpomy1pm (Cero- zodia), hut this has been disputed on the grounds that some of the joints are merely annular impressions. Lhachicerus (Luprip®) has twenty-eight joints, and some genera of CacipoMy1D# possess this number also. The antenne in the Bracuycura consist technically of only three joints, but in some genera (Hewatoma in Tapanip”, Xylo- phagus and Ihachicerus in Luprip®) the 3rd joint is either dis- tinctly or apparently divided into several joints, so that at first sight it is not easy for a beginner to distinguish the location of a species by the antenne alone. But in all such cases the very short palpi and the totally different scheme of venation afford a certain clue to their identity. In the Nemarocura the two basal joints are almost invariably differentiated from the rest, and are known as the scape or scapus, the remaining joints being called the flagellum. The scape nearly always bears a few stiff bristles, either irregularly placed, or arranged in one or two more or less distinct rows near the apical margins ; it is sometimes bare or practically so, but never verti- cillate. The flagelluu in most of the Trputtp# and in some other groups, bears a whorl of fine hairs symmetrically arranged (in the TIPULIDm a very common number is four, two above and two below, the upper ones often the longer) around each joint, and the autenne are then spoken of as verticillate. This is the normal form of antenna in the Trputip®. A few genera in that family have pectinate antenne in the male, that of the female being verticillate or much less conspicuously pectinate. The CHIRONOMID# and CuLic1p# normally possess excessively plumose antenne in the males, those of the females being generally verti- cillate, whilst CectpoMy1p# generally possess verticillate antenne in both sexes. In the CycborRHAPHA only three joints are present, of which the first is always short, often extremely so, the third frequently being annulated, or possessed of a number of finely impressed lines giving the appearance of a number of joints closely annealed. It is curious that in these latter cases the 3rd joint never possesses more than seven such annular impressions, thus suggesting eight annealed joints, because the nematocerous antenne most likely to be confused with such a form are those like Bibio, Plecia, ete., in which the flagellum generally consists of eight subequal homologous joints (though perfectly distinct from one another), whilst the two basal or scapal joints have some considerable resemblance to the first two joints of the antenna in Xylophagus. It is this latter form, which is by no means infrequent, that may be mis- taken by the beginner for an eight-jointed nematocerous antenna. However, in all such doubtful cases the structure of the palpi and the distinctly different venation immediately decide the question of affinity. With the Cyclorrhaphic antenna we have little to do in this volume, but it may be stated that although it consists of three 22 INTRODUCTION. joints only, the terminal joint takes the most varied and at times extraordinary shapes, and may be elongate and porrect as in Ceria (Syrpuip#), elongate and pendant as in the higher Muscrp», short and rounded as in most of the ANTHOMYID® and AcALYP- TRATA. It may be furnished with an arista, along, gently curved, bristle-like hair, which may be plumose, subplumose, pubescent, or bare, or even extraordinarily pectinate as in one or two abnor- mal genera of Tachinids; the arista itself may be dorsal, sub- apical, or apical, or may be replaced by a more solid style-like appendage. The Thorax. Little can be added to the notes given under “ Terminology.” In most Diptera the mesothorax, usually known as the mesonotum when only its upper part is referred to, occupies the greater portion of that part of the body; both the prothorax (except in some T1PULID#) and metathorax being very much aborted. The thorax is normally oval or subquadrate; in many genera exceedingly elongated (Calobata, Micropeza); in others highly arched (Simulium, Platypeza, Hybos, Cyrvip®, etc.). In rare instances the sides of the thorax are furnished with a strong spine (Zphippium). The sides of the thorax or the pleure have deen described above (p. 6). The scutellum is variable in relative size, but is most frequently semicircular or subtriangular. It reaches its most extraordinary development in Celyphus, in which it forms an enormous spherical cover for the whole of the abdomen, and as the insects are generally smooth and shining, and of a metallic blue, green, or yellowish colour, they are easily mistaken by the beginner for beetles. The scutellum may be distinctly spined on the posterior margin (as in many STRATIOMYID®), serrate, smooth, furnished with bristles or pubescence, or quite bare. The metanotum is in most cases hidden by the scutellum above, except in some families of Nemarocrra in which it is often the more conspicuous of the two. The vestiture of the thorax is as variable as that of the abdomen. The Abdomen. The abdomen in the Diptera varies in the number of segments from four (some ANTHOMYID# and ACALYPTRATA) to as many as nine (in some MycrropHinip®); the normal number in the NEMATOCERA being eight. The basal segment is often much short- ened and almost invisible from above, the first two being some- times more or less fused together. They are numbered from the base, on the upper side, the genital organs not being counted as a: separate segment. The variations in shape of the abdomen are very great. It is very elongate, narrowed, and cylindrical in TreuLip#, Currono- MID®, and CuLicip#®; stout and shorter in some of the other uematocerous families; very short and exceedingly broad and EXTERNAL ANATOMY, 23 convex in many genera of Srratiomyip®; globular and almost transparent in CyRTID#; oval or conical, as in most SyRPHID», and other families of Bracnycrra, and most of the higher Muscip#; elongate and cylindrical in Asttipm, Doticnorip»; subtriangular in many ANTHOMYID# and ACALYPTRATA, In vestiture it varies also; thick long spines are present in many genera of TaCcHININ®; in others, bristles, ordinary pubescence, a pollen-like dust, or scales may form the covering. The male genitalia in the Diptera exhibit the most diverse modifications, and in many groups afford reliable specific characters. Their taxonomic importance, however, must not be overrated, and it must be recognised that they exhibit great variability, even in the same genus. They reach probably their greatest develop- ment in the Donicnopipm®, but are quite conspicuous in many Tipunip#, MycnroruiLip®, ASILID®, and some smaller groups. The female genitalia are much more uniform than those of the male, consisting in the principal families of the Nemavrocera of a pair of oval terminal lamelle often withdrawn into the body-cavity, and in the Treunip® of a pair of exterior pointed valves; whilst in nearly all of the Bracuycera and the Muscipa no organs are visible exteriorly. The Legs. These organs vary throughout the order to an extraordinary degree, from the exceptionally long and delicate legs found in Dolichopeza, Cylindrotoma, and other ‘Tipunip®, to the short incrassated ones in some of the EpHyprin™® and other groups of Acalyptrate Muscrp®. They may be conspicuously dentate, strongly spinose, bristly or practically devoid of hairs, densely pubescent, or ciliate. Frequently the femur, tibia, or tarsus, or one or more joints of the latter may be incrassate, or occasionally fantastically formed, such modifications being at most generic, often not of even that taxonomic value. The Wings. So far as the perfect insect is concerned, the venation of the wings is, for purposes of classification, the soundest and most reliabie structural character in Diptera. The exceptions, though admittedly numerous, are of such a nature that although doubt as to their exact systematie position may at first arise, they can never be actually identified with a wrong family. Many families or groups of families in the Diptera possess strikingly peculiar types of venation of their own. Outside of the NpMaTocERa, one soon learns to recognise, for example, the wing of a Stratiomyid from the faintness of the veins near the posterior margin of the wing and the equally unusual “ crowding-up” of the veins near the anterior margin; and a Dolichopid may be known by the peculiar “kink”, that is present in so many of the genera in that family, placed about the middle of the 3rd and 4th longitudinal veins ; while the SyrpHip® may be distinguished by the upturned 24 INTRODUCTION. ends of the 4th and 5th veins, approaching the Muscid type, yet quite distinct from the true Muscid form as developed in Musca itself and its allies. The Conopipm, Preuncunipz, PLaryprzip#, (Esrrip®, and PxHoRID® have each one a striking and typical venation of its own. Even in the vast mass of the Muscrpa, sensu lato, three tolerably distinct types are present that contain the great majority of the species ; these may be termed the Tachinid, the Muscid, and the Anthomyid respectively. The Acatyprrata, although nominally of the same general plan as the latter type in venation, areas arule easily distinguished by the small, equal-sized, or absent wing-seales or tegule, which in the ANTHOMYID are conspicuous and of unequal size. Among the other families of Bracuycera the student may at first, from the wing alone, find it difficult to distinguish between, say, the TaBpanip«#, Leprip”®, and THEREVID#; the various forms of BomByLiip# and Asirip#, with the allied smaller groups ; and the somewhat erratic types met with in the Empipm; but this discounts but little the pronouncedly characteristic forms of the other families, and a wider experience will enable him to determine between these more allied types of venation. Reverting to the Nemavrocorra, the CecipoMYIp x, CHIRONOMID2, SIMULIID®, BLEPHAROCERID#, Dixtp#, and TrpeuLip# at least have quite characteristic venation. That of the CuLicipa and PsycHopip2 is allied and, with the RuypHips, may at first appear to resemble the TrpuLips, but a short study will enable the student to differentiate them without much difficulty. The re- maining families are not so distinctiveiy characterised, and in these closer examination is necessary. Terminology of venation.—As may be surmised, various systems of venational terminology have been constructed, but, since this is hardly the place wherein to enter into a discussion of their respective merits and demerits, it will be only necessary here to fully describe the system adopted in the present volume. Practi- cally, it is a somewhat modified form of Schiner’s terminology as used in his ‘ Fauna Austriaca,’ and as adopted by the principal dipterologists up to the present day. Osten Sacken, who, according to Schiner,* used a very old- fashioned and unsatisfactory terminology employed vy Walker and others of that period, entirely abandoned it in after years, and the system accepted by him in his celebrated monograph of the North American TrpuLip™ (1869) was the basis of all his subsequent work. Of other systems, mention may be made of that of Schummel, mainly because he wrote extensively on TrpuLiIp®, but he named all the posterior cells backwards, that is, what is now called the 5th was his Ist, and he treated the two submarginal cells as posterior cells, calling them the 6th and 7th. * Fauna Austriaca, ii, p. Xxv. EXTERNAL ANATOMY. 25 The Comstock-Needham system was invented by the former author and elaborated by the latter. Though it must be admitted that Needham’s researches into the homologies of the veins, not only in Diptera, but in other orders of insects also (especially Neuroptera), are, so far as Iam able to judge, perfectly consistent, there seems no necessity to alter the almost universally adopted names of the veins. Moreover, the abbreviations used to de- signate the veins in this new system of venation, such as, Cs 2, R 4+5, M 1+2, and so on, can never convey the decisive mean- ing of terms of obvious significance, such as, costal cell, marginal cell, Ist, 2nd, 3rd longitudinal vein, &c., all of which by their very names at once define their position in the wings. Of all recent systems of terminology I cannot but regard this one as the least acceptable. However, in spite of wholly disagreeing with this system of venation, I must accord Mr. Needham every praise for the excellent series of Tipulid wings published by him, which has been most invaluable to me during my present studies in this family. It must be remembered that modifications to suit special forms are almost imperative, whatever system of classification be adopted, for it is obvious that since some wings are replete with veins, whilst others have very tew, it must be a matter of careful study to decide which are the veins that persist in these latter cases. It is not therefore merely a question of an arbitrary and artificial naming of the parts at caprice. Osten Sacken may be quoted here with advantage :—‘“ Thus, if we force upon the Trputip# the terminology introduced originally in the families of Diptera with a less developed venation, we meet with inextricable difficulties. But there is no more reason for doing so than for following the opposite course, adopting a terminology for the TrpuLip# first and forcing it afterwards upon the Muscipx. It is perfectly arbitrary at which end of the system of Diptera we begin to trace out the homologues of the venation. This study of the homologies has two distinct aims in view ; the scientific aim of showing that the ground-plan of the venation is the same in all the families of the order, and the practical aim of adopting a terminology for descriptive purposes. We cannot carry out a terminology on solely theoretical grounds, we will have to vary the details of it according to the peculiarities of structure occurring in different forms, the main plan remaining the same.” 2. InvERNAL ANATOMY.* cone special features of the internal structure of the Diptera are the high degree of concentration of the nervous system attained in some members of the order; the expansion of the * The works of Brauer, Brandt, and Kiinckel d’Herculais are recommended by Dr. Sharp to the student of internal anatomy in Diptera, Williston has drawn largely on Kellogg, and the notes herein offered are compiled from this source, the present writer never having studied the subject. 26 INTRODUCTION. two main tracheal trunks in the base of the abdomen to form air-sacs, the presence of the sucking-stomach as in the Lepidoptera, the constant number (four, rarely five) of the Malpighian tubes, and the absence of a bursa copulatrix in the females.”* The alimentary canal presents behind the cesophagus, an ex- pansion known as the diverticulum or sucking-stomach,7 the ventriculum or true stomach lying behind it, with, usually, two ceca. The heart is of the usual type, but in the more specialised families has two chambers only. ‘* In the larva of Corethra the heart is a simple elongated tube without chambers.” The two main tracheal trunks expand at the base of the abdomen into conspicuous air-sacs. The two pairs of spiracles of the thorax are provided with “vocal cords” and it is these that cause the humming when the fly is on the wing. The nervous system in the NeMArocEera generally comprises five or six abdominal ganglia and three distinct thoracic ganglia. Intermediate forms are numerous between this type and those of the Muscrip®, in which the abdominal and thoracic ganglia are united into a large mass in the thorax. A minute structure called Johnston’s organ, placed in the 2nd antennal joint, is supposed to contain the auditory nerves. The internal genital organs consist in the male of two oval testes with short vasa deferentia, a well developed penis with accessory copulatory appendages, which are of the most diverse structure even in allied species of the same genus. In the female the ovi- positor is remarkably uniform ; there are a large number of egg- tubes, three spermathecie, paired accessory organs, and no true bursa copulatrix. 3. Tur Harty STAGES OF DIPTmRA. The Larva. The larve of all Diptera are destitute of jomted legs. The larve of other groups most resembling them are those of the CURCULIONID& (Coleoptera), but whereas these latter have little or no power of locomotion, the larve of Diptera can generally move about freely by means of projections on the body called pseudopods; or by the aid of short bristles arranged so as to favour progression, such being present even in completely maggot- like forms. The spiracles are also of great aid in enabling us to decide whether a larva is Dipterous or not. Schiner counted thirteen segments in the larva, first the head, then three representing the Fgnahe the remainder forming fe abdomen. ‘There is, however, no ae! criterion yet * This is from Williston, after caer + This function of this organ has been questioned. THE EARLY STAGES OF DIPTERA. 27, discovered, by which the segments can be numbered, and in many cases the segments cannot be satisfactorily delimited in the present state of knowledge.” (Dr. D. Sharp, in Verrall’s “ British Flies,” vol. v, p. 32.) Many Dipterous larve have no distinct head. These are known as ACEPHALA, as distinct from the EucrrHa.a, or those furnished with a distinct head. The AcupHata include flesh-eating maggots. The term “ hemicephalous ” has been used by Dufour and others for those larvee in which the head end is of an intermediate form, that is to say, not possessing a sufliciently distinct head to be included in the EvcrpHata; and the majority of the families appear to fall into this intermediate division. In these cases the head part is withdrawable within the body, after the manner of a tortoise. “Dipterous larve have the last pair of spiracles largely de- veloped, and they are frequently placed at the actual tip of the body ; when not at the tip, they are usually placed dorsally rather than laterally. These are points of distinction as compared with other orders of insects. When the posterior spiracles are the only pair that exists, the larva is said to be metapneustic ; when in addition to these, there isan anterior pair placed a little behind the head, the larva is amphipneustic; when there are also inter- mediate spiracles the larva is peripneustic. The frequency of the metapneustic and amphipneustic systems is characteristic of Diptera, the peripneustic system being the usual one in other orders.” (Dr. D. Sharp.) The Pupa, The pupa in the OrrHORRHAPHA is “either a free, so-called mummy pupa, or it remains enclosed in the larval skin, which it bursts open at its emergence in the form of a T-shaped fissure on the back, or by an irregular sort of lid at the end of the head.” ( Brauer.) In the CychorrHAPHA *‘ the pupation always takes place in the larval skin, which hardens and becomes like a barrel. Previous to this, the larva possesses on the 4th or 5th front segments, an arched seam, produced horizontally, and extending above the mouth, which seam encloses enough of the surface of the barrel for the emerging flies to burst off as a lid by means of the frontal bladder.” (Brauer.) The Habitats. The habitats of the Diptera in their earlier stages are most diverse. A large proportion are aquatic (CULICIDH, CHIRONOMIDA, STRATIOMYID®, TABANID®, EPHYDRIN4®, etc.), some like Eristalis, in the SyRPHID#, preferring rank pools or drains; quite a large number live in the earth, as do many TrPuLID#, some THEREVID® and Empip®; others in rank or rotting vegetable matter, 2§ oa) INTRODUCTION, (Asitip®, Doticnopipm, SyrPHip#, and many groups of Muscip2); some form galls (CectpoMy11p®), some breed in fungi (Mycrropuyiip® and PLatypnzip®); many are leaf-miners (many ANTHOMYINE, most of the Tryprrina%, and some ORTALIN®A) ; whilst the vast majority of the enormous family Muscipm breed in rotting animal or vegetable matter, as do also many groups of other families, in fact this habitat might be considered the most general one in the order. ) a very small fly. cork, to enable the student to examiue both the dorsum and the right side of the insect without removing it from the cabinet. These minute pins should carry the specimens as near their heads as possible, and be stuck in neatly-cut, oblong pieces of white pith or similarly shaped pieces of cork covered with white paper. These pieces of pith should be broad and long enough to protect the head and legs to a moderate extent, but no broader, otherwise it is impossible to place a strong hand-lens near enough to examine details. Moreover the pith should invariably be of some depth, as this secures a tighter grasp of the large pin which must be thrust through the end of the pith opposite that bearing the specimen.r A dot of white gum placed on the upper side of the pith on the spot where the small fine pin is inserted will fix it securely and a larger drop of gum should be placed around the strong pin where it emerges from the under side of the pith. Some collectors, however, * In removing a delicate specimen from the cabinet the forceps should grasp the pin ahove the insect; in replacing it, the forceps should grasp the pin Jelow the insect, thus in each case minimising the chances of accident. + When fixing the small pin in the pith the head of the insect must be directed away from the strong pin, not facing it, as the latter method adds to the difficulty of viewing the head parts. TILE MOUNTING AND PRESERVATION OF DIPTBRA. 33 prefer not to gum the specimen into the pith, so that it can be removed for closer microscopic examination when necessary. In the case of the excessively minute forms they should be pierced from below the body, the point only of the very smallest pin being inserted so as only just to emerge from the dorsum, the head end of this pin (there being, as said before, no real enlarg- ment as a “ head”) being stuck in the pith, but in this case it is most advisable to gum the pin in the pith, it being much more likely to fall out when inserted, so to speak, upside down. For the closer examination of the anatomical structure of very small Diptera, as PsycHoDID® and all those of still lesser size, it +s convenient to mount some of the specimens on microscopic slides, preferably in a more or less dissected state; but this method has at least one disadvantage, that it frequently destroys all the exterior characters, such as pubescence, spines, bristles, all of which are valuable specitic points of difference. So that unless the species depends solely upon some anatomical structure quite invisible to the naked eye, it should be identified whenever possible defore mounting it on a slide, as it is otherwise often impossible to do so, many of its external characters being after- wards unavailable. The venation of some of the very pubescent PsycHopip# is absolutely invisible until the wings are denuded of the very thick hairs with which they are covered, augmented in many cases by the addition of semi-opaque imbricating scales. It is very difficult to determine a single specimen of such a species unless one wing be broken off and mounted for the microscope, the other one remaining intact on the dried specimen. A new process has somewhat recently come to my notice ; this: is the imbedding of the specimen bodily in an alcoholic solution of eollodion, with a backing of a mixture of oxide of zine and canada: balsam, the collodion protected above by a “ cover slip ” of glass, and the whole mounted on a microseopie slide. ‘The head, wings and legs are arranged so as to be easily examined and there is no danger of the specimen meeting with any damage. This process, although it has the advantage of presenting a perfectly stereoscopic view when seen under the microscope, has the serious disadvantage of only one surface, dorsal or ventral, being visible in any individual specimen; so that unless the identification of each specimen be done by the collector (who in very many cases is himself not a specialist) before mounting, considerable doubt is liable to attach to the specimens from the inability of the actual specialist to examine both sides of the same individual. In the cases of very closely allied species known to occur in the same neighbourhood the positive identification of a large proportion might be impossible. The only way of retaining specimens permanently in good condition * after being properly mounted is by their inclusion in * A collection of Diptera, if the specimens be thoroughly dried at the start, and preserved in a enbinet as described, in a temperate climate, should remain in good condition for not less than a hundred years. D 34 INTRODUCTION. a well-made cabinet of mahogany, oak or teak; the latter wood being the only one that will survive the climatic conditions of the tropics, and even then only in certain regions and with the greatest possible continual care. In all climates in which there is much moisture, a small wad of wool soaked in carbolie acid or creosote must be retained in a corner of each drawer to prevent mould, and the liquid constantly renewed. Naphthaline, camphor or creosote must also be kept in the grooves made for this purpose to keep away mites or similar creatures. Diptera will keep in excellent condition in temperate climates in well-made wooden or even cardboard store-boxes, if made with tightly fitting lids and kept in a dry room. 6. StanpDARD WORKS FOR STUDENTS. The easiest way in which a beginner can obtain a good insight ‘into the families of the Diptera is to obtain tracings, drawn by himself if possible, from plates and figures of the wings of a few of the leading genera of each family (or at all events, of all those genera that give their names to the families), and then to arrange them in a copy-book, leaving ample space for additions and notes. To the wings may advantageously be added the corresponding antenne and palpi. An even moderate study of these placed side by side in their systematic sequence, added to the general appearance or “ facies” of the different families—a perception he will easily acquire—will give him the quickest preliminary knowledge of classification possible. As the soundest introduction to the study of the whole order there is no work to be compared for reliability and conciseness, with Schiner’s “* Fauna Austriaca, Diptera,” in two volumes (1862— 1864). The tables of genera are in themselves a mine of information. In addition to this work may be earnestly recommended Prof. Williston’s 3rd edition of his ‘‘ North American Diptera ” (1908). It is fully up to date, has the advantage of being in English, and is profusely illustrated by diagrams of wings and other parts of the body. These two works in conjunction will make the student acquainted with many hundreds of genera, a large proportion of which are cosmopolitan or nearly so, Both works are easily obtained at a moderate price.* For minuteness of detail and the full history of synonymy in the families dealt with, Mr. Verrall’s huge work on ‘ British Flies” should, when completed, be the standard work on the order for the next century. Other works which are absolutely indispensable to the earnest student, especially of exotic flies as well as European species, are: Meigen’s “ Systematische Beschreibung, ete.,” Wiedemann’s “ Aus- gereuropaische zweiflugelige Insekten,” Macquart’s ‘“ Diptéres * About thirty-two shillings and sixteen shillings respectively. STANDARD WORKS FOR STUDENTS. 35 exotiques,” Zetterstedt’s “ Diptera Scandinavie,” Walker’s “ List of the dipterous insects in the British Museum,” and “ Insecta Saundersiana,” Bigot’s ‘‘ Diptéres nouveaux, ete.,” Schiner’s ‘ Reise der Novara” and the “ Biologia Centrali-Americana.” Everything written by at least Loew, Osten Sacken, Schiner, Williston and Van der Wulp should be obtained, whilst the works of Rondani and Robineau-Desvoidy, though less reliable, are always in requisition. All the writings of living dipterologists should also be consulted. 7. ESTIMATED NUMBER OF KNOWN SPECIES, The Diprera, or two-winged insects, may be regarded as represented by about 35,000 described species. Of these some portion will, of course, be ultimately relegated to synonymy, but, even after deleting these, the remainder in all probability represent but a tithe of those actually existing throughout the world. Many regions have been practically unexplored by the collector. Such parts are the bulk of the South American Continent, where many thousands must remain to be discovered in the immensely fertile valleys of the Amazon, Orinoco, La Plata and other large rivers, and in the teeming tropical districts of the northern part of the Continent. Africa is at present almost unworked, save for the Mediterranean shores, Egypt, Italian East Africa and the Cape; none of these, moreover, having been treated to a tenth part of the study that has been given to the Diptera of Western Europe. Australia, judging from what I possess of unnamed material in my own collection, must. eventually yield a rich quota ; Skuse, the only writer in that country, gave 10,000 as a reasonable estimate of the species probably existent there. Besides these, there are large areas in Asia and even in Eastern Europe which have hardly been touched by the collector. A very large number of species must still remain to be discovered in the vast North American continent, whilst lesser worked regions of the New World, Mexico, Central America and the West Indies will certainly double or treble their present lists of species, if the enormous increase during the past three or four sere in the known forms of the Oriental Region in such groups as have been more thoroughly worked, is any criterion. For instanee, no family has ever been so systematically or assiduously collected i in such a number of varied districts through- out the world as have the Cuxicip" during the past ten years or thereabout, and the enormous increase in the recorded species in this family (even allowing for a large proportion of synonyms or varieties only, as was suggested by me a few years ago),* seems to foretell a grand total throughout the whole order of incredible * “Catal. Orient. Culicide,” Rec. Ind. Mus, i, p. 297. D2 36 INTRODUCTION, maguitude, if other families, as may reasonably be supposed, are as prolific of new forms as the Cunicrp# have proved. Schiner in 1868,* in noting that 19,449 species were at that time known, distributed them geographically as follows :—Europe 8670, Asia 2046, Africa 1644, America 5577, and Australasia 1056, the remaining 516 coming from unknown localities. In Hardwicke’s ‘Science Gossip,’ fifteen or more years ago, cal- culating pro rata according to geograpical areas, I estimated 200,000 as a quite moderate estimate of the number of species in actual existence ! The Palearctic Catalogue, recently issued, gives a little over 13,000 f as inhabiting the Palearctic Region up to the year 1907 ; Aldrich accumulates about 9000 species indigenous to North Americat; Van der Wulp’s Catalogue of South Asian Diptera totalled 2889 up to not later than 1906; whilst a manuscript Catalogue of my own compiled on the recorded Australasian Diptera includes about 2000 (up to 1909), to which I am continually making additions that have been overlooked. The gigantic Catalogue of the world’s Diptera, by Prof. Kertész, now in progress, gives a total of about 13,600 species as known in the families at present dealt with ; that is to say, the Nemarocera and practically all the remaining families except the Muscrp# If this last enormous family bears the ‘same proportion in the world’s species as it does in the Palearctic fauna, it should comprise 14,000, making a total of between 33,000 and 34,000 as actually known from all parts of the world. But since the publication of the two volumes containing the NeMaAtocerA, something like 500 species of CuLicrpm® alone have been described, whilst my own labours in this suborder will result in the erection of considerably over 300 more (including those in this volume), without touching the CuLicipm, CuiroNno- MID® and CrcrpomMy1p”®, and these 300, moreover, are from the Orient alone. Prof. Kieffer has added about 250 species to, the CHIRONOMID® and a limited number to the Cucrpomy1pa, all these practically from the Indian Empire only. To illustrate how small a region has been worked over, ic may be noted that the Oriental NeEMAroceRA were represented by only 230 species in Van der Wulp’s Catalogue (1896), since which the number has been increased to 1200 or a gain of over 400 °/,. Moreover, even this great increase of species has been gleaned from a comparatively small number of localities, the bulk of them (with the exception of the Cunicip®) having been collected in three or four Himalayan districts of quite limited extent (Mussoori, Simla, Naini Tal and Darjiling) ; Calcutta and its immediate environs ; * ‘Reise der Novara.” + This isan approximation: the actual number of species contained in each of the four volumes not being quoted by the authors, but the estimate is probably sufficiently near the truth for the present purpose. t “Catal. North Amer. Dipt.” (1905). The estimate is mine ; the catalogue is compiled up to Jan, Ist, 1904. CLASSIFICATION OF THE DIPTERA, “yf perhaps half-a dozen Indian localities situated in the plains (Puri, Pusa, Purneah, etc.); a comparatively small tract in Travancore, South India (during one visit only); several localities in Ceylon ; and perhaps half-a-dozen others in Assam and Burma. These localities do not represent a tenth part of the Indian Empire even allowing a fifty mile radius to each. Realising that the Numa- TocERA themselves only represent a fifth or a sixth part of the whole order of Diptera, the immense possibilities lying before the student will be apparent. 8. Tum CLASSIFICATION OF THE DIPTERA, It cannot be said that there is at present any universally accepted classification of the Diptera, although most authors are agreed on Brauer’s primary divisions of ORrrHoRRHAPHA and Cycborruapnua, and the secondary division of the former into Nemarocera and Bracuycera. The lesser subdivisions higher than families, especially amongst the Bracuycura, proposed by various authors on different groupings of families, are so numerous that it would be out of place in the present work to give them in detail, much less to discuss them. Williston * gives in full Brauer’s, Schiner’s, Osten Sacken’s and Coquillett’s classifications, in order that the student in his study “may not reach the erroneous conclusion that any system is authoritative.” He also gives a classification by a new writer on this subject, Lameere, but this author has been so severely criticised that his views are not included here.T The division into OrrTHORRHAPHA and CYCLORRHAPHA ‘may perhaps safely be accepted, since all, or nearly all, ares agreed thereon, though by no means agreed as to their rank and limits.” Osten Sacken considered that the characters recognised as distinctive of the Nemavocrra and Bracuycera are of more funda- mental importance than those distinguishing the ORTHORRHAPHA and CychorRHAPHA, an opinion from which Williston differs, accepting Brauer’s primary divisions as the truer biologically. By far the most pertinent and concise account of the dis- tinctions between the Nematrocrera and Bracuycrra, and the best and most elaborate synoptical table of families in the latter division is that in Mr. Verrall’s monumental work on “ British Flies.” = Biological notes of paramount importance are given of each family. * “North American Diptera,” 3rd edition, p. 52. + It seems out of place in the present work to dilate on the classification of this order as proposed by the very earliest writers. The works quoted may be consulted by those readers desiring this information. t In vol. v.—Srratiomyip&, ete.”; the second of the two volumes at present published, Brauer’s descriptions of his suborders and higher groups are translated in Mr. Verrall’s first published volume (vol. viii.), and should be studied by those interested in the subject. 38 INTRODUCTION, The subject of the higher systematic subdivisions of the Diptera has never received from me any special study, so that, perhaps, opinions on it are out of place, but I have always considered the Nemarocera and Bracuycera (by which latter I mean all the remaining families except the EproposcrpEA) as a more natural classification of the perfect insects than the shutting off of the Syrpuip# and allied families from the present-day ‘‘ BRACHYCERA,” and allying them to the Muscids in a common group, opposed to the NemMaToceRA and present-day ‘“‘ BRacHycprRA” combined. If the OrrHorrHapHaA and CycLorRHAPHA are recognised as the primary divisions, it seems to me that the secondary divisions might be called Nemarocera and OrrHopracHycera, in the OrrHoRRHAPHA; and CycLhopracHyceraA, Muscorpna (= Mvs- CID, sensu lato, plus PHortp&®) and Erroposcrpua (or PuprpaRra), in the CYCLORRHAPHA. I cannot help feeling instinctively that the most natural classification is into'two suborders, NEMATOCERA and BRACHYCERA, the latter divided into two groups, the first containing all the families exeept the Muscrpm* and PHorip®, which together would form the second group. The Puprpara might either form a third group of the Braciycura or constitute a third suborder. In other words, it seems unnatural to me to separate the SyrPHIp#, PipuncuLip® and PuLaryprztpm from the families forming the present-day Bracuycera. The Muscrp® as a whole seein to form a very compact, homogeneous group, quite different in external structure, appearance, and habits from the other Brachy- cerous families, and possessing a typical venation. The aberrant family PHor1p® seems most nearly allied to the Muscrp™, through the Borzorin& or some allied group. The unfortanate part of the primary classification (though possibly biologically correct) into ORTHORRHAPHA and CyYCLORRHAPHA is that that system affords no easy clue to the determination of the perfect insects, since the absence or presence of the frontal lunule is the only character offered and this moreover is either absent or incon- spicuous in three families of CycLorrHAPHA in which it should be present, including the extensive family Syrpuipm. Since be- ginners certainly never commence their studies with life-histories, I defy any ordinary entomologist attacking the Diptera as a new study to sort out into eae respective suborders a box full of mixed Diptera of mary families. He would therefore inevitably be compelled to fall back on the old groups of Nemarocera and BRACHYCERA, eliminating the Syrpuipm, PipuncuLipm, Puary- pEzIpz, Muscip#, Puortp® and so on, by their respective very typical systems of venation. * Tam convinced that the whole of the Muscip should be included in a single family and that the Tachinids, Anthomyids and so on should rank but as sub-families, the various Acalyptrate groups each forming a subfamily of equal rank with them. The Dexids and Sarcophagids would be sunk in Tacninin&, and the intermediate Calyptrate subfamily would be Muscin™ (in the old sense), SUB-ORDBERS OF THE DIPTERA. 39 9. Tur SUBORDERS OF THE DIPTERA. The majority of authors have adopted Brauer’s division of the order into ORTHORRHAPHA and CyCLoRRHAPHA, separated mainly according to the method in which the perfect insect escapes from the pupa-case. These suborders may be thus characterized :— Suborder ORTHORRHAPHA. Diptera in which the pupa-case is “‘ mummy-like,” more or less indicating the outlines of the imago, as in the common crane-fly or ‘ daddy-long-legs ” (Tipula). The fly emerges “from the dried larval skin forming the pupa- ease through the T-shaped opening which is formed by a length-wise split on the back, near the head-end, and by a cross- wise split at the front end of this ; or (rarely) through a cross-wise split between the 8th and 9th abdominal segments. Adults without a frontal lunule. Larva with a ‘“ jaw-capsule” (Kieferkapsel) or more or less distinct head. Pupa free, or enclosed in the larval skin. Suborder CYCLORRHAPHA. Diptera in which the pupa-case is oval or egg-shaped, with a comparatively smooth surface, bearing no resemblance whatever to the perfect insect. For example the common house-fly (Musca) and blow-fly (Calliphora). The fly emerges from the puparium through a circular orifice made by the insect pushing off the head-end.* Adults possessing a frontal Junule. “The frontal lunule is a small crescent-shaped piece im- mediately above the antenne, which is characteristic of the second suborder, the CycLhorrHAPHA. In most of the members of this suborder there is a suture separating the lunule from that part of the head above it, the ‘frontal suture’; and {frequently this suture extends down on each side to near the mouth. But as the suture is wanting in several families of the CycLorrHaPHA it is often difficult to determine whether the lunule is present or not.” + (Comstock, 1895.) The larva is without any distinct head. * Tt effects this by means of the ptilinum, a small bladder-like organ situated. immediately above the base of the antenne, the inflation of which by the imago springs off the upper piece or cap of the puparium. It is of course only present in the Oycborrmapaa, since the ORTHORRUAPHA escape from the pupa-case in another manner. + These families are the Syrruip#, PreuncuLin& and PLarypnzip2x. 40 ORTHORRHAPHA,. The suborder OrrHorRHAPHA is divided into two groups, the Numatocera and the BracHycura (meaning “ thread-horn” and ‘“ short-horn” respectively), which are distinguished from one another by the following characters NEMATOCERA, Latr. “ Palpi pendulous; generally 4- or 5- jointed, and more or less filiform. When (as in Aedes and some genera of CECIDOMYID) there are only one or two joints, the structure of the antenne and the venation remove all doubts.” (Verrall, “‘ British Flies,” 1909.) Antenne composed of two basal joints (which are practically always differentiated from the others and known as the scape) and a flagellum of several joints (at least 6, generally 8 to 16, occasionally as many as nearly 40),* which are homologous, that is to say, closely resembling one another.t They are most usually oval or cylindrical, not infrequently bead-like, sometimes disciform, flask-shaped, pectinate or thread-like. The antennee of the male in many cases (CULICIDM, CHIRONOMID#, CLENOPHORINI, etc.) differ very considerably in vestiture from those of the female. Wings with a venation varying from a simple form (CEcrDo- MyIDM and some CHIRONOMIDA, ete.) to a very complex form (in most TrpuLip#). Anal cell (when present) wide open,t and with a tendency to greater width at the wing-margin; as con- trasted with the Bracuycrra, in which it is, as a rule, closed before the margin of the wing ; or when open, it is nearly always narrowed towards and at the wing-margin. ‘The 2nd longi- tudinal vein often furcate, the 35rd vein rarely.$ Discal cell rarely present, except in ‘'1rPULID# (in which it is also not infre- quently absent or capricious, according to the individual) and in the RuyPHID”. ; “Tn all cases of doubt as to whether a fly belongs to the Nematocera, through the palpi being only one- or two-jointed (as in Aedes or some genera of CrucipoMy1p#), the structure of the antennze and the venation should remove all doubt. When the antenne are shortened. and the flagellum (=38rd joint) is appa- rently only annulated (as in the “BIBIONID®, SIMULIIDM and * Some authors dispute this, saying 28 is the highest number known. + This term is used here in the same sense as Mr. Verrall employs it in his classificatory introduction to the second published volume (vol. v.) of his “ British Flies.” That is. to say, in its popular and ordinary sense of “having the same relative position, proportion, value or structure, aud not in its zoological sense, that the hand of a man and the fore-foot of a horse are homologues.” id The only exceptions occur in a few Brpionip2#. < Williston adds, “ if ever.” I have in the present work temporarily Peco aniaedl a certain forked vein in some genera of Brsionip# as the 3rd and not the 2nd longitudinal, although haying doubts on the subject; and this prevents a statement that the 3rd vein is mever furcate in the NEMATOCERA. ORTHORRHAPHA. 41 Ruyrnip#), then the antenne never bear any terminal style or arista,* and the venation is either completely distinct from any of the Bracuyogra, or, if rather similar to that of the Bracny- cera (as in Rhyphus), the widened end of the anal cell determines its position, and in these cases the many-jointed pendulous palpi are distinct.” (Verrall, 1909.) “ Larve with horizontally biting upper jaws, or with the mouth- parts quite rudimentary, in which case the larve are peripneustic, and have 13 segments.” (Brauer.) BRACHYCERA, Macq. “ Palpi porrect, not pendulous; 1- or 2- jointed (sometimes rudimentary); if two-jointed, the 2nd joint is more or less clavate, and larger than the Ist, which appears to be a handle to the 2nd.” (Verrall, 1909.) Antenne composed of two basal joints (the Ist sometimes almost imperceptible), generally differentiated from the 3rd, but in many groups, less conspicuously so than in the NEMATOCERA ; and a third joint, which varies in shape, size and nature to a very great extent. In most cases it is an obviously solid joint of quite a different form from that of the basal joints (SYRPHID4, Muscip#, etc.); in several groups it is, whilst differing greatly from the basal joints, annulated, that is, marked with fine transverse lines as though composed of several joints closely compressed (STRATIO- MYIDE, TABANIDE, CENOMYID®, etc.) ; in others (Asizipm® and some BoMBYLIID.®, ete.) it is elongate and cylindrical, somewhat resembling the basal joints but longer. The 3rd joint may or may not support a style or arista, the latter may be dorsal, but is more often apical. In cases where the 3rd joint is elongate and annulated also, thus bearing, to the elementary student, some resemblance to the nematocerous form of this organ, the porrect palpi, and especially the yenation, will instantly remove all doubts. (Such genera are Stratiomyia, Ceenomyia, Hevatoma, etc.) Wings nearly always with a venation of some complexity, but in some genera of Empip® and Donicnorrp® it is reduced to more simple form. Anal cell +, when open, always contracted near the hind margin of the wing; but more generally closed before the margin, often at a considerable distance from it. The 2nd longitudinal vein not furcate, the 3rd very often fureate. * The only apparent exception is in the OrrineruiLip®, an abnormal group of extremely limited extent, comprising only five known species, and not known to occur in the Hast. In these flies the flagellum is avistiform. In Chionex, a wingless Tipulid (not found in the East either), the flagellum ends in a slender 3-jointed style. For Oriental students, the rule may be considered to have no exception. + T follow Verrall in this, but the beginner is liable to have some difficulty in recognising this cell in wings of very simple venation. 42 ORTHORRHAPHA,. Discal cell nearly always present, but absent in some genera of Empip#, Donticnoripm. PLhatTyPEzip»®, ete. “In all cases of doubt as to whether a fly belongs to the Bracuycyra or Nematoorras (and doubt could only arise in some STRATIOMYIDH and Luprip®), because of an annulated, flagellum- like 3rd joint at the antenne (asin Rhachicerus, Beris, Xylophagus, Cenomyia, etc.), the contraction of the anal cell towards the wing-margin provides an infallible character.” (Verrall, 1909.) “ Larve with parallel jaws, moving upwards and downwards, or outwards and downwards, which are used for piercing, hacking, boring or sucking. Head not fully developed, only a jaw-case without ganglia present, which, however, sometimes is almost a head, because of the outwardly projecting eyes. Chain of ganglia beginning behind the jaw-case. Larve with rudimentary mouth- -parts ; meta- or amphi-pneustic, and com- posed of 10 to 12 segments.” (Brauer.) Tables of Fanalies in NBMATOCERA. 1. Thorax with a conspicuous V-shaped suture on the mesonotum (indistinct but present in PrycHoprurina). Discal cell normally present. All the veins equally distinct and complete... Tipulidee, p. 265. Thorax without a conspicuous Y- shaped suture on the mesonotum (except in incomplete form in some BLeEPHAROCERID#). Discal cell al- ways absent, except in RuypHipm.. 2. 2. Wing with seven longitudinal veins (apart from the forkingss of any of these) reaching the margin of the wine. Auxiliary vein always present. 3. Wing with less than seven longitudinal veins (apart from the forkines of any of these) reaching the margin of the wing (except in Chironomus, in which the auxiliary vein and 2nd _ longi- tudinal vein are always faint) ...... 6. 3. Wings bare, never with scales or hairs. Eyes rounded. Proboscis never formed for biting; palpi incurved.......... 4, Wings never bare, always thickly covered with scales or hair, or both. Eyes reniform (Iidney-shaped). Pro- boscis nearly always expressly formed ue biting, or at least capable of doing ; palpi in Cunicripm stiff and ate aig Tiles. cl a alegeiateleie diay. «is < taehm pa 5, 4, Discal cell always present. Head in male holoptic (eyes contiguous), or practically so. Antenne distinctly jointed, the joints annular or oval .. Rhyphide, p. 549. NEMATOCERA. 43 Discal cell always absent. Head in male dichoptic (eyes separated), Antenne filiform, the apical part indi- visible into exact joints ............ Dixide, p, 257. 5. Wings with scales. Legs long and slender. Proboscis always long, stiff, conspicuous, formed expressly for biting (except Corethra). Palpi long, stiff, prominent (except Corethra).... Culicidee. Wings with hairs (in some species also with small white spots composed of seales*), Legs short and compara- tively stout. Proboscis, without being so long and conspicuous, elongate and horny in Phlebotomus, formed for biting, and in some PsycHODIN#, though short, capable of piercing the skin. Palpi short, incurved ....... . Psychodide, p. 196. 6. Lees short and stout (about the same as in the BracuycERA). Head in male holoptic. Antenne short and com- paratively stout, shorter than thorax . 7. Legs normally long and slender (except only in Orphnephila). Head in male dichoptic (except in one or two genera of MycreropHitipz#). Antenne long and slender (except in Orphnephila), often longer than the head and thorax PBROTIOFOREDINGT 4) ,°. dye 'a.n'e tovne a's caest ates 8. 7. The 2nd basal cell and the posterior cross-vein present. All veins distinct (Brsrontna).*+ Wings normally broad, costal vein extending round the mar- gin of the wing. Ocelli present. Antenne short and stout .......... Bibionide, p. 157. The 2nd basal cell always present ; posterior cross-vein always absent. Auxiliary, Ist and 8rd longitudinal veins thickened, the rest generally faint. Wing distinctly broader than usual. Costal vein ending at tip of wing. Ocelli absent. Antenne long, slender, typically nematocerous...... Simuliide, p. 182. 8. Antennee apparently of three joints, terminating in a bristle. Wing with two basal cells. Legs comparatively SOU Eee er eect ern sisacueetaicde ewes ethcuce sens Orphnephilidze Antenne normally nematocerous. (not Oriental). Wing with only one basal cell (except in one or two genera of BLEPHARO- CERID®). Legs long and slender .. 9. * In a few species the wing itself is more or less covered with small scales, in addition to or irrespective of such spots. + When the 2nd basal cell and the posterior cross-vein are absent, the longitudinal veins are always very indistinct (ScarorsiIn#), 44 NEMATOCERA. 9. Wing with a secondary venation, form- ing a spider-web- -like network, in addition to the primary characteristic normal venation. (Thorax with an incomplete suture) ...........- ,... Blepharoceride, p. 148. Wing without such secondar y network venation ...... ois fo uane eae eres cee BLO! 10. Costal vein ending at tip of wing, not earried round posterior MAMTA eee opel Pd Costal vein continued around the whole margin of the wing.......... wore ee Geridomyides. 11. Tibize without spurs; coxee never con- spicuously enlarged. Anterior cross- vein, when ene transverse as USUAL oe eee eee she a alade Magu vent Chironomide. Tibize always with spurs ; coxve greatly and conspicuously developed (Mycr- TOPHILIN”), or, if normal, then the anterior cross-vein placed longi- tidinally (SCARING?) cc.) ee os Mycetophilide, p. 44. MYCETOPHILID. The MycrropuHiLip® area rather well-defined family, distributed throughout the world from the arctic regions to the tropics, but Fig. 7.—Mycetophila. most numerous in temperate climates and altitudes of four or five thousand feet upwards in warmer regions. They are delicate in structure and comparatively small or very small in size, for the greater part obscure in colour, blackish, brownish or yellowish, rarely with really vivid colours, but often with paler markings. MYCETOPHILID ©. 45 In the typical subfamily the principal genus, Mycetophila, with some others, possesses a laterally compressed abdomen, which, with the hump-shaped thorax and low small head, gives them the appearance of fleas, the resemblance being further heightened by the power of leaping to some extent by means of the well- developed hind legs. There are no macrochetx in the family, the majority of the species being almost devoid of all but a microscopic pubescence and a few bristly hairs on certain parts of the body. The tibiz, however, are in most cases (except ScrARIN®) furnished with two or three rows of bristles, which afford good characters for classi- fication, and also with apical spurs. The coxe are more or less enlarged, often very considerably so, in all the subfamilies except ScraRin®, in which they are nearly normal. ‘he imagos are found in shady places in fields and woods, the larval stages being passed in fungi in a large number of the species, in rotten wood in many others, whilst a limited number are aquatic. A few species live in vegetable mould, under the bark of trees or in cow dung, and many occur in marshy places. About four hundred extinct species are known, a good number of these belonging to the more extensive recent genera, though they appear geologically as early as the Mesozoic period, in the Purbeck beds. Popularly they are known as fungus-gnats, from their breeding in fungi, and it has been claimed that their presence is of economic value to the farmer by keeping down the fungi which would otherwise by their numbers injure trees and shrubs. Some species are said to hibernate and reappear in early spring when, according to Heeger, they “copulate after a few days, generally in the evening. After six or ten days, the female, if the weather is moist and rainy, lays its eggs on the tungi growing on old horse-chesnuts, singly, twenty or thirty on the same fungus. The larve hatch after eight or ten days.” The family characters of the adult Mycetophilid may be briefly summarised as follows :— Head small, rounded or moderately elongate ; eyes rounded or sometimes reniform, separated in both sexes by a broad frons. Ocelli two or three; when only two, they are placed each touching an eye-margin ; when three, they may be in the form of a more or less flattened triangle, or practically in a straight line, but the middle one is always on the centre line of the frons. Antenne elongate, of 12 to 16 joints; the scapal or two basal joints differentiated, the rest generally cylindrical, in some genera compressed, more rarely pectinate. Proboscis short, blunt; quite elongate in one or two genera only (Gnoriste is the only Oriental genus). Palpi of three or four joints, incurved, the Ist very small, occasionally one joint much more strongly developed than the others. 46 MYCETOPHILIDE. Thorax moderately arched, in a few cases conspicuously so ; scutellum comparatively small, metanotum prominent. Abdomen elongate and generally cylindrical in the male, pointed in the female, often laterally compressed in both sexes ; normally 6- or 7-jointed ; often contracted at the base. The male genitalia are complex and prominent, variable in structure, but less so than in the TrPuLIp®; the female ovipositor short, not prominent, with two terminal lamelle. Legs long, slender and delicate, with the cox as a rule distinctly enlarged and elongate in all the subfamilies except ScIARIN®, in which they are more nearly normal. Tibie with spurs at the tips, and often with two or three rows of bristles affording good classificatory characters ; femora in some groups more or less flattened and widened. Wings comparatively broad, oval or slightly elongate, humeral cross-vein nearly always present, subcostal cross-vein rarely ; auxiliary (or ‘‘ subcostal ”) generally short, rarely extending beyond middle of wing; 1st longitudinal long, the 2nd longitudinal absent, the 3rd emerging from the Ist generally about its middle and ending a little before the wing-tip usually at the spot or very near where the costal vein terminates. The 3rd vein often forked, the upper branch often short and so obliquely placed as to appear as a cross-vein (especially m Macrocera and Scro- PHILIN®, in the latter enclosing an additional cell, by cutting off the basal portion of the marginal cell).* The 3rd vein in two groups is coalescent with the 4th for a short distance (Macro- CERINE, CEROPLATIN®); the 4th longitudinal is always forked, at varying distances from the base, the 5th also; in both these veins, one or both the branches may be indistinct on the basal portion. Posterior cross-vein present or absent, in the latter case its absence being due to the coalescence (sometimes only puncti- form or nearly so) of the 4th and Sth veins. Marginal cross- vein absent ; 7 discal cell always absent; 6th and 7th longitudinal veins more or less incomplete or indistinct in most genera, in a few well developed, often one or the other rudimentary or absent. One genus in this family is wingless.£ In the Scrarinzx the auxiliary vein is always straight and ending free, never united either to the costa or the Ist longitudinal vein; the Ist is moderately long, the 3rd_ begins at a right angle, and the anterior cross-vein is so oblique, and as a rule long, as to appear in a line with that portion of it after the bend. The 4th vein is forked at * Being bounded by the 3rd longitudinal vein, instead of the 2nd, this cell is technically perhaps the submarginal. I propose the name ‘ Sciophiline cell” for it, as characteristic of this subfamily. + The only doubtful case is Allactoneura, Meij., q. v. + Epidapus, a non-Oriental genus. Winnertz says that LF. venaticus, Hal., found in Europe, breeds in the rotting stems of Carpinus betule in company with some species of Campylomyza (Crcipomyipm), . scabiei, Hopkins, according to its author, is the cause of some disease in the potato, forming a kind of scab. MYCETOPHILID®. 47 varying distances from the base according to the species, and perhaps too much importance has been placed on this as a character in classification. The 5th vein is widely forked at the base, the upper branch sometimes detached; 6th incomplete ; 7th rudimentary or absent. Life-history.—The metamorphoses of a good many species, mostly European, are known, but no Oriental species has yet been studied in the earlier stages. The eges are laid singly on the underside of a leaf, or on the pileus of a fungus, but in the case of Sciara they may frequently be joined together end to end in a long string, and I have often met with specimens of this genus with such a string of eggs still attached to the abdomen, from which by slight pressure further eggs could be made to extrude. The larva itself has generally the appearance of a very elongate, sub-cylindrical, semi-transparent, worm-like maggot, of twelve segments, with a distinct but small head, and yellowish or dirty white in colour. Osten Sacken’s description of the larva of Mycetophila may be drawn upon here. «A distinct horny head; a fleshy labrum, encased in a horny frame; horny flat lamelliform mandibles, indented on the inside ; maxille with a large coriaceous inner lobe and a horny outside piece, with a circular excision at the tip ; labiam horny, small and almost rudimentary; body fleshy, with eight pairs of stigmata.” One pair of stigmata is on the first thoracic segment, the remaining seven on the first seven abdominal segments. The larva possesses antenne, which in most genera are more or less rudimentary, but in some (Bolitophila, for example, a non- Oriental genus) they are distinctly jointed. In some genera ocelli are present. The means of progression are furnished by rows of short bristles on the under surface. Most of the larve are peripneustic.* Some species spin true cocoons when preparing to pupate, whilst others construct a rude pupa-case from earthy materials, Occasionally (Hpicypta, a Huropean genus) the larval skin is adapted to form a cocoon in which to pupate, but the pupa itself is free. Itis smooth, with more rounded corners than in the Tiputrip®, the legs and antenne being generally distinctly recognisable. Geographical Distribution.—W orld-wide, from the Arctic Circle to the tropics in both hemispheres, but most abundant in temperate regions. In comparing the Mycrropnttip® as a family with the other families of NeMAvToceRA, it may be remembered that although the Scrarinm are usually ranked as a subfamily only of an equal * Tn at least one non-Oriental species, Mycetobia pallipes, Mg., from Britain and North Europe, the larva is amphipneustic, that is, it has a pair of stigmata at the tail-end and a pair on the first thoracic segment. 48 MYCHETOPHILID®. value with the other subfamilies, they possess two tolerably con- sistent characters that separate them from these other families taken together; so that many authors regard this family as divided into two parts, the Mycetophilid part and the Sciarid part, the former divisible into several well marked subfamilies, the latter practically represented by the gigantic genus Sciara alone. The Mycetophilids, taken in bulk, are nearly always recognisable from the rest of the NeMArocERA by their much enlarged coxee, whilst the Sciarids, wanting this particular characteristic, may be recognised by their reduced venation, in conjunction with the abnormal obliquity of the anterior cross-vein, which is so parallel to the longitudinal axis of the wing as to appear nearly always as the basal portion of the 3rd longitudinal vein. They can hardly be mistaken for any other group except some CEcrpo- MYID®, but an absolute beginner might confuse them with a small Plecia, and from this, the long slender antennz would at once distinguish them. In the generic descriptions Johannsen (Gen. Ins., Fase. 93, 1909) has been largely relied on, as the latest cosmopolitan worker in this group, and his characters have been accepted and generally copied verbatim, except that the descriptions of the venation are my own, in order that the terminology may be consistent with that of the remainder of the present work. Table of Subfamilies. 1. Coxe moderately long; anterior cross-vein nearly in a line with ‘i longitudinal axis of the wing. The 5th longitudinal vein forked near base of WIDE #, (o jaaiei's Gpmph ae ple tee SCIARINA, p. 119, Coxe conspicuously elongated ; anterior cross-vein nearly always sufficiently trans- verse to occupy generally its normal POSUULOW ts srcthsel ue ie mar osteo emacs coe 2. The 4th longitudinal vein arises from the 5th near base of wing; 6th vein more or legs'imdistincty +: cick act creeeiteas rien) crore et 3. The 4th longitudinal vein arises opposite or beyond the origin of the 3rd vein; 6th vein generally distinct.) sy eee ne aes 3. The Zid longitudinal vein forked ; its anterior branch usually so near its origin and so transverse that it resembles an additional bo cross-vein. ‘Three ocelli present ........ SCIOPHILINA, p. C8. The 3rd longitudinal vein not forked ...... MyYCETOPHILIN», [p. 80. A, The Srdi vein notetorked. <5. 22.4 te sye ee yee oe © Drapocipiin&.* Ache Src. veri thice gee ites Sieh ecreuincue re, or 5. * Although no species of Drapocipiin®, Myceroprin& or Bourropninin® has been found in the East, it seems eminently desirable in the present unsatis- factory state of our knowledge of this family to include in the table all the recognised subfamilies, since it is probable that one or all of them really exist in that region. MACROCERA. 49° 5. Anterior branch of 8rd vein very long, ending DUMPS AE Beets ah calor ofa marginata, sp. n., p. 62. Thorax darker brown, with still darker stripes, shoulders conspicuously pale WENO NVATS IN acta do. 2 5 woah s dala rargrer equine vicina, sp. n.,* p. 63. 8. Abdomen with only two bands, which GROPING AUS no, Syoke ate 3 Seep le «ts venusta, W1k., p. 63. Abdomen with three or more yellowish ATEN yy ata «Alec hic0) 5 « spate hid sosveutrerate ener 9. 9. Abdomen eight-segmented ...........+.. octosegmentata, sp. 0., Abdomen seven-segmented as usual...... 10. [p. 64. 10. Thorax reddish yellow, with or without three dark stripes, sometimes nearly filmy be] POKSUMI «se slates ate Seve bre « Ie Thorax black or blackish, that is, the ground-colour, apart from the three stripes, which, if present, may be sub- contiguous and occupy nearly all the CLORSUM y oistaraia’ «ccs oats Maes biaratosiovaiecctiy « 15. 11. Basal section of 4th longitudinal vein (7. e., anterior to the fork) one-third as long as fork, Thorax wholly reddish yellow, UMMED MOU tastes gs opiiidias «cess: 12, Basal section of 4th vein much less than one-fourth the length of the fork. Thorax reddish yellow, with three Gark’ stripes sasccawupncre ee Cdcs ck ees - longifurcata, sp.n., p. 65. * Possibly a variety of P. marginata. 60 MYCETOPHILID®. 12. Antenne brownish yellow; all the veins equally distinet . si) + deena so uiee ruficornis, sp. n., p. 64, Antenne black; veins in posterior half of [p. 65, Wing Very indistinet 4 J. -a\ sae... indistincta, sp. L., 13, Abdomen wholly black ................ funerea, sp. n., p. 65. Abdomen with margins of segments Yellowish < s\c crcl oe he eee ee 5) A: 14. Posterior cross-vein longer and much more transverse; base of 8rd and 4th, 5th and 6th veins indistinct ............ Jlavomarginata, sp. n., Posterior cross-vein shorter, nearly longi- p. 66. tudinal; all veins very distinct and black ; coxe yellow, femora and tibie distimetily smokey isrs5..cdeor ava hae ome Sumapes, sp. 0., p. G6. 9. Platyura grandis, sp. nov. (PI. I, fig. 7.) 3 2. Head: vertex and back of head black, face and palpi brown; antennal scape brown, flagellum reddish yellow. Thorax : dorsum dull black, with greyish dusting towards the sides and below the shoulders. No conspicuous macrochetal bristles, apparently ; a few short stiff bristles in front of the wings, and here and there laterally; sides reddish brown. Scutellum with posterior border a little yellowish, the metanotum with grey dusting. Aédomen: 1st segment black (in male with a very narrow pale yellow hind margin); rest of abdomen mainly reddish yellow; base of 2nd segment black, base of 3rd yellowish (less distinct in male), dorsum of segments blackish in male ; a faint violet-greyish tinge at basal corners of 4th and 5th segments in female; belly reddish brown, with blackish marks; violet-grey at base of middle segments in female. Genitalia not easily viewed owing to the specimens remaining wn copula, but apparently normal. Legs : coxe yellowish, fore pair brown at base, anterior pairs white-dusted in front; femora yellowish, posterior ones with a black streak below at base, hind femora in female nearly wholly brown; tibie and tarsi blackish yellow. Wings pale yellow, hinder part at base nearly clear. A brownish suftusion at tip, extending inwards as far as the tip of upper branch of 3rd vein, and lower branch of 5th; the colour not quite so dark at absolute tip. Halteres yellowish. Length 9 millim. Described from a male and female, taken ia cop., 22. vi. 05 (types), and a female on 26. vi. 05, all captured by me at Mussoori. A very handsome species. In my collection. 10. Platyura suffusinervis, sp. nov. (PI. I, fig. 9.) 3 2. Head wholly black, ocelli large and distinet. Thorax: dorsum, scutellam, metanotum; and pleure moderately dark shining brown dorsum with rather close dark brown pubescence, and with some bristly hairs towards side margins ; sides of thorax and shoulders yellow. Abdomen: dorsum blackish, pubescent ; PLATYURA. 61 hind margins of segments yellow, the colour extending to, and widening at, the sides ; belly black. Genitalia of male composed of a short, very broad, dorsal plate continued over the sides, a pair of claspers with bilobed second joint and some other elongate slender appendages ; the whole organ brownish yellow, pubescent ; concealed in female, with a pair of small conical moderately thick grey appendages. Legs: coxe and femora brownish yellow, the former with a brown streak on the outer side; tibiz and tarsi brown. Wings pale grey ; all the veins very narrowly suffused. A broad light brown stripe from end of Ist longitudinal vein, passing diagonally just before the middle of the wing to the anal border ; this stripe a little widened in the middle; a narrow similarly coloured stripe from the middle of the 3rd vein diagonally to the middle of the upper branch of the 4th. Length 24 millim. Described from a male and female in perfect condition in the Indian Museum collection, taken in cop. by Lt.-Col. Hall at Sylhet, 10.iv.05. A very distinct species, also conspicuous by its small size and more robust appearance compared with the other Oriental species. 11. Platyura apicipennis, sp. nov. (Pl. I, fig. 8; Pl. ILI, fig. 4.) 2. Head rather dark brown, vertex yellowish; ocellar protu- berance blackish. Antennz with the Ist joint of scape yellow, 2nd brown; flagellum black, Ist joint a little longer than the others. Underside of head, and mouth-parts, yellow. Thorax yellow, semi-transparent ;* viewed from a different direction the dorsum appears pale blackish grey, with a tinge of whitish reflections here and there. Entire surface covered with short black hairs, which are longer and bristly about the side margins above the wing. Scutellum concolorous, with a few hairs; sides of thorax yellowish ; metanotum and metapleure concolorous, slightly dusted with grey. Abdomen moderately shining black, minutely pubescent, 1st segment nearly wholly so, the others each with a broad bright yellow posterior margin, which is widest in the middle (and is probably more or less variable), extending to nearly half the segment in the case of the 3rd; belly mainly yellow. Legs: cox and femora yellow ; tibize brownish yellow ; tarsi black. Wings yellowish; a blackish suffusion towards tip, placed just beyond the upper branch of the 3rd vein, the absolute tip being, however, not quite so dark. Halteres brownish yellow. Length 53 millim. Described from a single male in the Indian Museum from Naini Tal, 6000 feet, 2. vi. 09. * The pin bearing the specimen can be seen through the thorax, 62 MYCETOPHILID A. 12. Platyura affinis, sp. nov. . Very near apicipennis, but the thorax has three distinct black stripes of the usual pattern; sternopleure dusted with blue- grey. The terminal lamelle of the ovipostor can be seen, being small, slightly conical, yellowish. The extreme tip of wing, though lighter than the apical dark suffusion, is still much darker than the corresponding part in apicipennis. Length 5 millim. The single specimen is from Darjiling, 25. v. 10, taken by me. Type in the Indian Museum. 13. Platyura marginata, sp. nov. (PI. III, fig. 3.) 3 9. Head brownish yellow, vertex and back of head brown, palpi yellow. Antennal scape yellow, flagellum blackish, the joints with a greyish tinge on basal half. Z'horaw brownish, three darker dorsal stripes are visible, seen from behind; a con- siderable amount of rather stiff black pubescence over the dorsal surface, becoming bristly at the sides above the wings; sides yellow, pleure rather dark brown. Scutellum and metanotum brown, former yellowish below posterior margin. Abdomen blackish; segments with moderately wide, yellow posterior margins, broadest on 2nd to 5th segments ; abdomen minutely pubescent. Genitalia large and conspicuous ; a large thick upper plate, somewhat narrowed on the apical half, below which is a pair of large, very conical, two-jointed claspers with strong black claws at their tips; a small ventral plate with a row of spines on posterior margin; the whole organ blackish brown, except the apical part of the claspers and the ventral plate, which are yellow. Legs pale yellowish, tarsi black. Wings pale yellowish grey, con- siderably iridescent, tip slightly suffused, the darkening extending nearly to the upper branch of the 3rd vein. Halteres yellowish. Length 43-5 millim. Described from two males from Naini Tal, 6000 feet, 3 and 10. vi. 09. Type in the Indian Museum. A specimen in the same collection, also from Naini Tal, 10. vi.09, is evidently the female of this species. It agrees in all particulars, except that the pleure are not darker than the rest of the sides of the thorax, and that the abdomen is broader, the yellow bands narrower, and the infuscation of the wing-tip less distinct. 14. Platyura flaviventris, sp. noy. 2. Head brownish yellow, vertex black ; antenne black, scape a little yellowish. Thoraw (slightly damaged) blackish, anterior and lateral margins of dorsum yellowish, and apparently with a narrow yellow median stripe. Metapleura with a little grey PLATYURA. 63 dusting; metanotum dark brown, shining. Abdomen dark brown, moderately shining ; base of 1st segment and posterior borders of all the remainder with a distinct, moderately wide, pale yellow band. Belly yellow; genitalia consisting of two small yellow narrow appendages. Legs: coxew and femora brownish yellow, tibiee and tarsi darker. Wangs pale grey, tips pale blackish as far inwards as the tips of the upper branch of 8rd vein and the dth vein. Length 5 millim. Described from one female in the Indian Museum, taken by me, 23. ix. 08, at Darjiling, 6000 feet. 15. Platyura vicina, sp. nov. 2. This species is considerably like P. marginata, differing essentially in the much darker thorax with still darker stripes ; the shoulders being pale yellowish and conspicuous. The scutellum and metanotum are also dark shining brown; the abdominal bands are wider than in P. marginata 2. The basal segment is wholly dark brown. Length 4 millim. Two females in the Indian Museum from Naini Tal, 3. vi. 09. 16. Platyura venusta, Walk. Platyura venusta, Walker, Ins. Saund., Dipt. pt. v, p. 421 (1856). Q. Head brownish yellow, frons blackish, vertex black, with a little whitish reflection in certain lights; scape brownish yellow, flagellum black. Z'horax bluish black, with bluish grey reflections, the dorsum with short black hairs ; apparently some longer stiffer lateral bristly hairs. Viewed from in front three black stripes can be more or less distinctly seen. Sides of thorax bluish black wita whitish grey reflections; scutellum and metanotum con- colorous.. Abdomen black, with short black pubescence ; a creain- coloured, well-defined band to the hind margins of the 2nd, 3rd, and 4th segments. Genitalia inconspicuous. Legs brownish yellow, coxe with whitish reflections ; base of femora, especially the hind pair, blackish; tibie and tarsi blackish ; anterior tibiz with comparatively small spines of unequal length, hind tibie with longer spines of equal length. Wings pale grey, tip blackish; venation normal. Halteres brownish yellow. Length 6 millim. Type. The location of this is unknown. Redescribed from two females in the Indian Museum, from Bareilly, United Provinces, 15-22. iii. 07, and Chittagong, Assam, 14. vil. 08, the latter taken by Lt.-Col. Hall. There are four specimens in the Pusa collection, from Pusa, 16. iy. 07, iv. 08, v. 07, and from Chapra, Bengal. 64 MYCETOPHILID®. There can be no reasonable doubt of the correct identification of this species. Walker described it from the ‘ East Indies.” His. “testaceous stripe on each side” is a thin yellowish line from above the humerus, running below the lower edge of the dorsum, nearly to the wing-base. 17. Platyura octosegmentata, sp. nov. 3. Head yellowish, vertex rather brownish ; ocelli distinct, on a. dark, slightly elevated tubercle. Antenne reddish yellow, also. back of head. Thorax brownish yellow; dorsum with short scattered black bristles and the lateral margins with stronger ones, especially behind the wings; a few below the shoulders, and a few on the posterior corners, each of which latter bears a large round black spot. Scutellum yellow, with a row of numerous. bristles extending over nearly the whole length of the margin. Abdomen distinctly 8-segmented; first two segments wholly yellowish ; remainder more or less marked with brown towards sides and hind margins; belly yellowish ; abdomen above and below with short black pubescence. Genitalia yellowish, incon- spicuous, apparently normal, the second joint of the claspers long and slender. Legs: coxe yellowish; tibie dirty yellowish white, tarsi blackish. Wings pale yellowish grey ; halteres yellow. Length 3 millim. Described from a single male taken by Mr. A. D. Imms, 9.ix.09, at Allahabad, United Provinces, and kindly presented by him to the Indian Museum. The abdomen has normally seven segments in this genus; I do. not know of any exceptions, but refrain nevertheless from estab- lishing a new genus at present for the reception of this species. 18. Platyura ruficornis, sp. nov. 9°. Head rather deep brownish yellow; antenne concolorous,. considerably pubescent; vertex blackish, palpi a little darker. Thorax, scutellum and metanotum concolorous. Dorsum of thorax covered with short black pubescence, which becomes strongly bristly on the margins, above the wings. Scutellum with a row of bristly hairs on posterior margin, with some smaller ones below these, dorsum bare. Abdomen apparently variable; in one example wholly light brown, in two others more yellowish brown, with the posterior parts of the segments more or less black. Legs dirty yellowish; coxe brighter and rather darker, tarsi black. Wings distinctly yellowish ; halteres brownish yellow, Length 3-4 millim. Described from two specimens from Sylhet, Assam,'2. ii. 05 and 30.11.04, and one from Naini Tal, United Provinces, 10. vi. 09. All in the Indian Museum. PLATYURA,. 65 19. Platyura indistincta, sp. nov. 3. Near ruficornis, but the antenne are black, broader, and flatter. A little more yellowish about the abdomen. The anterior branch of the 3rd longitudinal vein much closer to the tip of the auxiliary vein than in ruficornis. All the veins behind the 3rd longitudinal very indistinct, though perceptible under close observation. Genitalia normal, black, pubescent; 1st joint comparatively large, the 2nd consisting of a black hook. Length 4% millim. Described from one male (type) in the Indian Museum, from Kurseong, 20. vi. 10 (Dr. Annandale). 20. Platyura longifurcata, sp. nov. 3 2. Head mainly black. Proboscis, palpi, and base of antenne brownish yellow. Zhorav rather dark brownish yellow ; the usual three darker stripes present but indistinct, the whole dorsum with rather thick black pubescence. Scutellum and metanotum concolorous ; sides of thorax barely lighter. Abdomen blackish, pubescent, hind margins of segment dull yellowish ; belly yellowish. Genitalia consisting of a pair of fleshy bilobed forceps, the upper piece larger and longer than the lower one. Legs dirty yellow, tips of tibiz barely darker. Wings grey, veins distinct ; the 4th longitudinal vein forking very near its base, the petiole in one example (éype) less than a fourth, in the other example about one-sixth, the length of the branches. Halteres blackish. Length 43 millim. Described from two specimens from Kurseong, 24-26. iii. 10 (Dr. Annandale). 21. Platyura funerea, sp. nov. 9. Head nearly black, palpi pale yellow, long and thin; scape of antenne bright reddish yellow, flagellum black ; a small trans- verse ridge over the base of each antenna. Ocelli two only, very distinet. Thorax dull black, shoulders greyish, pubescent, bristly towards side margins ; a little yellowish above the pleure in front of the wings. Sides of thorax dark brown or blackish; scutellum and metanotum dark brown. Abdomen blackish, pubescent; the basal part of the middle segments rather brownish. Legs pale yellowish, coxe with black hairs at tip, tibiee brownish, tarsi black. Wings yellowish; halteres brown. Length 4 millim. Described from a single example in the Indian Museum collection from Gangtok, Sikkim State, 6150 feet, 9. ix. 09, Three ocelli is the normal number, but I vefrain from establishing a genus for this species, as [ am unaware whether any other species possesses less than the normal number. E 66 MYCETOPHILID”. 22. Platyura flavomarginata, sp. nov. 3. Head black, palpi yellow, scape, base of 1st flagellar joint,. and underside of one or two succeeding joints, brownish yellow, rest of flagellum black. Thorav dark, moderately shining mahogany-brown, with a little grey dusting viewed from certain directions; indistinctly marked with three stripes; lateral margins a little brown, shoulders yellow. Scutellum, metanotum, and pleure dark brown. Abdomen black, pubescent, posterior margins of segments rather broadly yellow, lst segment and tip wholly black. Belly similar. Genitalia distinct, black, hairy, having a pair of pointed claspers and a smaller yellow internal organ. Legs pale yellowish, tibie brownish yellow, tarsi black. Wings pale yellow ; halteres brownish yellow. Length 43 millim. Described from a single male in the Indian Museum from Naini Tal, 6000 feet, 3. vi. 09. 23. Platyura fumipes, sp. noy. Head yellowish. Proboscis blackish above at the base. Frons shining dark brown, with a median impressed line; back of head still darker brown. Antennal scape vellow, flagellum wholly black. Zhorax: prothorax yellow, distinctly delineated from the rest of the thorax, which is blackish. Black hairs on the yellowish shoulders. Dorsum dark grey, with rather thick but short black hairs; the usual three black stripes, a little indistinctly outlined but easily visible when seen from behind. Viewed from in front the dorsum appears mainly light grey. Sides of thorax blackish, with a slight grey reflection. Abdomen blackish, with short pale hairs, posterior borders of segments distinctly but not widely pale yellowish. Belly similar. Legs: coxse brownish yellow, with a short blackish streak at the tip, on anterior side on the fore pair, on outer side on posterior coxe. Femora dirty yellow, a little black at the base and tips, especially on the hind pair. Tibiz and tarsi pale smoky yellow. Wings grey; veins very distinct, black, venation normal. Halteres brownish yellow. Length 8 millim. Described fron one male from Peradeniya, Ceylon, 22. vii. 10. Type in the Indian Museum. Genus ISONEUROMYIA, gen. nov. This genus approximates most closely to Platyura. The characters are as follows :— Head : antenne considerably flattened, rather more so than in Platyura, scapal joints cup-shaped, subequal ; the fourteen flagellar joints subequal, the last one a little longer, the first much narrowed. ISONEUROMYIA, 67 at base. Palpi elongate, incurved. Ocelli very distinct, placed on a vertical protuberance, the outer ones very large, the middle one a little below the others. Wings with all the veins equally and very strongly developed, except the almost obsolete base of the 4th vein. Auxiliary vein ending before the middle of the wing, just beyond the base of the 8rd longitudinal; subcostal cross-vein placed just beyond the humeral cross-vein. The 1st longitudinal veiu thickly spinose with several rows of small spines, the remaining veins each with a single row of microscopic spines. Posterior cross-vein in its normal position at proximal end of the coalesced portions of the 3rd and 4th veins. The 5th, 6th, and 7th veins equally strong, arising close together near the base of the wing, this strength of the veins being the chief generic character. Range. Assam, Ceylon. 24. Isoneuromyia annandalei, sp.nov. (PI. ILI, tig. 5.) 2. Head mainly blackish, frons bare, with blue-grey dusting, whitish above the antenne, ocellar protuberance blackish. Some stiff black hairs behind the head. LEpistome and palpi from creamy white to brownish yellow. Antenne yellowish to reddish brown, a little blackish in some specimens. Proboscis brown. Thorax blackish. Dorsum with blue-grey dusting, a median black (not always very distinct) stripe which may be widened in the middle and which dies away towards the posterior margin. Anterior margin of thorax, just below dorsum, light creamy yellowish, the colour extending narrowly laterally. Sides of thorax brownish, pleure with white or bluish-white dusting, also the metanotum. Whole thorax shortly pubescent, some stiff bristles below the brownish humeri, and on the lateral margins of the thorax. Scutellum with stiff hairs on the hind margin. Abdomen black, minutely pubescent, base of each of first five seements with a somewhat narrow but distinct yellowish band, which appears snow-white if viewed from in front, last segment all black. Genital organs small, oval, creamy yellow. Legs: cox yellowish, with some stiff hairs, black at tips, fore pair blackish on outer side. Femora brownish yellow, irregularly blackish at base and tips, with short black hairs, which are generally stronger on the upper side, giving it a blacker appearance. In one example all the femora nearly wholly black. ‘Tibi and tarsi blackish. Wings pale grey, rather glassy in appearance, distinctly iridescent. All the veins very distinctly brown, and all of equal strength (except basal part of 4th longitudinal). A brown suf- fusion towards the wing-tip, darkest on its anterior part, commencing on the costa, exactly by the upper branch of the 3rd vein, and extending hindwards and outwards in gradually diminishing intensity, sometimes retaining its dark colour as far as the hind margin. A narrow brown suffusion over the coales- cence of the 3rd and 4th veins and along the faint basal part of F 2 68 MYCETOPHILID#, the 4th vein. The markings vary within reasonable limits. Halteres clear orange-yellow. Length 9-10 millim. Described from a nearly perfect female in the Indian Museum from Sylhet, 27. v.05 (Zt.-Col. Hall, type), and four females in my collection from Kandy, Ceylon, v. and vii. 09 (Z. E. Green). Apparently the largest known Oriental Mycetophilid. Subfamily SCIOPHILIN A. This subfamily is represented by a well-circumscribed set of species numerously distributed throughout the world and possess- ing a characteristic cell formed by the upper branch of the 3rd longitudinal vein being so short, so upright, and placed so soon after the origin of the vein, as to be almost parallel to the upright short basal section of the vein, thus enclosing a more or less four- sided cell, which I propose to term the “ sciophiline cell,” from its being peculiar to this group. Anterior cross-vein present, subcostal cross-vein present or absent, posterior cross-vein always absent, ‘I'wo or three ocelli present, always remote from the eye- margins except in one (non-Oriental) genus, Hudicrana, Loew. Table of Genera, The 4th longitudinal vein forks at or a little beyond anterior cross-yein ; fork of 5th longitudinal vein beyond fork of 4th .. ScropHina, Me., p. 68. The 4th longitudinal vein forks at least the length of the anterior cross-vein beyond the latter. The 38rd longitudinal vein very sinuate. Auxiliary vein ends free or in the costa beyond the sciophiline cell. Three ocelli, the middle one only a little smaller than the laterals ...... PotyLepra, Winn., The 3rd longitudinal vein straight or gently [p. 78. curved. Auxiliary vein ends either in the costa, in the Ist longitudinal or free. Ocelli two or three; when three, placed together in a triangle in middle of frons, the middle ocellus VGRY MMMM wonton + sc a.c.- ete ual see, eee Mycomytia, Rond., p. 70. Genus SCIOPHILA, My. Sciophila, Meigen, Syst. Besch. 1, p. 245 (1818). Lastosoma, Winnertz, Verh. zool.-bot. Ges, Wien, xiii, p. 748 (1863). GeEnorypn, S. hirta, Mg., as designated by Curtis (British Ento- mology, p. 641). SCIOPHILA,. 69 Head small, spherical, flattened in front, placed low upon the thorax; eyes oval, slightly emarginate at the base of the antenna, almost reniform ; ocelli three in number, arranged in a flattened triangle upon the broad front or more rarely upon the vertex, the middle one only slightly smaller than the laterals. Palpi incurved, four-jointed, the 1st joint very small, the 2nd and 3rd subequal, the last longer than the others taken together ; antenne pro- jecting forward, arcuated, somewhat compressed, 16-jointed, the two basal joints cupuliform, hairy. Thorax oval, highly arched ; mesonotum long and thickly haired, not setose ; scutel- lum very small; halteres with short petiole and elongate knob. Abdomen seven-segmented, cylindrical, somewhat constricted at the base; hairy in the male, with blunt extremity and small forceps. Legs moderately long ; the tarsi of the fore legs double the length or rarely more than double the length of the tibie; the tibie with spurs and with lateral sete, the fore pair with one or two, the middle pair with three and the hind pair with four rows, the inner rows with only few and weak sete. Wings elongate oval, with rounded base, longer than the abdomen, hairy ; hairs some- times visible to the naked eye. The costa extends considerably beyond the posterior branch of the 3rd longitudinal vein, but does not reach the tip of the wing. The auxiliary vein ends at about the middle of the wing; the 1st longitudinal is long, nearly straight, the 3rd originating from it before the middle of the wing and at a right angle, thence curving gently to the border ; the upper branch of it is very short, nearly upright or moderately oblique and placed more or less parallel with and quite close to the erect basal portion of the vein, so as to enclose a quite small oblong, square or rhomboidal cell. This cell is characteristic of the sub- family and may be known as the sciophiline cell,* and the anterior cross-vein is always at its lower basal corner. The 4th longi- tudinal vein forked near the base, the 5th forked at or beyond the middle; the posterior cross-vein absent, 6th longitudinal in- distinct and incomplete. Fig. 9.—Larve of Sciophila. Range. Including Lasiosoma, Winn., which Johannsen considers synonymous, the present genus occurs in Europe, Australia, North and South America, and the West Indies, but it has not been previously recorded from the East. * This is an original suggestion as a name for this cell, which does not appear to have been previously named, yet reference to it is frequently necessary. It might technically be considered the marginal cell but it is never referred to thus. 70 MYCHLOPHILID®, Life-history. The larve of most species of Sciophila live not in fungi but on the underside of the pileus, protected by a coarse webbing spun by them. They are more elongate than most Mycetophilid larvee, and the pupa is encased in a close cocoon of silk. A peculiarity of the larvee of some species of this genus is their vivid luminosity, Hudson mentioning a New Zealand species which gave out enough light to be easily visible several feet away. In Kertész’s Catalogue of the Diptera, Lasiosoma is admitted as a separate genus and Mycomyia (Mycomya), Rond., given as a synonym of Sciophila. Winnertz’s Scrophila is an incorrect inter- pretation of the genus, which was established by Rondani in 1856, and all the species placed by Winnertz in his Lasiosoma fall into the present genus. Winnertz’s Sciophila= Mycomyia, Rond. 25. Sciophila bicolor, sp. nov. (PI. I, fig. 10.) @. Head black, palpi yellowish ; scape and base of flagellum reddish yellow, the remainder black. Thoraw wholly black, dorsum shining, and with rather long, somewhat shaggy, yellowish hairs, which extend a little over the sides, shoulders, humeri, scutellum, and metanotum ; the scutellum also with a row of distinct long stiff yellow hairs. Abdomen wholly black, rather shining, with short brown hairs; belly similar. Legs mainly yellow, narrowly blackish at junction of coxa and femora; cox with moderately long soft yellow hairs ; hind femora rather broadly black at base and tip ; tibiz barely darkened towards tips; tarsi black. Wings pale yellowish, considerably iridescent, the sciophiline cell exactly square, small, placed immediately below the upper branch of the 3rd vein. Halteres yellow. Length 3 millim. Described from two females in the Indian Museum from Darji- ling, 7000 ft., 7 and 8. vili.09 (Paiva) (including type), and two females, 28. v. 10 (Brunettz). Genus MYCOMYIA, Pond. Mycomya, Rondani, Dipt. Ital. Prod. i, p. 194 (1856). Sciophila, Meigen (part.). ? Sciobia, Loew, Bernst. u. Bernst.-fauna, p. 33 (1850). Sciophila, Winuertz, Verh. zool.-bot. Ges. Wien, xiii, p. 707 (1863). Empheria, Winnertz, loc. cit. p. 738. ? Cnepheophila, Philippi, Verh. zool.-bot. Ges. Wien, xv, p. 618 (1865). Neoempheria, Osten Sacken, Cat. N. Amer. Dipt. p. 9 (1878). GeENoryPe, MW. marginata, Mg., designated by Rondani. Head small, flattened in front, placed low upon the thorax ; eyes elongate oval, or round; emarginate at the base of the an- tenn; ocelli two or three in number, placed close together upon a rounded, frequently blackened area; when three ocelli are MYCOMYIA. 71 present they are placed close together in a triangle, the median one very minute; proboscis very short. Palpi incurved, four- jointed, the 1st joint very small, the 2nd somewhat longer, but shorter than the third, the 4th usually as long as or longer than the three preceding taken together ; face more or less wide. Antenne projecting forward, arcuate, longer than the thorax in the male, subequal in the female, somewhat compressed, 16-jointed, the scape differentiated, the first two joints cupuliform, setose at the tip; the flagellar joints cylindrical, pubescent. Thorax highly arched, ovate ; scutellum small, semicircular in outline, metanotum ‘steep. Abdomen slender, seven-segmented, constricted at the base, usually somewhat clavate, particularly in the male, de- pressed behind, in the male ending in a small forceps, in the female with a short ovipositor terminating in two small lamellae. Legs: coxe elongate, somewhat setose; legs long and slender; femora ciliated on the flexor surface ; tibiz with lateral sets, the fore and middle pairs with two, the hind pair with three ranges, the inner row particularly delicate. Wings microscopically setu- lose, somewhat projecting beyond the tip of the abdomen. The costa ends at the tip of the wing or a little before it. The auxiliary vein ends either free (sometimes indistinctly), or in the costa, or in the Ist longitudinal vein. The 1st longitudinal straight or but little curved, the 3rd beginning at a distinct angle, thence straight or nearly so. The sciophiline cell of variable length according to the species. The 4th longitudinal vein forked at or before the middle of its length beyond the anterior cross- vein; posterior cross-vein absent; 5th longitudinal vein widely forked at about the middle of the wing, the 6th and 7th incomplete and indistinct. Range. Europe, the Orient, Australasia, North and South America, West Indies, Africa. It occurs also in Baltic amber and in recent copal from Zanzibar. Life-history. Nothing seems to be known of the metamorphosis of any species of this genus, except that the larvee have been found in fungi and rotting wood. The species placed in the Sciophila of Winnertz belong here. Neoempheria, Os. Sac., is hardly a valid genus and is sunk in Mycomyia. Two queried synonyms are culled from Johannsen’s work on this family. Table of Species. 1. Auxiliary vein ends free, abruptly ; sub- costal cross-vein present ............ Jlaviventris, sp. ., p. Auxiliary vein ends either in costa or Ist longitudinal vein; subcostal cross- vein present or absent .............. 2. Auxiliary vein ends in costa; subcostal CTOSS-VeIN PTESGHE . fe). 6. eek ce es 3. Auxiliary vein ends in Ist longitudinal ; subcostal cross-vein absent ........-. 6. 72. die MYCETOPHILID®. 3. Wing with distinct markings.......... 4. Wane auiiteclear 45)... = ts sise «pte ieee 5. 4 (a). Basal third of wing infuscated, and with a band beyond the middle .. bifascipennis, sp. n., p. 72- (6), Apical fourth of wing infuscated, also the posterior margin and the sciophi- line cell, both slightly .......... tinctipennis, sp. n., p. 74. (c). Apical and hind margins of wing in- fuscated, also the mner and outer sides of the sciophiline cell ...... ferruginea, sp. n., p. 74. (2). Tip of wing broadly infuscated, also a band before the middle ........ basalis, sp. n., p. 78. 5 (a). Thorax yellowish, with three distinct blaclestripes. ioe aek oe Eire so. trilineata, sp. n., p. 75. (6). Thorax brownish yellow, with three faint Maw Swipes. Lysine el as «cee indefinita, sp. n., p. 76. (c) Thorax dark grey, slightly dusted TRC NAOLEL EAs tec Ge aude ral wate tee indica, sp. n., p. 76. 6. Thorax all brownish yellow, two very narrow median brown lines.......... Jlavithorax, sp. n., p. 77. Thorax with all blackish dorsum except margin and shoulders; 3rd longitudinal vein curved conspicuously downward , cwrvilinea, sp. n., p. 77. From the insufficiency of the description, and no mention being made of the veins, it is impossible to include in this table Doleschall’s tropica, which I should have been glad to add as it is the only previously described species from the East, but it has not yet been found in India. 26. Mycomyia flaviventris, sp. nov. 3 2. Head: frons and vertex brown, antennal scape yellow, flagellum dark brown, with greyish pubescence. Underside of head, and the palpi, reddish brown. TZhoraa yellowish, paler on shoulders. Dorsum with three practically contiguous broad dark brown stripes, the median one reaching the anterior margin. Bristly hairs on dorsum and moderately strong bristles about the lateral margins. Scutellum yellow, with four strong bristles on hind margin, outer pair the Jarger, metanotum and metapleure a little darker. Abdomen: upperside dark brown, belly yellowish. Genitalia enclosed within a large V-shaped ventral -plate, the exact structure not visible; dark brown. Legs: coxe yellowish, femora much lighter, tibie dirty yellow, tarsi blackish. Wings nearly clear, halteres brownish. Length 3 millim. Described from a single male in the Indian Museum from Kurseong, 5000 ft., 3. vi. 08, taken by Dr. Annandale; and from a single female, which I refer to this species, from Ohiya, Ceylon, 1.07 (Green), in my collection. 27. Mycomyia bifascipennis, sp. nov. (PI. III, fig. 6.) 3. Head wholly brownish yellow, with short black hairs; palpi MYCOMYIA, 73 and ocellar triangle blackish. Vhorax brownish yellow, with short black hairs and stronger bristles. Anterior margin narrowly brown, the colour forming a median stripe, not attaining the hind margin, and also extended laterally from the shoulders. Bristles along sides of dorsum rather strong and numerous, also a strong one on each posterior corner, and a pair on the tip of the scutellum. Pleure and metanotum brown. Abdomen yellowish, with short black pubescence ; 1st segment all yellow, remainder with posterior half of each segment black. Genital organs very con- spicuous and peculiar: a high hood-shaped dorsal plate extending downwards at the sides, a slightly curved, very large ventral plate produced at the tip into two long finger-like projections ; a pair of elongate appendages emerge from the inner cavity, bearing oval, lainella-like tips, and below these are traces of a pair of slender finger-like appendages nearly as long.* The whole organ light brownish yellow, pubescent. Legs wholly brownish yellow, pubescent, tips of tarsi darker. Wangs pale grey with two brown streaks. The first begins on the costa just betore tip of subcosta, running straight across the wing, widening in the middle sufficiently to reach fork of the 4th vein, afterwards narrowing again and finally widening on hind margin. ‘The second begins on the costa just before the tip of the Ist vein, running across the wing to the hind margin, leaving the tip ot the wing broadly clear. The sciophiline cell is nearly three times as long as broad, the base of the 3rd vein bisinuate, the cross- vein forming the outer side of the cell broadly suffused. Base of wing slightly brown. Halteres pale yellow. Length 4 millim. Described from a male (type) from the Kumaon District, 5700 ft., vu.1909 (Jmms), and a male in my collection from Maskeliya, Ceylon (Green). Type in the Indian Museum. 28. Mycomyia basalis, sp. nov. (PI. J, fig. 13.) 3. Near M. tinctipennis, Brun.(infra). Thorax: dorsum brown- ish yellow, with some long yellow hairs and black bristly ones. Two dorso-central rows of black bristly hairs, of which at least the hinder three pairs are of larger size than the majority of those scattered over the dorsum. ‘Two strong bristles on posterior corners, others irregularly placed on lateral margins, around the base of the wing, and a pair of rather strong apical ones on the scutellum. Abdomen with the first segment bright yellow, 4th dull yellowish; remainder black, with barely perceptible hind margins. Belly mainly yellowish. Genitalia large and conspicuous, brownish yellow, pubescent ; a very short dorsal plate, as wide as the ultimate abdominal segment, under which it is nearly hidden ; * These are not shown in the figure. 74 MYCETOPHILID &, a large pair of claspers, elongate, conical, much flattened, and bisinuate, produced on the lower side into a finger-like appendage ; a globular piece between the claspers above, just beyond the dorsal plate, and apparently some intermediate appendages. Wings marked as in tinctipennis, but the apical spot much darker, and the proximal spot over the sciophiline cell is extended to a rather dark, irregular brown streak reaching hind margin of wing. Length 3 millim. One example from Bhowali, 5700 feet, Kumaon, July 1909 (A. D. Imms). Type in the Indian Museum. Since the description of the species, the abdomen of the type, and only specimen, has become detached and lost. 29. Mycomyia tinctipennis, sp. nov. (Pl. I, fig. 11.) Head yellow; antennal scape brownish yellow, about the basal half of flagellum yellowish brown, changing to black towards tip; palpi blackish. TZhorav (somewhat crushed) uniformly yellowish brown; lighter at sides; pleure rather dark grey. Dorsum with some bristly hairs, apparently more or less longi- tudinally arranged. -Abdomen: basal half blackish above, yellowish below (remainder missing). Leys: coxe and femora pale yellow, tibiz and tarsi pale blackish. Wings pale yellowish grey; slightly suffused over distal half; over the cross-veins, enclosing the sciophiline cell, which is approximately square; faintly also behind the 5th longitudinal vein. Halteres yellow. Length probably about 34 millim. Described from a single specimen from Kurseong, 3. vii. 08 (Annandale). Type in the Indian Museum. The thorax is slightly crushed, and the apical half of the abdomen is missing, so that the sex is uncertain. I would not have described the species but that the wing markings are probably sufficient to distinguish it. 30. Mycomyia ferruginea, sp. nov. (Pl. I, fig. 12.) 3 2. Head wholly yellow, except palpi, a narrow line from above antenne to behind head, flagellum, and eyes, all of which are black. Scape yellow with some bristly hairs above. Thorax yellow. Dorsum with four dark brown equidistant stripes, the outer ones placed nearly on the sides (type specimen). They con- verge somewhat towards the posterior margin and are joined behind into two pairs by short cross-lines. In the second example there is a distinct additional median narrow line between the two inner stripes, of which in the type there is a trace only near the fore border. Sides of thorax, scutellum, and metanotum concolorous in type; paler yellow in second specimen. ‘T'wo distinct dorso- MYCOMYIA. 75 central bristles, a double row of median microscopic bristly hairs, and an irregular row (duplicated here and there) of bristly hairs of various lengths along the black stripes. Some moderately long bristles about the shoulders and humeri, on the posterior corners of dorsum, aud several distinct bristles on the lateral margins above the wings. Small bristly hairs occur here and there irregularly. Scutellum with two pairs of strong spiny bristles on posterior margin, Abdomen orange-yellow. In one example (type) there is a black dorsal stripe of moderate width, with a tendency to enlargement on posterior margins. _ Whole abdomen lightly covered with short yellow hairs. Lateral edges of dorsum narrowly black; belly orange-yellow. In the second specimen the black colour is not so distinctly in the form of a line, being more irregular and forming a distinct band on the penultimate segment. Genitalia in both sexes small, withdrawn. Legs: in type, orange- yellow (in second example, pale yellow); tibie in both specimens pale brownish yellow towards tips; tarsi black. Wangs pale grey, yellowish from costa to 3rd longitudinal vein. Inner cross-vein, and the upper branches of Ist and 8rd veins distinctly but narrowly suffused.* A slight darkening at wing-tip, at the forking of the 4th vein (type) or from thence along the hind margin (2nd specimen). Halteres yellow. Length 4-43 millim. Described from two males in the Indian Museum, one taken by Dr. Annandale at Kurseong, Darjiling, 3. vii. 08, the other from Caleutta, 11. ii. 90, and one female from Darjiling, 29. v. 10, taken by me, also in the same Museum. In spite of the additional median thoracie line and the slight difference in the disposition of the black colour on the abdomen, and the deeper general colour of the type, I believe that the two specimens are conspecific. 31. Mycomyia trilineata, sp. nov. 3. Head: frons, vertex, back of head and flagellum, black ; face and epistome, palpi and scape bright yellow. Thoraa, scutel- lum, and metanotum pale yellowish. Three brown stripes of the usual pattern, the median one the longest, reaching fore border, and very narrowly divided. Seen from behind, the stripes, and also the pleure, have a slight bluish-grey tinge. Bristly hairs, as in M. ferruginea. The minute bristly hairs of the dorsum, irregu- larly placed; they also line the edges of the dark stripes, which themselves are bare. Abdomen: dorsum mainly black, posterior margins of first five segments broadly yellow ; belly yellow. Sur- face of abdomen with black hairs which are stronger towards tip. Genitalia composed of a large dark semicircular plate, the claspers and appendages slender, yellowish. Legs pale yellow ; posterior femora with a row of well separated, rather long hairs below; tibie brownish yellow; tarsi black. Wings pale grey, iridescent : * The sciophiline cell 2-23 times as long as broad. 76 MYCETOPHILID ®, sciophiline cell one-and-a-half times as long as broad. Halteres yellow. Length 34 millim. Described from two specimens in the Indian Museum, from Simla, 7000 feet, 10. v. 09 (Annandale). 32. Mycomyia indefinita, sp. nov. 3 and (?) 9. Head brownish on vertex and frons ; proboscis and palpi yellowish, the latter a little darker. Antennal scape bright yellow, flagellum black, with whitish pubescence, basal half of Ist joint yellowish. Thorax brownish yellow, the three usual stripes distinct but not conspicuous. Some bristly hairs towards the sides and posterior margins of the dorsum. Sceutellum and metanotum concolorous; sides of the thorax a little more yellowish. Abdomen blackish, base of some of the segments yellowish. Genitalia enclosed in a large cavity, and presenting two fan-shaped pieces with pubescent edges and a pair of smaller club-shaped organs. Legs pale yellowish, the tibiz and tarsi faintly blackish. Wings clear grey, venation normal. Halteres pale yellowish. Length 3 willim. Described from one male and another specimen from Darjiling, 29. v.10, taken by me, and now in the Indian Museum. In the second specimen, there are two flat spatula-shaped pieces which may be the female lamellw terminating the short ovi- postor, but as the organs in this specimen are much withdrawn it is impossible to be sure of the sex. 33. Mycomyia indica, sp. nov. 3 9. Head: frons, vertex, and back of head black; head in front below antennee, and palpi, yellow. Antennal scape and base of flagellum bright yellow, remainder black. Zhorax primarily light yellowish brown, with a distinct but slight violet-grey dust on dorsum. A median brown stripe usually present and faint traces of a very elongated oblong mark narrowly defined with pale brown, on each side of the median stripe, all the lines microscopi- cally punctuated with bristly hairs. Shoulders yellowish, the colour extending posteriorly more or less, occasionally the whole dorsum brownish yellow. Sides of thorax mainly brownish yellow, pleure with violet-grey dusting. Scutellum and meta- notum brownish yellow, varying in shade, generally with a little violet dusting, the metanotum sometimes with a dark spot on each side at the base, and a larger one on the lower margin. Abdomen brown, with short black hairs; posterior margins of seoments broadly yellow. Genitalia of male moderately large, pubescent, a large upper and lower dark coloured plate, united at the sides, enclosing a longer and a shorter pair of thin yellow claspers, with, apparently, some smaller intermediate organs; in MYOOMYIA. 77 female, inconspicuous, narrow, yellow. Legs pale yellow, a little blackish about the junction of the coxze and the femora; the tibia blackish yellow; tarsi black. Wengs pale grey, slightly vitreous and extremely iridescent, the sciophiline cell about one-and-a-half times as long as broad, upper side distinctly longer than lower. Halteres pale yellow. Length 33-4 willim. Described from five males and one female in the Indian Museum taken 10-12. v. 09, by Dr. Annandale, at Simla and Phagu. 34, Mycomyia flavithorax, sp. noy. ¢. Head: vertex dark brown; proboscis light brown, palpi blackish. Antennal scape yellow, flagellum black, with whitish rather thick pubescence. 'horax light brownish yellow. A pair of interrupted incomplete median brownish stripes, with a shorter and more distinct one on each side towards the wing. All the dorsum with long black hairs, stiffer ones towards the margins. Scutellum concolorous, with four stiff bristly hairs on the hind margin. Sides concolorous, metanotum blackish. Abdomen blackish; base of most of the segments yellowish, especially towards the sides. Belly with the basal half of the segments yellowish, hinder half blackish. Genitalia large, conspicuous ; each clasper with a large basal subquadrate piece, with a narrow finger-like hook at the tip. There are also some other elongate appendages ; the whole organ brownish yellow, moderately pubescent. Legs: coxa and femora yellowish, tibie# and tarsi pale blackish. Wings pale grey. Venation normal. Halteres yellowish. Length 23 millim. Described from a single male in the Indian Museum collection taken by Dr. Annandale at Darjiling, 25. v. 10. 35. Mycomyia curvilinea, sp. nov. 3. Head: vertex brownish grey. Proboscis and palpi brownish yellow. Antennal scape and base of Ist flagellar joint yellowish, the remainder black. Thorax rather dark brown, with numerous long black hairs, and more bristly ones towards the lateral margins; shoulders rather broadly reddish or yellowish. Scutel- lum concolorous, with four large bristly hairs on the hind margin. Sides of thorax and metanotum concolorous. Abdomen mainly blackish, the bases of the segments yellowish. Belly mainly yellowish. Genitalia large and conspicuous ; a large basal joint to each clasper, ending in two finger-like appendages ; between the basal joints, a pair of long narrow forceps, two-jointed, both elongated, the second consisting of a long horny hook-like process. There is an apparently more or less horny straight flat narrow piece projecting from below the dorsal plate (this latter of moderate size, oblong, yellowish, pubescent) ; slightly enlarged at 78 MYCETOPHILID A, the tip, where it ends in two minute points. Legs: cox and femora pale yellowish, tibize and tarsi pale blackish. Wings pale grey. The 3rd longitudinal vein considerably bent down on the distal portion, ending at or just above the tip of the wing. Halteres yellowish. Length 3 millim. Described from one male (type) from Tonglu, Darjiling District, 10,000 ft,, 22.iv.10, taken by Mr. C. W. Beebe; also from a second male taken by me at Darjiling, 7000 ft., 29. viii. 10. Type in the Indian Museum. An additional male has a wholly blackish dorsum to the abdomen, and the genitalia, though too contracted to be properly visible, appear to be similar ; some finger-like appendages at least being visible. It is in the Indian Museum collection, taken by Dr. Annandale at Kurseong, 22. vi. 10. Though possibly distinct the three specimens appear to represent but one rather variable species. Genus POLYLEPTA, Winn. (PI. I, fig. 14.) Polylepta, Winnertz, Verh. zool.-bot. Ges. Wien, xiii, p. 745 (1863). Gunorypen, P. undulata, Winn., by designation of Johannsen (Gen. Ins., Fasc. 93, p. 43). Head small, flattened in front, placed low upon the thorax; eyes oval, somewhat emarginate at the base of the antenna ; ocelli three in number, placed in a more or less curved line on the broad front, the middle one smaller than the laterals. Palpi incurved, four-jointed, the 1st joint very small, the 2nd and 38rd subequal, the last one longer than the others taken together. Antenne pro- jecting forward, somewhat compressed, 16-jointed, the basal joints cupuliform, the flagellar joints cylindrical; pubescent. T'horaw very short, highly arched ; mesonotum high, scutellum small ; halteres with elongate knobs. Abdomen long and slender ; in the male some- what clavate; genitalia small ; abdomen in the female cylindrical, constricted at the base, seven-segmented. Legs long, tibize with spurs and with lateral sete. Wings elongate oval, not longer than the abdomen, with microscopic hairs. Costa ends at or just before tip of wing. Auxiliary vein ends before middle of wing, some- times in the costa, sometimes free. The Ist longitudinal nearly straight, the 3rd bisinuate, sometimes very considerably so, beginning at about one-third of the wing. Sciophiline cell small ; the 4th and 5th longitudinal veins forked widely at about half their length ; posterior cross-vein absent, 6th and 7th veins incomplete but long. Range. Only previously known from Europe, with a single species from North America. One is recorded from Baltic amber. Life-history unknown. POLYLEPTA. TD The two Indian species are very closely allied and may possibly prove identical. Their differences are as follows :— Length 5 mm. ; sciophiline cell square ........ dubivsa,sp.n.,p.79. ‘Length 3 mm.; sciophiline cell nearly twice as DPM en eds Spa ctidan te ds bi do lno am: tincerta,sp .n.,p.79. 36. Polylepta dubiosa, sp. nov. 3. Head: vertex blackish grey; proboscis and palpi rather bright brownish yellow. Antennal scape bright yellow, joints subequal ; flagellar joints brown (except base of Ist), cylindrical (ist a little longer), all with rather thick pale pubescence. Thorax rather dark brown, with a slight claret tinge, some long yellow hairs around the margins, and the whole dorsum covered with very short and sparse yellow hairs irregularly placed. Shoulders broadly bright yellow, a brown elongate spot on each side of the prothorax. Scutellum brownish, with a row of numerous hairs on the hind margin; metanotum concolorous. Abdomen black, with moderately thick pale pubescence. A pale brownish yellow basal band on each segment after the 1st, which, with the ultimate segment, is wholly black, the yellowish bands being continued on the underside. Genitalia consisting of a dorsal plate, claspers with a comparatively large basal joint ; an inter- mediate pair of small bilobed appendages, and possibly other inner organs. Legs: coxe and femora yellowish, trochanters and tips of femora a little blackish, tibia and tarsi pale blackish. Wings pale grey ; venation in accordance with the generic characters and figure by Johannsen (Gen. Ins., Fasc. 93, pl. 4, fig. 6). Halteres pale yellow, clubs blackish. Length 5 wmillim. Described from one male from Mundali, Jaunsa Division, Dehra Dun District, 9000 ft., 10. v.10 (C. W. Beebe). Type in the Indian Museum. Only two ocelli are apparent in the present specimen, yet in other respects it agrees with Polylepta. 37. ? Polylepta incerta, sp. nov. 29. Head: vertex dark brown; ocelli very distinct, yellow; proboscis brown, small; palpi pale yellow. Antennal scape and base of Ist flagellar joint brownish yellow, remainder black. Thorax brownish yellow ; three conspicuous broad black stripes of the usual pattern, the median one attaining the anterior margin. Dorsum with irregular short and long hairs ; two strong bristly ones above the wing, and four on the border of the scutellum, which is black on the dorsum and yellow at the base and around the whole margin; metanotum and pleure blackish brown. Abdomen blackish, with pale pubescence, more or less yellowish about the 80 MYCETOPHILID ®. apical half of the first three segments. Belly yellowish. Legs pale yellowish, trochanters a little blackish ; tibiz and tarsi faintly blackish. Wings pale grey, considerably iridescent ; venation normal. Length 3 willim. Described from a single specimen in the Indian Museum from Mundali, Jaunsa Divison, Dehra Dun District, 12. v.10 (C. W. Beebe). Apparently the example is a female; the genitalia are much withdrawn, but two small rounded pieces can be seen, which seem to be terminal lamelle. Otherwise, if the specimen is a male the genital organs differ in shape considerably from typical forms. Subfamily MYCETOPHILIN A. Table of Genera. 1. Proboscis conspicuously elongated into SAONS DPMS ect tare reek Beebe ieee GnorisTE, Mg., p. 82. Proboscis never thus elongated ...... 2. 2. Auxiliary vein ending in costa and at least half as long as Ist basal cell .. 3. Auxiliary vein not ending in costa; when long, ending in Ist longitudinal vein or with its end free; generally short, with eng trees iiajiek da daeateiee 12. 3. Basal section of anterior branch of 4th longitudinal vein wanting .......... Oponropopa, Aldr., p. 89. Basal section of anterior branch of 4th longitudinal vein present .......... 4, 4, Subcostal cross-vein present ........ 5. Subcostal cross-vein absent .......... 8. 5. Basal section of 8rd longitudinal vein many times longer than anterior cross- vein. (The 5th longitudinal vein forks HiapASe Of WING.) sc. se naeie ALLACTONEURA, Meij., Basal section of 3rd longitudinal vein [p. 88. barely (if at all) longer than anterior CQOSS=VEIN eins. 2 Sas ies ee one eee 6. 6. Auxiliary vein enters costa very near the origin of the 5rd longitudinal vein. LEepromorpuus, Curt., A distinctly appreciable space between [p. 84. the tip of the auxiliary vein and the origi of thevard Veln . +... osm as 7. The 4th longitudinal forks at about one-fourth of its length ............ Letra, Mg., p. 96. The 4th longitudinal forks at nearly half its lenpthiewipee - «oe rs ee ACRODICRANIA, Skuse, 8. The 5th vein forks before or under [p. 92. the,fork of the Ath aeimiyy «is. 71,5151 9. The 5th vein forks beyond the fork of [p. 110. (Ne): 10 | ORE Menino SA08, Sroka hich eae PuHRoONIA, Winn. (pt.), 10. iI. 14. 15. 16. LG 18. MYCETOPHILIN &, . The 4th vein forks (after quitting the anterior cross-vein) at not before one- fourbnvor ate length Fj. oe eee 55 6 The 4th vein forks almost immediately after quitting cross-vein............ Petiole of 4th vein equal in length to PM GyOEHME DOS. SET Le yi Onin wie aie wis Petiole of 4th vein one-fourth the length Gf thetbranches)).1.. ..cesenede cance The 3rd vein begins at or before middle of Ist longitudinal vein ............ The 3rd vein begins near tip of ist Honentuminal iss. was dale ages s . Costal vein ending beyond tip of 3rd longitudinal (if but slightly, then auxiliary vein long, and ending in Ist Moripidcimal) ya safe 6 ans % isla se lsne Costal vein not extending beyond tip of 38rd longitudinal vein..........-. . Lateral ocelli not adjacent to eye HAVEN EATS) ss tens, Seb ces: oe epee ey agernr Me Lateral ocelli contiguous or sub-con- tiguous to eye margins .........-.- Costal vein extending but little beyond tip of 3rd longitudinal vein; 6th vein pL OT GS cach uit Sangeet ay Ah syeuksayet= aaniel oa Costal vein extending some little distance beyond tip of 3rd longitudinal vein ; 6th vein nearly reaching fork of HUREVCMIM AM chctas se se yee c 5s Three distinct ocelli, the lateral ones widely removed from eye margins ; base of 3rd longitudinal vein beyond middle of wing; anterior branch of 4th longitudinal vein detached at base Lateral ocelli nearly or quite contiguous fo Gly G AMAT OU Seif t,t tohe kia iefa etal ona Setee of hind tibiz slender, little, if any, longer than the diameter of the tibie . Sete of hind tibize distinctly stouter, at least twice as long as diameter of AUS Pa TANS wiletd cid Schavd celeb greta sare The 5th longitudinal vein forks before TOC ORARBE VOM? «a 02. .lsie isis nee « The 5th longitudinal vein forks beyond TEE OL PUNO ENTE sp cde 2 Boe avalshs «mn « « The 6th vein very stout, ending usually a little beyond the fork of the 5th vein ; 5th vein forking very narrowly at base, the lower branch beyond the middle, suddenly diverging downwards; the fork before the proximal end of anterior CLOSS-VElN os ie sagen urd Gichat «ye» « The 6th vein slender and inconspicuous. 81 10. Devoprsis, Skuse (pt.), (p- 118. ANOMALOMYIA, Hutton, [p. 90. 1k. PALMOANACLINIA, Meun., [p. 85. GREENOMYIA, gen. nov., [p. 87. 13. 15. MaAcrosBracuivs, Dzied., . 108. 14. Lp Purontra, Winn. (pt.), [p. 110. MacroBRacuivs, Dzied. [(pt.), p. 108. CLASTOBASIS, Skuse, p. 94. 16. 20. Ruymosta, Winn., p, 102. Atxopra, Winn., p. 107, * Except in some species of Rhymosia, G 82 MYCBLOPHILIDE . 19, The 4th longitudinal vein forks beyond end of basal cell; the costa extends very little beyond tip of 3rd vein ; ocelli three, the middle one very small. PHronta, Winn., (pt.), The 4th longitudinal vein forks [p. 110 before end of basal cell; the middle ocellus present or absent,........... Exercuia, Winn., p. 112. 20. Auxiliary vein ends in 1st longitudinal ; the branches of the 5th vein diverging. DE .opsts, Skuse, (pt.), wl Auxiliary vein ends free; the branches [p of the 5th vein parallel along their apical third or half, or only very [p. 115. slightly convergent or divergent ..... Mycrropniua, Mg., The fact that several genera fall into two or more parts each of this table proves that a satisfactory classification is still a desideratum. My own special study of the family is too limited to Oriental, and a certain number of European, species to permit me to suggest any wide departure from the classification of Johannsen, who appears to be the latest authority on the group. Distinctions like those employed at points 8, 12, 16, and 17 may perhaps be improved upon when a further knowledge of the world’s species is attained, no classification being satisfactory that is founded on the species of one zoological region only. For this reason the order in which the genera are described herein (which is intended to show their affinities as nearly as possible) varies from that in which they appear in this table. The absence of the posterior cross- vein, in conjunction with the unforked 3rd vein, will easily distinguish members of this subfamily. Genus GNORISTE, Wy. (PI. I, fig. 15.) Gnoriste, Meigen, Syst. Besch. i, p. 245 (1818). GxnoryPe, G. apicalis, Mg., the original species. Head small, rounded, almost hemispherical, placed low upon the thorax ; proboscis prolonged, beak-like ; eyes elongated, somewhat bulging, slightly emarginate at the base of the antenne ; ocelli three, placed in a flattened triangle upon the broad front, the middle one smaller. Palpi situated near the tip of the proboscis, four-jointed, the 1st joint very small, the 2nd largest, the 3rd and 4th oval. Antenne 16-jointed, arcuate, projecting forward, the joints of the scapus bare, the flagellar joints compressed, cylindrical, pubescent. Zhoraw ovate, highly arched; scutellum small, semicircular in outline: metanotum steep, somewhat arched. Abdomen long and slender, compressed, 7-jointed, in the male with an almost clavate extremity and small forceps. Legs \ong and slender, all tibiz with lateral sete, and with spurs. Wings large, oval, microscopically setulose. Costa produced beyond tip of 3rd longitudinal vein but not quite reaching wing- tip ; subcostal cross-vein present, before the origin of the 3rd vein. Auxiliary vein ends near middle of wing; 1st longitudinal a little GNORISTE. 83 curved, ending a little beyond it, the 3rd vein originating near middle of wing at an angle, thence gently bisinuate, the anterior cross-vein placed at the angle. The 4th longitudinal forks just beyond the anterior cross-vein, the 5th at about the same distance ; 6th vein strong but incomplete. Range. Europe, Greenland, North America, Chili, Himalayas. Life-history unknown. Easily recognised, being the only Oriental genus with a produced proboscis. The two Indian species may be separated thus :— Thorax yellowish, with three dark stripes ; proboscis as long as height of head, not ROMDALG MIP treme hued sac = eerie brevirostris, sp. n., p. 83. Thorax shining black on dorsum ; proboscis one-and-a-half times height of head, the long broad labella giving it a spatulate SP POATANES 22). ciaeibia Geo a stemytae acne haars spathulata, sp. n., p. 84. 38. Gnoriste brevirostris, sp. nov. (Pl. III, fig. 7.) ¢. Head: vertex, frons and face blackish ; three ocelli, yellow, distinct, in centre of frons, the middle one lower and smaller. Proboscis about as long as the height of the head, broadly conical ; dark brown, nearly black, with a little pale, very short pubes- cence ; labella distinct, brown ; palpi pale yellow, long. Antennal scape bright yellow, first two or three flagellar joints yellow, the remainder black, with whitish pubescence. Thorax yellowish, with three broad shining black stripes, the median one reaching the anterior margin, the outer ones a little shorter; all three united behind on the posterior margin. Scutellum blackish. Sides of thorax yellowish, pleure and metanotum dark brown. Stiff yellow hairs towards the margins of the thoracic dorsum, and a row of yery small stiff hairs on the median stripe; in addition there are irregular, short hairs scattered over the whole of the dorsum. Abdomen black, with pale pubescence, posterior margin of segments with a dull dirty yellow band; belly similar; genitalia consisting of several comparatively small pale yellow appendages enclosed in an outer blackish cup-shaped cavity. Legs pale yellowish, trochanters and tarsi blackish. Wengs pale: grey ; venation normal; most of the longitudinal veins extremely narrowly suffused with brown. Halteres yellowish. Length 5 millim. Described from a single male from Mundali, Jaunsa Division, Dehra Dun District, 9000 ft., 12.v.10(C. W. Beebe). Type in the Indian Museum. Owing to the drying of the wings the subcostal cross-vein is barely visible, but it is present between the auxiliary vein and the 1st longitudinal, about half-way between the humeral cross-vein and the origin of the 3rd longitudinal. a2 84 MYCETOPHILID&. 39. Gnoriste spathulata, sp. nov. (Pl. III, fig. 8.) 6. Head: vertex and frons black, a little shining, with a few stiff hairs. The ocelli very distinct, reddish brown, the outer ones large, the middle one only a little smaller and barely lower on the frons. Proboscis one-and-a-half times the height of the head, brownish yellow, with long broad labella, giving a broad spatulate appearance to the tip of the proboscis. Palpi pale yellow, long. Antennal scape and first two or three flagellar joints yellow, the remainder light brown, with rather thick whitish pubescence. Thorax : dorsum shining black, prothorax yellowish ; pleure dark brownish black. Scutellum black, a little pale on underside ; meta- notum dark blackish brown. Abdomen black, the first two segments with a brownish tinge, a few pale hairs; belly similar. The geni- talia (not easily seen) appear to consist of a dark rather pointed pair of claspers bearing an elongate yellow finger-like appendage near the tip, and a peculiar large leaf-shaped whitish scale; there is also a comparatively small ventral V-shaped blackish plate. Legs rather bright yellow, base of the femora a little brownish, tarsi darker. (Fore legs missing, except coxe.) Wangs grey, the apical third and front border a little darker. Venation normal. Halteres deep yellow, rather large. Length 4 millim. Described from a single male from Darjiling, taken by myself, 29. v. 10. Type in the Indian Museum. Owing to the drying of the wings the subcostal vein is not apparent, and [ am under the impression that in this species it may be absent. Genus LEPTOMORPHUS, Curt. (PI. II, fig. 1.) Leptomorphus, Curtis, Brit. Entom, p. 365 (1831). Grnotyee, L. walkeri, Curt.; by original designation. Head small, round, much narrower than the thorax, nearly hemispherical, slightly flattened, placed low upon the thorax ; proboscis somewhat projecting ; eyes oval, emarginate at the base of the antenne; ocelli three in number, placed in a flattened triangle on the front, the middle one smaller than the laterals. Palpi cylindrical, incurved, four-jointed, the 1st joint very small, the 3rd nearly twice as long as the 2nd, the 4th somewhat longer than the 3rd. Antennz long, filiform, projecting forward, 16-jointed ; the basal joints differentiated, the 2nd small, with setee at the tip; the flagellar joints cylindrical, somewhat com- pressed, pubescent. Thoraw short, oval, highly arched ; mesonotum with sete only at the sides; metanotum high, strongly arched. Abdomen very long, slender, nearly linear, compressed, seven- jointed, with short terminal joint ; the male with moderate forceps. Legs long, slender, the tibia with long spurs and very minute LEPTOMORPHUS.— PAL-EOANACLINIA. 85 lateral sete; fore metatarsi longer than the tibia. Wings elongate oval, shorter than the abdomen, setulose. Costa ends just beyond tip of 3rd vein. Subcostal cross-vein present, placed near tip of auxiliary vein which latter ends before or after the middle of the wing; Ist longitudinal nearly straight, long; 3rd begins at or before middle of wing at an acute or a right angle, straight nearly to the wing-tip; the anterior cross-vein at the deflection. The 4th and 5th veins widely forked, the latter much before the former; the 6th and 7th veins incomplete and short. Range. Europe, Assam; of the only two previously known species, one is European, the other is from an unknown locality. Life-history unknown. “This genus resembles Boletina most closely, but differs in having longer legs, the fore metatarsi being longer than the corresponding tibiee, and in a relatively longer petiole of the media,* the petiole being about half as long as the anterior branch. There are several undescribed North American species of Boletina which closely approach Leptomorphus.” (Johannsen. ) 40. Leptomorphus ornatus, sp. nov. 2. Head wholly bright chrome-yellow ; antenne (tips broken off) slightly brownish on upper half. Ocellar triangle black. Thoraw: dorsum shining indigo-black. Shoulders, scutellum and sides (except pleure, which are shining black), bright yellow. Metanotum brown, lighter at the sides. Abdomen rich brown, shortly pubescent ; 1st and 2nd segments all brown, 3rd, 4th and 5th with a broad basal yellow band, 6th all brown, 7th brown with a narrow vellow tip. Genitalia very small, yellow. Legs pale yellow, tarsi brownish; hind femora very slightly brown at base above, and at tips. Wings pale grey, with microscopic hairs; apical part brownish, the colour stretching across the wing from just before the tip of the 1st longitudinal vein te the hind margin, cutting the middle of the branches of the 4th vein. Upper branch of 5th vein wavy. Halteres yellow, clubs black. Length 7 millim. Described from a single female in the Indian Museum from Sylhet, 3.11.05 (Hall). A very distinct and handsome species, having generic characters agreeing exactly with those of Leptomorphus ; the fore metatarsus is about one and a half times as long as the fore tibia. Genus PALHOANACLINIA, Meun. (PI. II, fig. 7.) Paleoanaclinia, Meunier, Monog. Mycetoph. p. 148 (1904); Johannsen, Gen. Ins., Fase. 93, p. 85 (1909). Gernorypn, P. distincta, Meun.; by original designation. Head small, rounded, flattened in front, placed low upon the * The “ media” is the 4th longitudinal vein. 86 MYCEVOPHILID 2. thorax ; eyes oval, emarginate at base of antenne; ocelli three, arranged as a flattened triangle, the middle one small. Palpi 4-jointed, incurved; Ist joint small, the last one the longest. Antenne projecting forward, longer than head and thorax taken together, those of the male the longer; 16-jointed, scapal joints cupuliform, the flagellar joints cylindrical, rather compressed, pubescent or nearly bare. Thoraa short, oval, highly arched, meta- notum high, somewhat arched, scutellumsmall. Abdomen of seven segments, long and slender, cylindrical, that of the male with a short forceps; in the female with very short ovipositor, at tips of which are two small lamelle. Legs long and slender, femora slender, slightly compressed, tibise with spurs and weak lateral sete, fore metatarsus shorter than corresponding tibia. Wings elongate oval, base somewhat rounded, as long as or rather longer than the abdomen, microscopically setulose. Costa extending beyond tip of 3rd vein ; auxiliary vein of moderate length, ending before middle of wing ; 1st longitudinal ending at about two-thirds of the wing, straight. The 3rd vein beginning at about the middle of the wing at a right angle, thence nearly straight, its basal portion appearing almost like a cross-vein. Anterior cross-vein moderately long, distinctly oblique, 4th longitudinal forked before half its length, the branches diverging towards their tips, 5th longitudinal similarly forked, the fork occurring just below the anterior cross-vein ; 6th vein short, incomplete, 7th longer and more distinct. Range. Europe and North America (recent) and in Baltic amber. Only three living species are known, occurring in Austria, Finland and Alaska; there are three fossil ones. Life-history unknown. 41. Paleoanaclinia flavohirta, sp. nov. 3. Head wholly black, except extreme tip of 2nd scapal joint of antenne which is narrowly yellow, and the flagellum which is dark brown, with short, pale pubescence. A few yellow hairs behind head. WYhoraa: dorsum black, shoulders and lateral margins as far as wings, and the pleure, with grey dusting. Three dorso- central rows of yellow hairs, and a number of strong bristles, apparently irregularly placed, along the lateral and posterior margins. Scutellum and metanotum black, former with yellow hairs on hind margin. Abdomen shining black, with pale hairs, of only six distinct segments; lst segment a little compressed, remainder somewhat broad. Legs pale yellowish, tibize darker towards tips, posterior coxe and all tarsi black. Wings pale brownish ; halteres yellow. Length 33 millim. Described from a single specimen in the Indian Museum, from Darjiling, 11. viii. 09 (Dr. Jenkins). I place this species in Palwoanaclinia which is said to possess seven abdominal segments, but the present specimen has certainly only six. GREENOMYIA. 87 Genus GREENOMYIA, gen. nov. GuEnoryPn, G. nigricova, sp. nov. Near Palwoanaclinia, Meunier. Wings: auxiliary vein half as long as 1st longitudinal, faint but distinet; subeostal cross-vein absent; 3rd longitudinal emerging from Ist near its tip, comparatively short, reaching margin of wing some distance before tip; costa not produced beyond tip of 3rd; cross-vein more oblique than in Paleoanaclinia. Petiole of 4th vein rather more than one-fourth the length of the (parallel) branches, the upper one of which ends at extreme wing- tip; 5th vein forks immediately under tip of subcostal, distinctly before fork of 4th, its branches parallel. Anal vein (6th) strong, straight, parallel to petiole of 5th, and ending just beyond fork ot latter, 7th absent. Ocelli three, in a straight row in centre of frons, no ocellar protuberance. Abdomen 6-segmented(¢). Legs moderately stout ; tibia spurred, posterior pairs with three rows of sete. The 2 is unknown. It is with much pleasure that I name this genus after Mr. E. E. Green, of Ceylon, who has done such a great amount of work for Oriental entomology, and to whom I am personally indebted for a large number of Diptera from Ceylon. 42, Greenomyia nigricoxa, ap. nov. (Pl. I, fig. 8; Pl. III, fig. 9.) 3. Head quite black, except a little grey reflection on face ; the yellow palpi and flagellum with a dark brown tinge. Thorac shining black, with a little greyish reflection here and there laterally, and behind the shoulders. Irregular black bristles over dorsum, stronger ones towards sides; two dorso-central ones on posterior margin. Scutellum narrow, black, with four stiff bristles on the hind margin ; metapleure greyish, viewed from behind. Abdomen of six segments only, the 1st much broader; moderately shining black, cylindrical, rather robust, posterior margins of basal segments narrowly brown, bind margin of last segment emargi- nateabove. Genitalia broad, black, semicircular; a pair of flattened black claspers, having the first joint bread, the second not obvious but presumably present, small, ending in two distinct thick short black tooth-like spines and two strong long slender spines on the inner side. Legs: fore coxe and all the femora yellowish ; posterior cox black ; tibiz brownish yellow ; tarsi black. Wengs very pale grey, nearly clear; a light brownish suffusion at tip extending inwards as far as the middle of the branches of the 4th longitudinal vein. Halteres yellow. Length 23 millim. Described from a single male in the Indian Museum from Phagu, 8700 ft., Simla district, 3. v.07 (Annandale). 88 MYCETOPHILID 2. Genus ALLACTONEURA, Mei).* Allactoneura, de Meijere, Tijd. Ent. 1, p. 201 (1907). GeEnoryPE, A. cincta, Meij., the original species. Head in profile oval, frons arched, with depressed line in middle. Two distinct ocelli, remote from eye margins, and an indistinct middle ocellus. Eyes broadly oval, face but slightly arched. Antennz 16-jointed, as long as head and thorax together, flagellar joints cylindrical, longer than broad, closely sessile. Thorax not deep, with sete posteriorly, elsewhere with scales and with appressed pile, as has also the abdomen; scutellum with two long sete at the apex. Abdomen somewhat depressed, slender, in both sexes seven-segmented, in the male with a forceps hidden under the 7th segment; in the female the 7th segment and the lamelle are very small. Legs: coxe long and robust: all tibia with several ranges of sete; spurs strong; tarsal joints, particularly the metatarsi, with numerous setule. Wings narrow, without anal angle. Costal vein ends just before tip of wing ; subcostal cross- vein present, some distance before tip of auxiliary vein, the latter ending at one-third of the wing. he 1st longitudinal vein nearly straight, the 3rd begins near the subcostal cross-vein at a very acute angle, nearly longitudinal, the basal portion in a straight line with the rest of the vein. Anterior cross-vein placed transversely, that is to say, upright, near middle of wing, a little before the fork of the 4th longitudinal vein. Marginal (presumably) cross-vein present, joining the Ist and 3rd longi- tudinals, placed nearly opposite the fork of the 4th vein.t The 5th vein forks at extreme base of wing, the branches detached ; the 6th and 7th veins are absent, but a fold in the wing behind the 5th vein (generally very distinct) appears, unless very closely examined, like a 6th vein. ‘ Range. A. cincta, the only known species, was recorded originally from Java, but it seems widely distributed in the East. Life-history unknown. 43, Allactoneura cincta, Meij. (Pl. I, fig. 17.) Allactoneura cincta, de Meijere, Tijd. Ent. 1, p. 202, pl. v, figs. 2, 3. 3d 2. Head: vertex black, frons blackish, remainder of head reddish yellow or dirty brownish with blackish hairs; palpi the same: antennal scape and about the basal third of the flagellum, * The description of the veins in Ad/actoneura is by the present writer, the other characters being taken from de Meijere. t It is curious that de Meijere dues not mention the very distinct (although yellow, in contradistinction to the dark brown anterior veins) cress-vein between the lst and 3rd longitudinal veins, placed nearly opposite the fork of the 4th vein. Over a score of specimens have been examined by me and itis distinctly obvious in all, if looked for; also in an example identified by de Meijere himself. It will presumably be the marginal cross-vein, but is not always easily seen, from a prevailing tendency in this species for the wing to curl up. ALLACTONEURA.—ODON'TOPODA. 89 more or less yellowish, rest of flagellum black, antenne as long as the head and thorax together. Thorax blackish, with very minute black sete, that in certain lights appear as a dull silvery sheen, lateral bristly hair stronger. Sides of thorax, scutellum and metanotum black, seutellum with two long apical curved bristles that eross one another. Abdomen black, with a narrow basal whitish band on the segments, very variable in its nature and sometimes practically absent. Genitalia of male prominent below the last segment of the abdomen, with two nearly straight claspers, which have black hairs on the underside and on the innerside are provided with hook-shaped tips; of female very small, yellowish. Legs pale whitish yellow; coxe very large, alittle black at base and tip; femora with the fore pair only a little black at tip, middle pair broadly black-tipped and hind pair wholly black or nearly so ; tibize and tarsi blackish, the latter the darker, tibial spurs yellowish, innerside of fore tibie pale yellowish; the tibie of three very unequal lengths: the fore pair quite short, the middle pair distinctly longer but relatively short, the hind pair of normal size compared with other genera in this family. Wangs pale grey, broadly blackish at tip, the colour covering about the apical third, the depth of shade and the extent varying. Venation in accordance with the generic description. Length 5 millim. Described (the female only) from several of that sex in the Indian Museum from Sylhet, 1.1.5 (Zt.-Col. Hall); Thamaspur, Nepal, 18-20.i1.08; Peradeniya, Ceylon, 10-30. vi.10 and 15. vii. 10 (both Gravely); Semarang, Java (named by de Meijere), %i. and iii. 06 (Jacobson). In my collection from Peradeniya, Ceylon, ix. and xii. 09 (Green). The description, so far as it applies to the male only, is in- corporated from Dr. de Meijere’s description as I have not seen a male myself. The author of the species says the sexes are alike, except that in the female the last abdominal segment is shorter than the preceding and is dark brown. He also observes that this species must be akin to Mycetophila obscurata, Walk., described from Salawatti. The black body, yellowish white, black-tipped coxee and anterior femora, and wholly black hind femora, reddish face and base of antenne, and smoky tips to the wings, make the species a conspicuous one. The wings show a great tendency to fold up in all the specimens I have seen. Genus ODONTOPODA, Ald. (Pl. I, fig. 16.) Odontopoda, Aldrich, Rep. Geol. Indiana, xxi, p. 187 (1898). Proanaclinia, Meunier, Monog. Mycetoph. p. 145 (1904). GunoryPe, O. sayi, Aldr. Head: ocelli three, all large, placed nearly in a straight line ; antenne 16-jointed, the two basal joints differentiated, those of the flagellum cylindrical, the 1st flagellar joint the longest. Palpi 90 MYCETOPHILID A. four-jointed, Ist joint short, 2nd a little longer, 3rd longer than the two preceding, 4th a trifle shorter ; coxe elongated. Abdomen of the male long, slender, clavate, composed of seven distinct segments besides the hypopygium. Wings elongate oval. Costal vein ending at tip of 3rd vein; auxiliary vein long, ending near middle of wing; Ist longitudinal practically straight, long; 3rd longitudinal beginning before middle of wing in a bold curve, considerably bisinuate afterwards, anterior cross-vein situated near its base. The 4th longitudinal forked before its middle, anterior branch indistinct at base; 5th vein widely forked below or just beyond anterior cross-vein ; 6th vein incomplete. Range. United States (Indiana) and Sikkim; also in Baltic amber. The above (except the wings) is trom Johannsen (Gen. Ins.), and I assume it to be a copy of Aldrich’s original description, which is not accessible to me. Johannsen thinks the genus may possibly be synonymous with Newratchia. 44. Odontopoda indica, sp. nov. 3d. Head: vertex blackish, face brown, underside of head and the palpi yellow ; antennal scape and base of Ist joint of flagellum yellow, rest of flagellum brown. Thoraw yellowish brown, with short yellow hairs and stiffer bristly hairs around the margins ; pleure with a slight violet tinge. (Scutellum and metanotum damaged.) Abdomen blackish, of seven elongated, subcylindrical segments with yellowish grey pubescence. Genitalia very large, bulbous, blackish brown, hairy and bristly, with a ventral plate. Legs yellowish; tarsi barely darker. Wings pale greyish, highly iridescent, base of upper branch of 4th longitudinal vein indis- tinct ; halteres yellow. Length 34 millim. Described from a single male in the Indian Museum taken by me at Darjiling, 6000 ft., 1.x. 08. The middle ocellus is not visible, owing to a slight crushing ot the top of the head; it may or may not be present. Otherwise, except the slight damage to the scutellum and meianotum caused by the pin, the specimen is perfect. ~ Only three species are known—two fossil ones from Baltic amber, and the third from Indiana, U.S.A. ; it is therefore interesting to find the genus in the Himalayas. Genus ANOMALOMYIA, Hutton. (PI. II, fig. 6.) Anomalomyia, Hutton, Index Fauna Noy. Zeal. p. 134 (1904). Anomala, Marshall (nec Stephens), Traus. New Zeal. Instit. xxviii, p. 293 (1896). Gunoryer, Mycetophila guttata, Hutton. Head moderate, nearly round, but slightly prolonged posteriorly, situated rather deep in the thorax. Eyes ovate, entire; ocelli two or three; if only two are present, one is situated in the margin ANOMALOMYIA. 91 of each of the compound eyes ; if three, the third in the middle of the front. Palpi short, incurved, four-jointed; 1st joint short, moderately robust, 2nd much longer, 3rd and 4th more slender and about equally long. Antenne cylindrical, tapering toward the apex, projecting forward, arcuated, 16-jomted ; 1st joint of scape nearly cylindrical, 2nd cupuliform, both joints setiferous on the sides and on the upper edge ; flagellar joints cylindrical, with a short downy pubescence. TZhoraw highly arched; scutellum semicircular. Abdomen rather flattened, broadest in the middle. Legs vather short ; tibiz spurred and provided with lateral spines, which are short on the anterior tibie, and long ones arranged in three ranges on the intermediate, and two ranges on the posterior tibie. Wings with anal angle and tip rounded, the costal vein ending a little before the tip. Auxiliary vein rather long, reaching nearly to the middle of the wing; Ist longitudinal curved gently upwards, ending a little beyond middle of wing; 3rd begins at a right angle (like a cross-vein) from near the tip of the 1st: it is therefore short, and after the bend runs straight to the wing- border. Anterior cross-vein very oblique, rather long, in a line with the major portion of the 3rd vein; 4th longitudinal torked widely near border of wing ; 5th forked widely at half its length ; 6th short, indistinct. Range. New Zealand (two species) and Eastern Himalayas. Life-history unknown. 45. Anomalomyia indica, sp. nov. ¢. Head black above; ocelli placed towards centre of frons, middle one smaller and lower. Head below antenne yellow. Antennal scape and base of Ist joint of flagellum yellow ; rest of flagellum blackish brown, with pale pubescence. Vhorax: dorsum brownish yellow ; two median narrow black stripes from anterior to posterior margins, a shorter wider one on each side on the hinder two-thirds of the distance. Surface with small bristles of different lengths, more or Jess in longitudinal rows ; lateral margins with larger different-sized ones irregularly placed, but there are four or five strong spiny bristles in a row below the shoulders, a row of three in front of the base of the wing, several supra-alar ones, two streng ones at each posterior corner, and two dorso-central large ones between these pairs. Scutellum yellow, with four large curved bristles. Abdomen black, 6-segmented, with sparse short pubes- cence, moderately broad. Genitalia small, dark brown, pubescent, apparently consisting of a pair of short thick claspers (the second joint of which is not visible) and a small dorsal plate. The genitalia are mainly concealed, but there is a conspicuous, almost erect. bright yellow, narrow, ventral plate, above which can be seen the palp-like tips of a pair of organs. Legs: coxe yellowish ; femora black, except apical half of fore pair, and tip of hind pair yellowish ; fore tibiz yellowish, posterior tibiz brown, tibial spurs strong, yellowish white; tarsi dark brown. Wings pale yellow, 92 MYCBLTOPHILID-E. veins dark brown, distinct, anal vein not apparent; a brown suffusion at tip of wing, Just beyond the forking of the 4th vein. Halteres pale yellow. Length 3 millim. Described from a single male in the Indian Museum, taken by Mr. Paiva at Darjiling, 7. viii. 09. Genus ACRODICRANIA, Skuse. Acrodicrana, Skuse, Proc. Linn. Soc. N. 8. Wales (2) iii, p. 1194 (1888). GunorypE, A. atricauda, Skuse; by original designation. Head ovate, fore part flattened, situated deep in the thorax ; front broad, the anterior margin produced into a small triangle reaching the basal joints of the antenne ; eyes oval; ocelli three, of unequal size, arranged ina line on the front. Palpi prominent, incurved, four-jointed; 1st and 2nd joints robust, short, the 2nd about twice the length of the 1st; 3rd joint much more slender and a little longer than the 2nd; 4th joimt very slender, not the length of the 2nd and 8rd taken together. Antenne cylindrical, projecting forwards, arcuated, about as long as or somewhat longer than the thorax, 16-jointed ; 1st scapal joint cyathiform, about twice the length of the 2nd, the latter cupuliform, both with short setaceous hairs at the apex; the 2nd joint generally with only one strong seta; flagellar joints cylindrical, with very short downy pubescence. Thorax ovate, highly arched; scutellum nearly as wide as the thorax, too flattened to be semicircular; metathorax highly arched. Abdomen rather robust; eight segments, the eighth very short and generally hidden by the seventh ; in the male flattened, claviform, with a moderate anal joint and forceps; in the female robust, flattened, terminating in a short ovipositor provided with two small terminal lamelle. Legs strong; femora broadly flattened ; tibia spurred, and having strong lateral spines on the intermediate and hind pairs; fore tibise with a range of minute spines on the outer and inner side, the spines on the latter widely separated and few; intermediate tibize with three ranges on the outer side and one on the inner side; hind pair with two ranges on the outer side. Wings longer than the abdomen, moderately broad, with rounded-oft base ; microscopically pubescent. Ven- ation with rather an abnormal appearance. The auxiliary vein short, ending in the costa at one-third of the wing, with the subcostal cross-vein distinct, near its tip. The 1st longitudinal nearly straight, ending at middle of wing; 3rd vein originating from near tip of Ist vein, at a right angle (like a cross-vein), slightly bisinuate, short. Anterior cross-vein long, oblique, forming with the 3rd vein (after the bend) a bisinuate line. The 4th vein forked widely some distance beyond contact with anterior cross-vein, the 5th widely forked before half its length, the branches a little sinuous, the upper one detached at its base. The ACRODICRANTA, 93 6th vein long, but ending far from border of wing; the 7th very short, indistinct. : Range. The only four known species are from Australia. Froggatt considers the genus a synonym of Leia. The two species referred here with some doubt to this genus are distinguished easily thus :— Thorax unicolorous, unmarked............ Serrugined, sp. 1., p. 93. Thorax with a large oval black spot towards ERen se Or The GOTSUM. 4a. - @ aie see aes, meerti, sp. n., p. 93. 46. (2?) Acrodicrania ferruginea, sp. nov. ? 9. Head orange-yellow. yes ovate. Palpi orange-yellow,. apparently four-jointed; Ist short, 2nd and 3rd long, the former the widest of all, 4th short, but the demarcation of the joints not very obvious. Antenne with the scape and basal half of flagellum reddish orange, apical half of flagellum blackish. Z'horaa orange- yellow, highly arched, microscopically pubescent. Scutellum (damaged by pin) nearly as wide as thorax, short, blackish ; meta- notum blackish. Abdomen black, closely but shortly pubescent ; apparently only 6-segmented, though a seventh may be easily con- cealed below the last one; segments towards the base more or less dark brownish yellow ; belly similarly coloured. Legs orange- yellow, a little tinged with brown. Femora blackish towards tips ; middle and hind tibi# with two rows of short sete, which are longest on the latter. (Fore tibiz missing.) Posterior tibiee with long pale yellow spurs, tarsi a little darker. “ings pale yellowish- grey. Venation mainly as in Johannsen’s figure (Gen. Insect., Fasc. 98, pl. 5, fig. 14), but the base of the 4th vein and the anterior eross-vein, with the 3rd vein, are all of them more in a straight line; whilst the petiole of the 2nd posterior cell is not a strong vein as shown in the author’s figure, but is as weak as the branches forming the fork. Length 3 millim. Described from a single specimen (which appears to be a female, although no genital organs are visible) taken in the Khasi Hills, Assam, 1000-8000 ft., x. 06. Type in the Pusa Collection. This species is referred doubtfully to Acrodicrania, as some dis- erepancies are noticeable. The head is not sunk in the thorax ; the abdomen has six, at most seven segments, not eight, as in Skuse’s description. 47. Acrodicrania incerta, sp. nov. 2. Head pale yellow, with pale yellow pubescence; vertex a little darker. Proboscis obtusely conical, pale yellow ; palpi pale yellow. Antennal scape pale yellow; 1st joint moderately long, ‘94 MYCETOPHILIDA#. a little broader at the tip, with a circlet of bristles ; 2nd joint cup-shaped, with a row of bristly hairs near the tip. The first few joints of the flagellum yellowish, gradually darkening to black (at about the 5th joint), the remainder wholly black, the whole flagellum with whitish pubescence. Thorax shining light brownish- yellow ; towards each side a very large elongate oval shining black spot, occupying about two-thirds the length of the dorsum, sepa- rated by a moderately broad space. The whole dorsum with rather long stiff yellow hairs. Scutellum blackish, broadly yellow along the whole base, posterior margin with four very long yellow bristles. Metanotum and pleure blackish. Sides of thorax yellowish. Abdomen: the 1st segment pale yellow, the remainder blackish, with pale pubescence on dorsum and longer yellow hairs along the sides. Belly black, with yellow hairs, yellowish at base. Of the genitalia two rather large blackish lamelle are visible, with stiff bristly hairs at their tips. Legs wholly pale yellow, except the tarsi which are a little darker, and there is a trace of blackish colour about the trochanters. Wings pale yellowish grey, a little more yellowish on the basal anterior part. Veins brownish yellow, venation normal.* Halteres missing. Length 23 millim. Described from a single female taken by Dr. Annandale at Kurseong, 20. vi. 10. Type in the Indian Museum. The yellow thorax and large black side-spots make this species appear very like Leta arcwata, Brun., but the absence of the con- spicuous arcuate blackish stripe on the wings at once distinguishes it. Genus CLASTOBASIS, Skuse. (PI. II, fig. 5.) Clastobasis, Skuse, Proc. Linn. Soc. N. 8. Wales, (2) v, p. 617 (1890). GrnorypE, C. tryonit, Skuse; by original designation. Head roundish, flattened in the fore part, situated deep in the thorax; front broad, the anterior border produced triangularly, the point between the joints of the scapus; vertex high; eyes oval; ocelli large, the middle one smaller, situated almost in line with, but somewhat behind the other two. Palpi prominent, four- jointed ; 1st joint small, 2nd tolerably long and robust; 3rd a little longer than the second, more slender ; 4th very long and slender, about equal in length to the 2nd and 3rd combined. Antenne slender, porrected, arcuated, 16-jointed ; Ist joint of the scapus obconical, longer than the second, the 2nd cupuliform, both setiferous at the apex; flagellar joints cylindrical, progres- sively diminishing in thickness, with minute downy pubescence. * The venation agrees with the figure of the wing given by Johannsen (Gen. Insect., Fasc. 93, pl. 5, fig. 14). CLASTOBASIS. 95 Thorav ovate, highly arched, hairy; lateral border setiferous ; scutellum lunate, setiferous; metanotum large, acclivous.