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SOUTH-AFRICAN BUTTERFLIES: wa MONOGRAPH OF THE EXTRA-TROPICAL SPECIES. BY ROLAND TRIMEN, F.R.S., F.LS., F.ZS., F. Env. 8., & CURATOR OF THE SOUTH-AFRICAN MUSEUM, CAPE TOWN ASSISTED BY JAMES HENRY BOWKER, F.ZS., F.R.G.S. COLONEL (RETIRED) IN THE CAPE SERVICE LATE COMMANDANT OF FRONTIER ARMED AND MOUNTED POLICE GOVERNOR’S AGENT IN BASUTOLAND, AND CHIEF COMMISSIONER AT THE DIAMOND FIELDS OF GRIQUAL G On ne ee t Se a Ue ey ee een BALLANTYNE, HANSON AND CO. EDINBURGH AND LONDON Oe ere PREFACE. ————— THE book entitled “ Rhopalocera Africe Australis; a Cata- logue of South-African Butterflies,’ which I published in 1862-66, has for long been out of print as well as out of date. Incomplete as it necessarily was, I am glad to know that it has proved very serviceable, especially in South Africa ; and this has encouraged me to prepare the present work on the same subject, embodying as far as I am able the results of the wider know- ledge gained during the twenty-one years which have passed since the old book made its appearance. As the new work is much more than a second edition of the former one, I have given it a different title, concisely descriptive of its character and scope. Unable to finish the work as soon as I had anticipated, I think it well to publish the completed portion without more delay. The two parts now together issued contain the Fami- lies Nymphalide, Erycinda, and Lycende, comprising 238 species,—a little over three-fifths of the whole number known. The concluding part, dealing with the Families Papilionide and Hesperide, will describe about 142 species, bringing the total of known South-African forms up to about 380,—a strik- ing increase over the record in 1866, when (after removing the erroneous admissions from the list) only 197 natives of South Africa were registered. Keeping in view the requirements of students and collectors in the Cape Colony, Natal, and elsewhere in South Africa, who are for the most part debarred from opportunities of consulting vi PREFACE. properly classified collections or accepted works of reference, | have prefixed an Introduction, which comprises a brief notice of the structure of insects generally, and a fuller account of the Order Lepidoptera. After the technical diagnosis of the Sub- Order Rhopalocera, which follows, I give at some length a series of general observations on butterflies, under the heads of ; 1. Dis- tinctive Characters of Rhopalocera ; 2. Classification ; 3. Geogra- phical Distribution ; 4. Differences Presented by the Sexes; 5. Haunts and Habits; 6. Protective Resemblances and Mimicry ; and 7. South-African Butterflies. In Plate A., exhibiting the neuration of the wings and some other structural features of chief value in classification, I have selected for illustration a common and characteristic species of each Family and Sub- Family inhabiting South Africa, and in the explanation accom- panying the plate I have entered into full details. In the generalities just referred to, as well as in the subse- quent ones following the diagnosis of the various Families, Sub-Families, and Genera, care has been taken not to confine them to South-African, or even to Ethiopian forms, but to include, wherever serviceable, reference to allied groups or species in other parts of the world. In dealing with the species, the progress of observation has made it practicable to give, either from my own or (more frequently) others’ notes, many more interesting details of the larvee, pupze, and habits generally than were contained in my former work. In revising the synonymy, I have endea- voured (following the example long ago set by the illustrious Darwin) to weed it of ‘“‘references to works in which there is not any original matter, or in which the plates are not of a ”* and in all cases where the authority high order of excellence ; was accessible to me, I have personally verified every reference given either to a description or to a figure. In instances where this has not been practicable, inverted commas denote that the 1 Monogr. on the Sub-Class Cirripedia, i. p. x. (1851). PREFACE. Vii quotation is not my own. Special care has been taken to ascertain and state systematically the recorded geographical range of every species, and the known localities have accord- ingly been arranged uniformly throughout in the following order, viz. :— I. Sourn AFRICA. A. Great Namaqualand. B. Cape Colony («. Western Districts, ). Eastern Districts, c. Griqualand West, d. Basutoland). Orange Free State. . Kaffraria Proper.! Natal (a. Coast Districts, b. Upper Districts), Zululand. . Swaziland. . Delagoa Bay. Inhambane. . Transvaal. HARP ee eo . Bechuanaland. M. Kalahari. II. Orger AFRICAN REGIONS. A. South Tropical (a. Western Coast, aa. Islands, a1. Western Interior). B. North Tropical (subdivided as in South Tropical). C. Extra-Tropical North Africa. III. Europe. IV. Asta, V. AUSTRALIA. VI. AMERICA. In this arrangement South Africa is, of course, treated more in detail than other regions, and in the map issued with this work the several territories south of the Tropic are denoted by red letters corresponding to those above given. As regards the 1 When this arrangement was planned, Kaffraria Proper or Independent Kaffirland occupied all the territory between the Cape Colony and Natal, or, in other words, between the Kei and Umzimkulu. Politically the whole of this territory, except the central coast tract of Pondoland and the small north-east tract named ‘‘ Alfred”? annexed to Natal, now forms part of the Cape Colony. The several subdivisions of the territory are named Tembuland Proper, Emigrant Tembuland, Fingoland, Gcalekaland, and Griqualand East. Vili PREFACE. list of recorded localities of each species, it should be noted that (1) when I have personally captured the species, the name of the place is given alone; (2) when I have received specimens of the species and determined them, the name of the collector (in italics and bracketed) immediately follows that of the place ; and (3) when place and collector are quoted from other authors, they are placed between inverted commas, and the name of the author responsible is added. The coloured plates are wholly new, none of the species represented in the former work being re-figured. Plates I. and II. are devoted to larvee and pupz, taken from life by myself in a few instances, but mostly drawn by other observers. Plates III. to IX. depict perfect insects of the Families treated in Parts I. and II. of the work, exhibiting both upper and under surfaces of the wings. Three other plates have been executed in illustration of Part III. While the figures are for the most part those of new or previously unfigured species, a fair pro- portion consists of more accurate representations of butterflies hitherto inadequately depicted, or of which only one sex had been illustrated. They have been chromo-lithographed from nature by Messrs. West, Newman, & Co., of Hatton Garden, London. Although for many years fortunately situated as regards the prosecution of this work by my tenure of the Curatorship of the South-African Museum, I have, on the other hand, had to sustain the serious disadvantage of being tied by official duties to a locality lamentably barren of butterfly life. Cape Town and its neighbourhood is absolutely not more productive of species than Brighton, and, as regards size (with three excep- tions) and abundance of individuals, the butterflies of the South- African metropolis compare very badly with the series yielded by the principal town of Sussex. Beyond a stay for nine months in the Knysna district, and occasional more or less hurried ex- cursions to Namaqualand, Griqualand West, Grahamstown, and PREFACE. ix Natal, my opportunities for personally collecting and observing have only extended to the unproductive Western Districts within 150 miles of Cape Town. This unfavourable limitation of my own field-work has, however, been very largely counterbalanced by the abundant material which has always been placed at my disposal by the activity and liberality of my numerous corre- spondents in different parts of South Africa. At the head of these generous helpers in my work stands my friend Colonei James Henry Bowker, to whose energy and observant powers as a naturalist I owe the greater part of my acquaintance with the rarer Lepidoptera of the country. As long ago as 1866 I had the pleasure of recording how largely he had contributed to my former work; and my indebtedness to his generous aid has, I am happy to say, steadily increased ever since. Colouel Bowker’s début as a votary of entomology took place in Kaffraria twenty-seven years ago, and the great suc- cess which attended his researches in that productive region was only the prelude to his fruitful labours in Basutoland, Griqualand West, Natal, and Zululand. The fine collection of native butterflies in the South-African Museum owes the greater part of its treasures to his exertions,—no less than forty new species, and one most remarkable new genus (Delonewra), in addition to very many rarities, being his own discoveries and donations. ‘The gift of specimens has been immeasurably en- hanced in value by his copious notes on the haunts and habits of the insects, their distribution in South Africa, and their earlier stages. It is in very inadequate but most grateful acknowledgment of his co-operation that I have, with his per- mission, associated his name with my own on the title-page of the work to which he has so extensively and ably contributed. To Mrs. F. W. Barber, the sister of Colonel Bowker, I am also greatly indebted. Long known to European botanists for her attainments and discoveries in regard to the Flora of the x PREFACE. Cape, this lady had a wide acquaintance with South-African Natural History generally, and in 1863 turned her attention specially to the Lepidoptera. With characteristic generosity— knowing that I was engaged in bringing out a book on the subject—Mrs. Barber offered me the fullest aid, and constantly since then have her net, pen, and artistic pencil been actively engaged in furtherance of my work. Of special value have proved her graphic accounts of the habits and stations of the butterflies of the Eastern Districts of the Cape Colony, where she has chiefly resided, and her excellent coloured drawings of larvee and pupee, some of which are reproduced in Plates I. and II. of this volume. My friend’s strong love of nature and keen observant powers are happily shared by her daughter, Mrs. Bailie, and her two sons, Mr. Frederick and Mr. Henry Barber ; and many of the most interesting captures and discoveries recorded by Mrs. Barber are due to their enthusiastic co-opera- tion as collectors and observers. Mr. F. and Mr. H. Barber have also independently rendered me much service by sending down several collections made in the Transvaal and the country northward to the Zambesi. The principal material at my disposal has been as follows in respect of the various South-African territories named; and I must ask the donors who may see these pages to excuse the brevity with which their valued contributions of specimens and notes (and in some cases drawings also) are of necessity here gratefully acknowledged :— GREAT NAMAQUALAND.—A small series from Mr. W. C. Palgrave. CarE Cotony (Western Districts).—Collections from the neighbourhood of Cape Town, besides those made by myself for many years:—Mr. C. A. Fairbridge, Senior Trustee of the South-African Museum; Mr. E. L. Layard, formerly Curator of the Museum; the late Mr. H. W. Oakley, Assistant to the Curator. PREFACE. x From Knysna District, besides my own collection made there in 1858-59: a fine collection formed by Miss Wentworth, now Mrs. J. J. Muskett; and a smaller series from the late Mr. W. H. Newdigate. From Caledon, Swellendam, Montagu, and Robertson : small collections made respectively by the Rev. G. Hettarsch, the late Mr. L. Taats, Dr. D. R. Kannemeyer, and myself. From Carnarvon District: several small separate series from Mr. E. G. Alston. From Namaqualand District, in addition to some species taken by myself in 1873: a very interesting collection made in 1885 by Mr. L. Péringuey, Assistant Curator of the Museum. (Eastern Districts).—From Albany and Bathurst Districts and parts of adjacent Districts, besides Mrs. Barber’s extensive collections and one formed by myself in 1870: various contri- butions by Miss M. L. Bowker, Mr. H. J. Atherstone, Dr. H. Becker, Mr. W. F. Billinghurst, Mr. John L. Fry, and Mr. F. Schiffman. From Port Elizabeth and Uitenhage Districts, besides a small series of my own taking: collections by Colonel J. H. Bowker and Mr. 8. D. Bairstow. From King William’s Town and East London Districts: many specimens and drawings, with excellent notes, from Mr. J. P. Mansel Weale; various living pupe, as well as other specimens, from Miss F. Bowker; numerous examples, with valuable accounts of seasons and haunts, from Mr. W. 8. M. D’Urban ; a small collection made at East London by Mr. P. Borcherds ; and various species from the Venerable Archdeacon Kitton. Colonel Bowker also from time to time forwarded a considerable number of butterflies from these districts. Albert District : a small but most interesting series collected by Dr. D. R. Kannemeyer, illustrated by notes of much value on stations and habits. xii PREFACE. Basutoland.—From this territory the only material received was the collection formed by Colonel Bowker between March 1868 and June 1870; it consisted of sixty-two species. Griqualand West.—Mrs. Barber and Colonel Bowker for- warded considerable series, chiefly from the banks of the Vaal River; smaller sets from time to time contributed by Mr. John B. Currey, Mr. John L. Fry, Mr. H. L. Feltham (with notes of much interest), and the late Mr. 8. Stonestreet. KAFFRARIA Proper.—A very fine and complete collection gathered by Colonel Bowker in the country between the Great Kei and Bashee Rivers during the years 1860-66. Natat.—In addition to my own captures in 1867, very extensive series (with copious notes, larvee, pupee, &c.), secured by Colonel Bowker from 1878 to the present time; many specimens (with excellent drawings of early stages and useful observations and descriptions) from Mr. W. D. Gooch; a few specimens, but many most interesting sketches and descrip- tions of larvee and pups, from Captain H. C. Harford; many admirably preserved examples from the Upper Districts, collected by Mr. J. M. Hutchinson ; a large collection formed at D’Urban by the late Mr. M. J. M‘Ken; several new and rare forms from Mr. W. Morant; and a small series (with drawings of larvee and pupze) forwarded by the late Dr. J. E. Seaman. ZULULAND.—A small collection made at St. Lucia Bay by the late Colonel H. Tower in 1867, and numerous specimens captured by Colonel Bowker in 1880. SwazILanp.—A few examples (with notes of localities and coloured photographs of many species taken) from the late Mr. K. C. Buxton. Detacoa Bay.— An interesting series (accompanied by some good sketches and notes) from Mrs. Monteiro. TRANSVAAL. — A fine collection, in the best order, formed by Mr. T. Ayres, and acquired by the Trustees of the South- African Museum in 1879; a small series collected by Mr. F. PREFACE. xiil and Mr. H. Barber; a large number from Mr. A. W. Eriksson ; and a considerable collection made by Mr. F. C. Selous. The four gentlemen last named have all contributed in addition many butterflies from the Tropical Interior extending to the Zambesi Valley ; and for many specimens from Damara- land I am indebted to the late Mr. C. J. Andersson, Mr, J. A. Bell, Mr. J. J. Christie, and Mr. W. C. Palorave. To the kindness of Mr. P. MacOwan, Director of the Botanic Gardens in Cape Town, I am indebted for the identi- fication of many food-plants of the larve of South-African butterflies. The assistance rendered me by entomologists in Europe has been invaluable, and my only regret is that my visits to England have been too few and brief for more fully availing myself of the liberality with which access to their collections was awarded me. The treasures of the magnificent National Collection in the British Museum have always been open to me through the courtesy of the officers of the Zoological Depart- ment, and I cannot sufficiently thank my friends Mr. A. G. Butler and Mr. W. F. Kirby for the cordial manner in which, for many years past, they have in every way furthered my researches. ‘The limits of a preface preclude a full mention of the many friends who have lightened my labours, but I give myself the pleasure of specially thanking Mr. H. W. Bates, Mr. W. L. Distant, Mr. F. Du Cane Godman, Professor R. Meldola, Mr. F. Moore, Mr. O. Salvin, Mr. H. Grose Smith, Mr. A. R. Wallace, and Professor Westwood. Among Continental entomologists, I must express my special obligations to Mr. P. O. C. Aurivillius, of the Royal Museum in Stockholm, who not only sent for my examination typical specimens from Wahlberg’s South-African collections described by Wallengren, but also procured for me some ad- mirable figures of a few unique types in the same collections, besides presenting me with his own valuable publications treat- xiv PREFACE. ing of African butterflies. I had previously received from my kind correspondent, Pastor H. D. J. Wallengren of Farhult, a series of his papers on the above-named and other collections, and found them of the greatest assistance. I am glad to acknowledge, in conclusion, the liberal con- tribution to the cost of publishing this work which has been made by the Trustees of the South-African Museum, who, regarding it rightly as constituting a full and permanent record of the South-African butterflies in the Museum Collec- tion, have subscribed for copies to the value of £100. ROLAND TRIMEN, Museum RESIDENCE, CAPE Town, 16th February 1887. CONTENTS. INTRODUCTION. I. Tuer Crass Insecta ; ; : 2 oe II. Toe Orver LEPIpoPTERra . 4 RHOPALOCERA . 5 Famity I.— NYMPHALIDAi ; 45 Sub-Family— Danan ! : 47 SATYRINA ; ; ; : : 62 ACREINE : : ‘ ’ 128 NYMPHALINA: 185 SYSTEMATIC INDEX : ; 349 EXPLANATION OF PLATE A, , ; 351 List or SpEciES FIGURED IN THE PLATES : 353 As re ¥ | en nee Reet: aa i es Cree aa ne ait sie? ? eit Hes! Hy Fe A « a ey Sener INTRODUCTION. I.—THE CLASS INSECTA. As the Lepidoptera (Butterflies and Moths) are an Order of the Class Insecta or true Insects, a few words are requisite to indicate the structure of these animals. The entire class is associated with three others, viz., the ARACHNIDA (Spiders, Scorpions, &c.), the Myriopopa (Centipedes, Millipedes, &c.), and the Crustacea (Crabs, Lobsters, &c.), to form the great sub- kingdom ARTHROPODA. This immense assemblage is characterised by the body consisting of a series of rings or segments (somites) bearing hollow jointed limbs; and by the integument being so hardened and solidified by the peculiar deposit chitine, as to constitute a more or less rigid external skeleton to which the muscles are attached. The rings or segments of the body succeeding those which unite to form the head do not, as in the higher members of the sub-kingdom Vermes, present a repetition of the same structure throughout their series, but tend with more or less distinctness to form two separate groups or regions to which special organs and functions are allotted. These two unequal sets or groups of segments are respectively termed thorax (the anterior) and abdomen (the posterior) ; and, speaking generally, the organs and functions of locomotion may be said to reside in the former, and those of nutrition and reproduction in the latter. The CRUSTACEA are separated from the rest of the Arthropoda by a respiratory system working by gills (branchie), adapted to their aquatic life; while all Insects, Myriopods, and Arachnids are alike in direct aérial respiration by breathing-tubes (¢vachew) traversing the body and opening on its exterior by stigmata,—or (in the case of certain Arachnids only) by pulmonary sacs. Associated with this important distinction there are others of much note in external structure. Thus, the Crustacea have two pairs of antennw,—other Arthropods but one pair; in the former there is a second pair of inferior Jaws (mazille) functionally active,—but these in the other classes are united to form the under-lip (Jabiwm); the abdominal limbs of Crustaceans have no representatives in adult Insects or Spiders (though homologous append- VOL. I. A 2 SOUTH-AFRICAN BUTTERFLIES. ages exist in the Myriopoda); nor are the prevalent stalked or pedun- culated eyes of Crustaceans to be found in the other classes, except in a very few instances—and in these the stalked eyes are immovable. The’ nervous system of the Arthropoda is situated inferiorly, con- sisting of a double nerve-cord presenting a pair of swellings or nerve- centres (ganglia) at intervals, the total number of which normally corresponds to that of the segments, but varies in proportion as the more or less intimate union of the segments in groups accompanies the coalescence of certain ganglia. From the ganglia proceed nerves extending to the various organs; and, between the two pairs (superior and inferior) of the head which constitute the “ brain,” passes the gullet (esophagus). The upper (“cerebral”) of these two pairs supplies the nerves of the antennze and eyes, and the lower (“ cerebellar”) those of the organs of the mouth. The three pairs of the thorax emit nerves to the muscles of that region, and to the legs and wings (if any) attached to it; in some of the higher Jnsecta these thoracic ganglia are combined to form a single nerve-centre, while in others the middle and hind ganglia only are united, leaving the front pair apart. In addition to this main system there is a second visceral one, also ganglionated, which originates in the cerebral ganglia, and is distri- buted to the gullet and stomach. These latter organs, with the rest of the alimentary canal and its accessory glands, lie centrally along the body, above the main nervous system, but beneath the circulatory or blood-vascular system; which latter consists of a long-chambered dorsal vessel or “ heart,” situated along the middle line of the abdomen, and terminating anteriorly in a thoracic aorta. The reproductive system is elaborately developed, and the sexes are Separate—except in the cases of certain low Arachnids (Tardigrada), and of the probably degenerated Crustaceans known as Barnacles (Cirripedia). The Arthropoda are with but few exceptions oviparous, but some produce the larve already hatched. Among the three classes of air-breathing or tracheated Arthropoda, the INsEcTA are, as their name implies, specially distinguishable by the very marked division of the body into the three separate portions of head, thorax, and abdomen. In the Arachnida the head and thorax coalesce into one mass (cephalo-thoraz), while in the Myriopoda the thoracic and abdominal segments exhibit no distinctly separate grouping. Insects and Arachnids agree in never having any jointed limbs attached to the abdominal segments; but the former never have more than six (three pairs) ambulatory or walking limbs, while the latter have eight ; and insects alone in the sub-kingdom are provided with wings. These organs are not true limbs like the hollow jointed legs, but merely expansions of the integument, springing from the sides of the middle and hind segments of the thorax; they are traversed, and at the same time extended and supported by hollow, horny, stiff, rib-like tubes, INTRODUCTION. : known either as veins or nervures. The possession of six thoracic legs only, and of four thoracic wings, are the unmistakable marks of Insects properly so called. The number and position of the legs are quite constant; but the lowest groups (Collembola, or “ Spring-tails,” and Thysanura, or “ Fish-insects”) have no wings, the Diptera (House- flies, Gnats, &c.) have the hind pair of wings undeveloped, and in all the winged Orders cases of wingless forms occur. Closely associated with the possession of wings—which is the exclusive privilege of the adult insect—is the more or less complete metamorphosis, or series of changes from one stage or state of develop- ment to another, undergone in the course of progress from the egg to the Imago, or perfect Insect. This is very striking in those Orders (Lepidoptera, Diptera, Hymenoptera, Newroptera, and Coleoptera) in which the Jarva is cylindrical and worm-like, and the pupa, or chrysalis, perfectly quiescent and helpless; while in the others (Hemiptera and Orthoptera) the close resemblance of the larva when hatched to the adult, with the result that there is no true pupal state, but unbroken activity throughout life, renders the acquisition of wings a matter of more gradual and apparent development, as the successive casts of skin or moultings are gone through. While the Orders of Insects were named by Linnzeus, and are still for the most part conveniently grouped, in accordance with characters peculiar to the wings, a more trustworthy basis for their classification, as far as external structure is concerned, is found in the parts of the mouth. When these are carefully studied, they are found in the several Orders to be fairly constant modifications of the typical insect-mouth, which consists of (1°) a single horny upper lip (/abrwm) articulated to the fore-part (clypeus) of the head; (2°) a pair of principal seizing or biting jaws (mandibles); (3°) a pair of accessory masticatory jaws (mawille); and (4°) an under lip (dabiwm), which is formed by the more or less complete coalescence of a second pair of maxille. This typical form of mouth, so well adapted for seizing, holding, and tearing up food, is most fully shown in the Orthoptera (Grasshoppers, Praying- insects, Leaf-insects, Dragon-flies, &c.), and Coleoptera (Beetles). In the Neuroptera (Ant-lions, Lace-wing flies, Caddice-flies, &c.), while the masticatory type prevails, there exist certain groups in which there is modification towards a suctorial type (Panorpide), or con- siderable atrophy of the mouth-organs generally (Phryganeide). In the Hymenoptera (Ants, Bees, Wasps, Ichneumon-flies, &c.), there is a series of gradations from the masticatory to a combined masticatory and suctorial mouth. Lastly, the Orders Hemiptera (Bugs, Cicadas, Aphides, &c.), Diptera (House-flies, Gad-flies, Gnats, &c.), and Lepid- optera (Butterflies and Moths) are exclusively suctorial, the mouth- organs being profoundly modified to form a channel for liquid food. As compared with the other two suctorial Orders, in which all the typical mouth-parts are well expressed, though altered in order to the 4 SOUTH-AFRICAN BUTTERFLIES. formation of the beak-like proboscis (rostrum), the Lepidoptera exhibit a remarkable suppression or abortion of all the organs except the maxilla, which are greatly lengthened and so shaped as together to form a tubular “trunk” (haustellwm), capable of being rolled up spirally when not in use. NREL ORDER LEPIDOPTERA, From what has been stated above, it will be apparent that the Butterflies and Moths belong to the higher or more specialised Insects, distinguished by a more concentrated nervous system, and accompany- ing compactness and very distinct partition of the three regions of the body, as well as by the complete metamorphosis they undergo, From the latter character, the five Orders Hymenoptera, Lepidoptera, Diptera, Neuroptera, and Coleoptera, constitute a Sub-Class named Metabola. The following may be regarded as the distinguishing features of the LEPIDOPTERA, Viz. :-— (a.) Imago (or Perfect Insect), Body and limbs clothed with scales and hairs. Head with the labrum, mandibles, and (except in some of the lower Moths) maxillary palpi, rudimentary; but with the maxille elongated and modified into a tubular haustellum; Jabium much reduced, but the labial palpi moderately developed and laterally com- pressed, forming a protection to the haustellum when coiled up. The lateral compound eyes large and prominent; two simple eyes (stem- mata) on the vertex in some groups. Antenne many-jointed, very variable in shape and structure, inserted on upper part of head, between compound eyes. Thorax very compact and robust; its first segment (prothoraz) very small, bearing the first pair of legs; its second segment (meso- thorax), bearing the first pair of wings and second pair of legs, much enlarged, and constituting the mass of its bulk; its third segment (metathorax) small, bearing the third pair of legs and second pair of wings. Prothorax also bearing dorsally a pair of small, horny, scale- like organs (patagia); mesothorax bearing laterally, immediately above the bases of the fore-wings, a pair of similar appendages (tegule or pterygodes). Wings very large, exceptionally broad, not folding (except longitudinally in the hind-wings of many, and the fore-wings of a few Moths), clothed with scales both above and beneath. Legs short and weak, little used for walking (especially the first pair, reduced to atrophy in many Butterflies); the coxee immovable, solidly affixed to the thorax; the middle and hind tibie armed with a pair of spurs at their extremity, and the hind ones (except in the typical Butterflies) with a second pair rather beyond their middle ; the tarsi five-jointed (except in the fore-legs, when much atrophied). Abdomen composed of eight or nine segments, sub-cylindrical, INTRODUCTION. 5 elongate, compressed laterally; the anal and genital apertures at its extremity. (6.) Larva (or Caterpillar). Worm-like, cylindrical or sub-cylindrical, presenting aneieen seg- ments (taking the head as the first); the integument generally softer and more elastic than in the Imago. Head hard and horny, divided into two more or less distinct lobes by a frontal depression ; inferiorly these lobes are divergent, between them lying the clypeus. yes not compound, but tubercular and simple (stemmata), usually six on each side, situated in a ring at the lower end of the cephalic lobe. Antenne horny, small, short, conical, three- or four-jointed, situated inferiorly, between the simple eyes and the base of the mandible. Labrum of moderate size. Mandibles large, very hard, strongly and acutely toothed on their inner meeting edges. Labium and maxille united; the former lying between the latter, and presenting at its extremity a small tubular organ (spinneret) containing the common duct of the two silk-glands, and a pair of very minute palpi; the maxille small, much softer than the mandibles, conical, three-jointed, adapted for prehension (not mastication), bearing minute palpi near their extremity. Legs (true) six, borne on the three segments next succeeding the head (which answer to the thorax of the perfect insect), short, horny, cylindrical, composed of five short joints, of which the terminal one (tarsus) forms an acute curved claw. Posterior to the sixth segment, a series (two to five pairs) of highly retractile, stout, fleshy “ claspers ” or pro-legs, fringed at their extremity by numerous small hooked bristles." Breathing-pores (spiracles) lateral, inferior, a pair on each segment except the head, and the third, fourth, and thirteenth. (c.) Pupa (or Chrysalis). Elongate, more or less sub-conical, blunt anteriorly, and pointed posteriorly ; closely invested by a hard membrane, which binds the developing limbs of the future Imago closely to the breast and basal part of the abdomen, but leaves their form more or less defined ; mummy-like, quiescent, only the abdominal segments capable of motion. Regional boundaries of head, thorax, and abdomen distinctly defined by the sutures of the investing membrane (theca). Abdomen consist- ing of nine segments, gradually decreasing to the last, which is more or less acutely pointed. Hach abdominal segment except the last bearing a pair of lateral spiracles. The Eggs (ova) laid by Lepidoptera are very variable in form, being found globular, pyriform, regularly ovate, melon-shaped, &c., and the shell or external membrane is very commonly distinguished 1 The seventh, eighth, and ninth segments may want pro-legs (as in the Geometer larve), and very rarely the thirteenth or last segment (as in the Bombycid Dicranura), but the maxi- mum number is five pairs, and the minimum two pairs. The fifth, sixth, eleventh, and twelfth segments never possess pro-legs. 6 SOUTH-AFRICAN BUTTERFLIES. by intricate raised or impressed sculpturing of the most varied pat- terns. Their colouring also varies, and is often not uniform, but exhibits contrasted hues in the form of spots or bands." The number produced by the individual mother is usually large; and they are laid, singly or in smaller or larger groups, on the leaves, twigs, or trunks of trees for the most part,—a viscid fluid which invests them on exclu- sion usually in hardening glueing them to the surface on which they are deposited. On emerging from the egg, the young lepidopterous Larva or caterpillar is sufficiently advanced in general structure, and in the development of its mouth-parts especially, to enable it at once to begin a more or less active independent life of voracious eating and correspondingly rapid growth. The nature of the integu- ment (which, though not so hard as that of the perfect insect, is, nevertheless, the external skeleton to which the muscles are attached) is such that it does not admit of gradual accessions to suit the growth of the animal, but is only so far accommodating as its natural elasticity allows. It follows that, at a certain point of the animal’s increase in bulk, the too limited investing skin must be got rid of, and one of more capacity secreted in its stead. ‘The cater- pillar temporarily abstains from eating, and its skin becomes faded, dry, wrinkled, and detached as the new one is developed beneath it. The process of detachment is aided by the dilating and contracting of the segments, and by various other motions of the larva; and at length the old integument splits dorsally, and the insect emerges through the rent. The moult is a most complete one, extending to the head and legs, and even including the fine membranes of some of the prin- cipal internal organs. The new external skin (which often differs in colour or marking from the discarded one) soon hardens, and the caterpillar resumes feeding with increased zest, sometimes (as I have seen in Cherocampa Celerio), in the first place, devouring its old skin. This process of moulting has been recorded to occur from three to as many as ten times, but it appears seldom to take place more than five times. When the caterpillar has attained its full size, after some days it finally leaves off eating, and sets about the necessary preliminaries to assuming the pupa or chrysalis state. It commonly shows much rest- lessness at this time, wandering about in search of a suitable retreat ; and in those kinds which have smooth, brightly-coloured skins there is often a remarkable change to dull and sombre hues. It is now that the large reservoirs of silk are chiefly drawn upon, although the amount employed by members of different groups varies very greatly, from the mere disk to which the caterpillars of many butterflies hook their last segment to the full cocoon fabricated by those of the typical ’? 1 Coloured figures of the eggs of forty-two European species are given by M. Th. Goosens in illustration of his memoir, ‘ Les Giufs des Lépidoptéres,” in the Annales Soc. Entom. de France for 1884 (October). INTRODUCTION. 7 Bombycid moths, so well represented by the common silkworm. Many caterpillars bury themselves in the ground before becoming pupe ; others lie on the surface, only drawing together a leaf or two by silken attachments; some introduce particles of sand, earth, or wood into their cocoons, many hairy larve even interweaving their own hairs ; and in others, again, a higher degree of protection is obtained by the abundance in the material of a hard-setting gummy secretion. In those cases where the pupa is wholly exposed (as in nearly all butter- flies), or is in the incomplete open-meshed sort of cocoon, there is no difficulty in observing the changes in the form of the caterpillar prior to its last moult, which consist mainly in its contracting to much shorter, but at the same time thicker, dimensions, in the acumination of the abdominal region, and in the shrinkage and withdrawal from external projection of the head and legs. The abdominal pro-legs now finally disappear, and it is only in the last cast-off skin of the larva that any record of their having existed remains. The caterpillars of Lepidoptera exhibit considerable variety in general form, those of several groups not presenting the ordinary sub-cylin- drical elongated shape so familiar to all in the silkworm, but being more or less widened, shortened, and depressed. Some have the skin smooth, while in others it is more or less roughened or granulated ; and in a great number of others it is set with hairs, bristles, or spines. Among the hairy kinds there is immense diversity in the distribution and arrangement of the hairs, which are sometimes generally dispersed, but as often disposed in tufts, or springing from tubercles, or arranged in bands or local stripes and patches. Some of the more rigid and acute spines in the larve of certain Bombycid moths are modified into weapons both defensive and offensive, being not only exceedingly sharp and serrated, so as to pierce and greatly irritate, but grouped in clus- ters or fascicles exsertible at the will of the animal. No other insect larvee approach caterpillars in beauty and variegation of colour and marking, whether we look to the smooth or hairy kinds. The few almost colourless or very dull-coloured caterpillars are those that live in the stems or at the roots of plants. The prevalent colour is green, and this is highly protective in concealing from their enemies creatures feeding almost entirely on leaves. But some of the most brillantly variegated patterns of caterpillars are really protective in nature, as is well seen among the very large and beautiful larvee of the Hawkmoths (Sphingide), where the stripes and spots of strongly-contrasted colours are adapted to the lights and shades, the outlines and tints, of the leaves, twigs, and buds of the plants the larvee frequent. Where this adaptation to surroundings does not prevail, it has been found in many cases that the gaudy, conspicuous caterpillars are unpalatable to birds and other insectivorous animals, and so are not liable to the persecution so generally experienced by their tribe. Some caterpillars of moths (Psychide, and many of the Tinew) construct from the first a descrip- 8 SOUTH-AFRICAN BUTTERFLIES. tion of cocoon which they carry about with them, and from which only the head and front segments bearing the legs protrude. These silken fabrics are externally both strengthened and disguised by attached pieces of objects among which the larva lives, such as woollen tissue (in the case of the Clothes-Moth caterpillars), sand, small particles of stone, bits of grass, or sticks. In the case of many of the latter, the bits of grass or sticks are most neatly cut of the required length, and firmly secured in most regular order, the whole resembling the conventional fusces of the Roman lictor. Caterpillars are, apparently, of all insect larvae the most liable to attack by the parasitic Hymenoptera, known as Ichneumon-flies (families Ichnewmonide, Chalcidide, &c.). The female fly is provided with an acute ovipositor, by means of which she pierces the caterpillar’s integument, and introduces her eggs. The grubs of the Ichneumon-fly soon hatch in the caterpillar’s body, and begin to devour its tissues. They appear to avoid injuring the vital organs, and to derive nearly all, if not the whole, of their sustenance from the spacious fat-body (corpus adiposum) which envelops the caterpillar’s alimentary canal, &c., and fills almost all the space between those organs and the body-walls. The caterpillar so infested usually lives to attain its full size, and sometimes to assume the chrysalis form, but it never reaches the perfect state, its devourers either emerging to spin their own little cocoons around its skin, or undergoing their metamorphosis within it. Other deadly parasites are the species of Tachina, flies of the Order Diptera, which fasten their eggs on the surface of the caterpillar, into whose body the maggots hatched from them penetrate. There is much difference among caterpillars as regards activity of motion. Those of Butterflies are for the most part remarkably sluggish, scarcely moving except from one leaf to another, and those of the Hawkmoths and higher Bombyces are as a rule but little more active. Among the latter, however, the well-known hairy larve of the lovely Tiger-Moths (Arctiidw) are an exception, being frequent and rapid walkers. The caterpillars of many of the lower groups of moths (Noctuce, Pyrales, Geometre, and Tortrices) are very quick in their motions, a few even exhibiting the power of leaping away when dis- turbed. The Geometra larvee almost invariably have only two pairs of “claspers” or pro-legs, situated posteriorly on the tenth and thirteenth segments, with which peculiarity is associated the mode of progression which led to their name; this consisting of their stretching out the body forward and grasping with the true legs near the head, and then bringing up the pro-legs close to the others, so that the long inter- mediate legless portion of the body is looped or arched. In this way they proceed by long-measured steps, instead of by the continuous undulatory motion of caterpillars with the full complement of pro-legs. These Geometer larvee have in a great many instances the extraordinary power of keeping the body for hours rigidly extended from its base of INTRODUCTION. 9 attachment by the four posterior pro-legs, at a very considerable angle to the twig on which it rests. This strange attitude, in association with special colouring and configuration, is eminently protective, render- ing the caterpillar almost indistinguishable from the twigs it frequents. Many caterpillars of Noctuw, having in addition to two pairs of pro- legs possessed by the Geometers only one pair (on the ninth segment), approximate the latter in their mode of progression, and are commonly known as “ half-loopers.” While nearly all lepidopterous larvee are solitary, or only found in close proximity owing to their having been hatched more or less re- cently from a cluster of eggs, there are a few among those of moths which are distinctly social, constructing a common silken nest in which they remain until eventually assuming the chrysalis state. The most re- markable of these social larvee are those of the so-called ‘ Processionary ” Bombycid moths, which not only live in community, but, when they leave the nest, proceed in long columns widening from the single leader to many abreast, and return, after feeding, in the same regular order." On its first disclosure by the moult of the last skin of the cater- pillar, the lepidopterous Pwpa or chrysalis exhibits a soft moist sur- face, usually of a greenish or yellowish tint, the viscid secretion upon which gradually hardens into a rather thin, but hard and firm, outer casing or horny shell, closely investing the entire body, and binding flatly upon the breast and sides the incipient trunk (haustellwm), antenne, palpi, legs, and wings. It is very remarkable that in the chrysalis, from the very first, these various limbs are all distinctly present in outline, or in mould as it were, and ‘are to a great extent free from the body at first, though subsequently the investing secretion glues them down. Pupze, leading an absolutely quiescent life and requiring no food, present but little variation in comparison to the larve. In form, be- sides being more elongate and slender in some groups than in others, the only marked difference is presented by the chrysalides of most butterflies, in which the head and thorax are more or less sharply angulated. The surface in some is very smooth, but in most more or less granulated or pitted. Many of the angulated butterfly chrysalides bear on the back of the abdomen two rows of tubercles, usually more or less pointed, and in a few cases prolonged into spinous processes. Some of the Bombycid pups (Liparide), and also that of a South- African Lyceenid butterfly (D’ Urbania), have dense tufts of hair. The colours of pupz are considerably varied in the case of those fully exposed to the light or in very thin cocoons, but limited to various 1 A characteristic ‘‘ Processionary ” inhabits the eastern part of Cape Colony and Natal ; it is the Anaphe Panda of Boisduval. Westwood long ago described a Mexican Pieride butterfly (Zucheira socialis), the larvee of which “ construct a very strong parchment-like bag, in which they not only reside, but undergo their change to the pupa state ;” but he has not recorded, I believe, whether these caterpillars are processionary. 10 SOUTH-AFRICAN BUTTERFLIES. shades of reddish-brown, deep-brown, or blackish in those enclosed in dense cocoons or buried in the earth. The immense majority of butter- fly chrysalides are included in the former class, and some of them (Nymphalide) exhibit the brilliant golden spots or patches which gave origin to the name of chrysalis or awrelia. But much of the colouring of these exposed pupze is protective, closely resembling that of the objects to which they may be attached; and, as has of late been discovered, the general tint of different individuals of the same brood will, in some kinds, be found to vary (within certain limits) in accord- ance with the colour of the-objects upon which they assume the pupal state.’ Besides this, there are instances where the form as well as the colouring aids in the protective resemblance, as Mr. Mansel Weale and I have shown in the case of the South-African Papilio Cenea ; and the hirsute chrysalis of D’Urbania amakosa, already mentioned, appears from Mrs. Barber’s observations to resemble certain lichens. growing on the rocks to which it is attached. The motions of lepidopterous pupz are very limited, and those of butterflies, whose caudal extremity is fixed to a silken attachment, are all but motionless. The abdominal segments have, however, consider- able freedom of movement in many moths, and such pupz, by the aid of a strong caudal spine (mucro)—and, in some cases, of a series of small dorsal spines on the other segments—are able to push themselves along, either in the ground or in the hollowed interior of the stems of plants. Many display this particular sort of activity when the perfect insect is about ready to emerge. The structural changes wrought during the chrysalis state of quiescence are astonishingly great. The body becomes distinctly divided into the three heteronomous portions of head, thorax, and abdomen, and covered with scales; ample wings are developed, also covered with scales; the pro-legs disappear, and the true legs as well as the antennee are much lengthened and completely altered in shape. The eyes are enormously enlarged and developed; and while the united maxille and labium are separated and profoundly modified into the long spiral sucking-tube (haustellum) and the under-lip bearing well-developed palpi, the large jaws (mandibles) are reduced to the merest rudiments. Not less profound are the accompanying internal changes, for the thoracic nervous ganglia become approximated and united into two masses, while the two basal pairs of the abdominal segments are aborted; the alimentary canal is differentiated into well- defined tracts of cesophagus, crop, stomach, &c. ; the silk-glands entirely | disappear; the great fat-body (corpus adiposwm) is almost wholly absorbed ; and the reproductive organs are fully developed. 1 One of the most remarkable cases of this kind is that of the pupe of the well-known South-African Papilio Nireus, recorded by Mrs, Barber in the Z'’ransactions of the Entomo- logical Society of London for 1874, pp. 519-521. The same observer informs me that the pupe of Callidryas Florella present quite a parallel case. INTRODUCTION. II What renders the transformation the more remarkable is the brief period in which it is commonly accomplished. The duration of the pupa state varies very much, and development is greatly accelerated by a high temperature and retarded by a low one. Among South- African species the shortest time I have noted is in the case of the common butterfly, Acrwa Horta, which remains only eight or nine days in the chrysalis form during the height of summer, but in the winter months of June and July is twenty-four days developing. As a rule, the smaller species produce the perfect insect much sooner than the large ones. The summer brood of Papilio Demoleus is from twenty- one to twenty-four days in the pupa state, but the offspring of this brood remain pup from April to September or October. Instances are, moreover, not rare in which certain individuals do not complete their development simultaneously with the rest of the brood, but remain arrested until the corresponding season of the next year, notwithstanding that all the conditions of food, temperature, &c., may have been identical as respects the entire brood. That this “ standing over” until next season of a certain number of the year’s brood must be of advantage to the species concerned can scarcely be doubted, but in what way it is brought about has not, to the best of my knowledge, been explained. When the Jmago, or perfect insect, of the lepidopterous Order makes its appearance from the cracked skin of the pupa, all its organs are completely developed with the exception of the wings. ‘The latter are short, thick, and much folded or wrinkled, but exhibit in miniature the colouring and marking proper to the species. They consist of two separate membranes, upper and under, and are traversed by hollow horny nervures situated between the two membranes, ‘The insect climbs to some situation where it can cling with the little moist crumpled wings hanging freely downward, so that they can gradually expand without obstruction,—a process effected by the steady extension of the nervures. The elongation and stiffening of the latter tubular organs seems to be due to their distension by introduced air, and partly also by the entrance of fluid matter from the body. As the membranes become stretched and tense they approach each other and _ finally coalesce. This growth of the wings to their full extent is aided by slight movements of the insect in turning from one side to the other, or partly spreading the wings. Except in some of the largest species the process is not of long duration, a few minutes suflicing in the case of the smaller Butterflies,) while in some of the largest Moths I have known it to occupy five or six hours. The Lepidoptera surpass all the other Orders of Insects in the immense size of their wings in comparison with that of the body. 1 One of the larger South-African Butterflies, a female Diadema Misippus, which I timed from the moment of its complete extrication from the chrysalis, was exactly fifteen minutes in acquiring the full expansion of the wings. 12 SOUTH-AFRICAN BUTTERFLIES. This is especially noticeable in the Butterflies, and reaches its maximum in the Morphite of tropical South America, in many species of which magnificent group it is difficult to comprehend how the small slender thorax can contain sufficient muscular power to work the enormous wings. The scales, which give to these organs their infinite variety of colouring and marking, and to the Order its name (Aezis, scale, mTTepov, Wing), are planted in the membrane by slender, very minute foot-stalks, and arranged so closely in transverse (not always quite straight) rows, that the basal portions of the scales of each row are hidden by the overlapping outer portions of those of the next row. These scales are in themselves objects of remarkable beauty under the microscope, their shape presenting a wonderful variety of outline, and their surfaces being covered with raised longitudinal and transverse lines forming a reticulation of the utmost minuteness and delicacy.” The entire Order consisting of insects which live solely on fluid nutriment, there is not much variation in the mouth-parts except as regards the adaptation of the trunk or haustellum (modified maxille) to obtaining liquid from various sources. A certain number of Moths take no food, their trunk being rudimentary ; these mostly belong to the group Bombyces, of which the common Silkworm Moth is a familiar example. The great majority of Lepidoptera, however, is in the per- fect state dependent on the honey of flowers, and the trunk varies ereatly in length in accordance with the form of the nectar-yielding blossoms frequented. The nectaries of many flowers are shallow and open, and to rifle these a short haustellum suffices; but where the honey les in a long tubular receptacle, a proportionately elongated trunk is necessary. The greatest development of this kind is reached in the typical Sphingidw, or Hawkmoths, which are thus enabled to take their food on the wing, without settling, and to reach supplies shut out from all other members of their Order. Thus, the haustellum of the common and widely-distributed Unicorn Hawkmoth (Sphinx Convolvuli) is four inches long, or twice the length of the whole body ; and a huge South-American ally, Amphonyx Cluentius, has a trunk over nine inches in length. The in many ways aberrant Death’s-Head Hawkmoth (Acherontia Atropos)—as well-known and much-dreaded in South-Africa as in other parts of the world—has, on the contrary, a short, stiff, broad proboscis, specially adapted for piercing the waxen lid of, and abstracting the honey from the cell of the hive-bee. Again, various large Voctwe—such as the well-known South-African Achaea Chameleon—-are able to pierce the skins of peaches and other fruits, 1 Thus in Morpho Iphictus the whole body is but an inch long, and the thorax less than half an inch long and a quarter of an inch in breadth, while the fore-wings not only expand six and a half inches from tip to tip, but are two inches broad at the outer edge, and the hind-wings are each two and a half inches long and two inches broad. 2 A favourite “test object ” for some powers of the microscope has long been the scale of a Morpho Butterfly,—a good glass giving clear definition of the delicate ridges on the surface of the scale. INTRODUCTION. re and the end of their trunk (as has been well shown by Mr. F. Darwin in the case of the Australian Ophideres fullonica, which penetrates even the rind of oranges) is bayonet-shaped and armed with saw-like teeth and ridges. The antennz of Lepidoptera have the characteristics of being well- developed and many-jointed throughout the Order, and in the great majority of genera long and conspicuous. ‘The shortest antennz are found in the Moths known in England as “ Ghosts” and “ Swifts” (family Hepialide), and the longest in the so-called “ Long-Horns ” among the smallest Moths (family 7ineide). Their form varies greatly, from the simple thread-like (/iliform), or gently tapering (setiform), to the doubly comb-toothed (bipectinate) or feathered (pluwmose). Their office has not yet been certainly made out; they do not appear to be employed as many insects of other Orders use them, viz., as feelers or organs of touch ; but, if they are the seats of any special sense, it seems probable, from the fact of their being, in very many cases, much more highly developed in the male sex, that they are olfactory." The pro- minence of the antennz and the facility with which they can be examined, no less than the fact that their various forms are very characteristic in the main of certain large natural groups, have led to the employment of these organs as representative ones in separating and naming the divisions of the Order. Duméril, in 1823, proposed four such divisions ; of which the first, Ropalocéres, comprised the Butter- flies or Clubbed-Horns, having the antenne knobbed or thickened: at the tip ; the second, Closterocéres, the Moths whose antennz are thickened about the middle (fusiform), included the Sphinges or Hawkmoths ; the third, Nematocéres, or Thread-Horns, contained the Bombyces; and the fourth, Chétocéres, or Bristle-Horns, was composed of all the remain- ing Moths. The last of these divisions was a most heterogeneous assemblage, and neither it nor the two preceding divisions (which are comparatively natural ones) have been adopted by any lepidopterist ; but the first, Rhopalocera, was accepted by Boisduval in 1836, and by Westwood in 1840. The former of these authors professed himself unable to separate the Sphinges from the other Moths as a primary division of the Order, and united all Duméril’s three groups into one, which he styled Heterocera, or Varied-Horns; and in this also he was followed by Westwood, who stated that he could not admit the minor divisions of the nocturnal Lepidoptera “ to a rank equivalent to that of the whole of the Diurna.” ‘This simple partition of the Lepidoptera into the two great groups of those with clubs or terminal thickenings of the antenne, and those without them (however variable the organs 1 It is noteworthy that the antenne are very highly developed in the males of those Bombycide which so readily discover the sedentary female under circumstances (such as enclosure in a shut box) which seem to preclude the employment by them of any but a sense of smell of extraordinary keenness. That this sense is the one exercised seems to be proved by the fact (to which I can testify in the case of Lasiocampa Quercus) that males are attracted by the empty box from which a female has been removed. 14 SOUTH-AFRICAN BUTTERFLIES. may be in other respects), has been generally adopted; and although not satisfactory—the greater of the two divisions being founded on a negative character—it is undoubtedly preferable to the older arrange- ment into Diwrna, Crepuscularid, and Nocturna, which were mere equi- valents of the original Linnzan genera, Papilio, Sphinx, and Phalena. The English terms, Butterflies and Moths, exactly correspond to these two Sub-Orders of Rhopalocera and Heterocera. The name Fhopalocera has been objected to on the ground that some Butterflies have no actual club or knob to the antennz ; but these exceptions are few, and even in them there is always, as far as I have seen, a slight and gradual thickening or incrassation towards the extremity of those organs. Herrich-Schiffer announced, in 1843, a further distinction in structure between the antennz of the two Sub-Orders—viz., that their joints (or at least those of the middle third of the organs) were in the Rhopalocera twice as long as, or much longer than, thick; but in the Heterocera about equal in length and thickness, or not longer than thick. oe The present work deals only with the South-African species of the first Sub-Order, viz., the Rhopalocera or Butterflies. RHOPALOCERA. Imaco.—Head of moderate size (rather large in the family Hespe- ride). Antenne slender; the joints of the middle third longer than broad; some of the terminal joints almost always broadened more or less, so as to form a club; bases of insertion close together (except in the Hesperide). Labial palpi well-developed, ascendent, three-jointed, scaly, more or less hairy (except in many cases the terminal joint) ; the middle joint almost always the longest. Haustellwm always well- developed (longest in the Hesperidew). Stemmata obsolete. Thorax compact, rounded anteriorly and posteriorly, usually rather thick and deep, with the sides somewhat flattened; mesothorax with its dorsal median suture and posteriorly-situated triangular scutellum usually very distinct. Wings large and broad, without the bristle and socket (retinaculum) found in most Heterocera;' general outline of fore wings sub-triangular, of hind wings sub-circular ; newration almost wholly longitudinal, with the exception of the disco-cellular nervules, and in its main plan the same in both fore and hind wings; near bases, especially in hind wings, usually a clothing of fine hairs as well as of scales; fringe of hair-like scales (cilia) projecting from outer edge (hind-margin) of wings usually short. Zegs slender, rather short ; the first pair often atrophied (family Nymphalide, and males of family Erycinide) ; femora generally hairy; tibiw and tarsi finely spinulose; tibie of hind pair armed with a terminal pair of spurs only (except in the Hesperidw, almost all of which have an additional pair rather beyond the middle of the joint); ¢arsi terminating in a pair of simple or bifid claws, usually accompanied by a foot-cushion (pulvillus) and two bifid supplementary membranaceous claws (paronychia). Abdomen short (except in the Sub-Families Danaine, Heliconine, and Acreine), slender, laterally compressed, dorsally arched, and with more or less of a median ridge; the extremity inferiorly obliquely truncate, and fissured longitudinally for the anal and genital outlets. Larva.—Usually elongate and sub-cylindrical (but widened and inferiorly flattened—onisciform—in Family Lycenide and in some 1 This structure, which links together the fore and hind wings in many Moths (and is particularly well shown in the Sphinges), is formed by the free precostal nervure at the base of the hind wing passing through a small horny loop or ring, which arches the subcostal nervure near the base on the under side of the fore wing, 16 SOUTH-AFRICAN BUTTERFLIES. Erycinide) ; smooth, granulated, transversely ribbed, downy, or spiny ; always with ten pro-legs. Head often horned superiorly ; tail some- times forked. Pupa.—Smooth or granulated, usually more or less angulated: head with one more or less acute anterior median projection, or two divergent ones; thorax dorsally prominent or humped; abdomen often dorsally tuberculated, rarely spinose. Attached by the tail to a silken web, and either hanging free vertically or braced horizontally or at an angle by a silken girth. Not enclosed in any cocoon or covering (except in a few Papilionide and the Hesperide generally, which are partly enclosed in a leaf drawn together by silken threads, and certain Satyrine and Lycenide which are hidden in the ground). 1. DISTINCTIVE CHARACTERS OF RHOPALOCERA. In the diagnosis of the Sub-Order given above, the more promi- nent characters distinguishing Butterflies are, in the perfect insect, the long-jointed and clubbed antennz ; the absence of stemmata or simple eyes, of retinaculum, or retaining ring and bristle,’ and of transverse or reticulated neuration in the wings; and the want (except in one Family) of a second pair of spurs on the tibize of the hind-legs. There do not appear to be any points of structure in the larve or pupe which are not discoverable among those of the Sub-Order Heterocera ; although it is quite an exception to find any pupa of a Moth angulated, freely exposed, or suspended by caudal and median silken attachments, like those of nearly all Butterflies.” There are, however, some secondary characteristics of Butterflies which are worth noting, although not absolutely peculiar to them. The first of these is the distinctness or definition of the colouring and marking of the under side of the wings, which usually displays an entirely different pattern from that of the upper side, and is often more elaborate in decoration, and sometimes more brilliant and varied in hues. The second, which is evidently in close relation to the first, is the almost universal habit of holding the wings vertically when at rest, by which attitude the under side of those organs is (often for a long 1 Blanchard employed the presence or absence of this character, in naming his two divisions of the Lepidoptera respectively Chalinoptera (= Heterocera or Moths), and Achali- noptera (= Rhopalocera or Butterflies). 2 Until recently I was not aware that any Moth chrysalis existed which was attached by the tail only, in the manner so frequent among Butterfly chrysalides, but this case has occurred to me (August 1884) in rearing what I believe to be an aberrant member of the Tortrices from larve tunnelling the woody receptacle of Protea mellifera. The larva was of the ordinary sub-cylindrical form, but the pupa was in appearance intermediate between the Lycnid and Hesperid types, and, to my astonishment, was attached horizontally to the lid of a breeding-cage by the tail only, quite in the manner of several species of Lycenide. The three larvee I had all assumed the pupal state in this position, but only one imago was pro- duced. The stout, thick pupa, alike in colour, size, and shape (except for a small pointed projection on the front of the head) nearly resembled that of Thecla Lynceus as figured by Duponchel (Zeonogr. Chen., pl. viii. fig. 31). RHOPALOCERA. 17 time) fully exposed, while the upper side is concealed. In Moths the under side of the wings is nearly always duller and paler than the upper side, and any pattern or colouring presented more or less indicates what is on the upper side; and these Lepidoptera, instead of holding the wings erect over the back, deflect them at various angles when at rest, and for the most part so dispose them that the longitudinally folded hind-wings and the abdomen are covered or roofed by the fore- wings. ‘The only group of Moths containing numerous exceptions to this rule is the Geometre, and it is very noteworthy that these alone have the rhopalocerous habit of resting with wings erect. A third distinction of Butterflies is their diurnal flight; but, as certain groups are crepuscular (many Hesperide, some Morphite, all the Brassoline, and a number of Satyrinw), and as a great variety of Moths in all the great divisions, including some entire Families (Zyenide, Uranide), are diurnal in their habits, this can only be taken as much more characteristic of Butterflies as a whole than of Moths as a whole. 2, CLASSIFICATION. A satisfactory arrangement of the Sub-Order is admittedly most difficult to arrive at, the fundamental structure of its members (as indeed may be said of the entire Order Lepidoptera) presenting but comparatively slight modifications, and those being often inconstant in character. As regards the Jmago, the most important features from a classificatory point of view are (1°) the neuration of the wings, (2°) the condition of development of the first pair of legs, and (3°) the presence or absence of a second pair of spurs on the hind pair of legs. In the Pupa, the mode of its suspension affords the most trustworthy character, while in the Larva the general form, the nature of the dermal append- ages, and the smooth or spined condition of the head, are points of chief importance. It is remarkable that in proportion to the atrophy of the first pair of legs, which is ¢he character in which the higher Butterflies differ most absolutely from all Moths, the chrysalis is free from silken attachments. Thus the pupe of the Hesperide, the group of Butter- flies in all respects most intimately related to Moths, and whose fore- legs are invariably fully developed in both sexes, are not only attached by the tail and girt with silk, but also secured by many silken threads, which in many cases form a slight cocoon. ‘Those of the Papilionida, a family which also has the fore-legs perfect in both sexes, are always attached by the tail and also girt; and, in the case of the remarkable Alpine genus Parnassius, the chrysalis, like those of the Hesperide just mentioned, is further enclosed by many additional silken threads, It is when we come to the Zycenide, in which, although the fore-legs of the female are perfect, those of the male begin to exhibit the failure of the tarsal articulation and claws, that we first find instances of chrysalides _attached by the tail only, but still in a fixed horizontal or slightly B 18 SOUTH-AFRICAN BUTTERFLIES. inclined position. Going on to the Hrycinide, the males of which have the fore-tarsi smooth and reduced to two joints (or even one only), there appear first a series of girt pupa, then one of ungirt but rigidly inclined pupee, and finally—in the Sub-Family Libytheine—pupe sus- pended freely by the tail. This last mode of suspension is universal in the Nymphalide, the perfect insects of which display reduced and atrophied fore-legs in both sexes. In the males of these tetrapod or “ four-legged” Butterflies, and even in the females of some in the Sub- Families Danaine and Satyrine, the fore-legs are so reduced as to be © hardly noticeable in their folded position against the prothorax. In the neuration the most serviceable distinctive characters are to be found in the number and points of crigin of the branches or nervules of the subcostal nervure of the fore-wings, and in the completeness or otherwise of the transverse or oblique disco-cellular nervules, which serve to connect, in both fore and hind wings, the discoidal or radial nervules (the main trunk or nervwre of which is atrophied in all Butter- flies), with the subcostal nervure above them and the median nervure below them.’ The short disco-cellular nervules in question constitute the outer limit of the so-called discoidal cell, lying between the subcostal and median nervures; when the lowest of these nervules is developed the discoidal cell is said to be closed, and when it is obsolete or rudi- mentary the cell is styled open. As regards the presence of a second pair of spurs on the tibie of the hind-legs, this is among Butterflies a feature of the Hesperidw only. But this aberrant and curious family, by common consent the nearest to Moths, possesses a kindred feature common and peculiar to itself and the Papilionine only, viz., a process or expansion, sometimes acuminate, on the inner side of the tibia of the fore-legs. Further aids to the scientific arrangement of the Butterflies are to be found in the length and gradual or abrupt clavation of the antenne ; the size and clothing of the labial palpi; the smoothness or downiness of the compound eyes; the size, shape, clothing, and texture of the wings, and the prevalent colouring and pattern of the latter organs. The two last named of these are of considerably more weight in the Lepidoptera than in the other Orders of Insects; the coloured scales on the immense area of the wings being apparently affected in their arrangement and tints in direct relation to any modification arising in the species, and so serving, as Mr. Bates has well observed,” as natural tablets on which are registered all the changes of organisation, however small. The claws at the end of the tarsi, with their curious appendages (first illustrated carefully by M. Doyére in 1843, and afterwards so 1 T adopt Doubleday’s modification of Lefebvre’s analysis of the system of neuration in the Lepidoptera, given by the former in the Zransactions of the Linnean Society, 1845, vol. xix. pp. 477-485, and in Genera of Diwrnal Lepidoptera, i. p. 31 (1847). * Naturalist on the Amazons, 2d edit., p. 413. RHOPALOCERA. 19 thoroughly examined by Messrs. Doubleday and Westwood in their Genera of Diurnal Lepidoptera), present features worth considering in comparing the structure of the different groups. The claws themselves (wngues) seem to be simple throughout the various Families, except in the Sub-Family Pierinw, in many genera of the Satyrine, and in a single species of Papilionine,' where they are more or less deeply bifid. But the appendages to the claws, termed pulvillus and paronychia, are more or less developed in all groups, except in some of the sub- family Danaine, in the Acreine, and in the Papilionine ; and they appear to attain their greatest development in the Sub-Family Nym- phaline. Taking into consideration all the details of structure above mentioned, and having regard to the earlier stages as well as to the adult or perfect state, an approximately natural arrangement of butter- flies is arrived at ; but, as is the case throughout Nature, the linear or serial classification, which for convenience has to be employed, can only very inadequately represent the affinities which exist. In consequence, originally, of Linné’s beginning his genus Papilio (equivalent to the whole group of Butterflies) with his so-named Hquites, and of these being naturally retained as the representatives of the restricted Papiliones, when that great genus was broken up into several others, it remained for many years the practice to place the Family Papilionide at the head of the Sub-Order Lhopalocera, and to put between them and the WHesperide all the remaining groups. Though Herrich-Schaeffer in 1843 (Syst. Bearb. der Schmett. von Europa, i. p. 16) amended this by commencing the series with the Nymphalides, continuing with the Libytheides and Hrycinides, and placing the Pierides, Lycenides, and finally the Equwitides, next above the Hesperides (which he separated altogether from the other Butter- flies); yet, mainly I think from the influence of Boisduval’s system, published in 1836, which placed the Suspensi (= entire Family Nymphalide) between the Succincti (= Families Papilionde and Lycenide and most Lrycinide) and the Jnvoluti (=Hesperide), the more natural classification was not adopted by entomologists generally. The magnificent Genera of Diurnal Lepidoptera of Doubleday and West- wood (1846-52) perpetuated the old arrangement, which was adopted by all English lepidopterists, and followed by myself in Rhopalocera Africe Australis (1862-66). The adoption of late years of the more natural system is mainly due to the able advocacy of it by Mr. H. W. Bates, whose memoirs dealing with the matter appeared in the Journal of Entomology (1861 and 1864) and in the Transactions of 1 One of the genus Leptocircus. Doubleday (Gen. Diurn. Lep., i. p. 23) records this exception, at the same time mentioning that in the only other known species of the genus the claws are simple! Blanchard, with evident reference to this case, abandons (Metam. etc. des Insectes, 1868, p. 160) the idea that the structure of the claws can be employed with any advantage in distinguishing genera or groups ; but this appears to me to be too sweeping a decision. 20 SOUTH-AFRICAN BUTTERFLIES. the Linnean Society, vol. xxiii. (1862).' Mr. Bates’s later arrangement, the details of which are given at p. 176 of the Journal of Entomology for 1864, will be followed in this work, and the linear order stands thus, viz. :-— Family I.—NyYMPHALID#. Sub-Family 1.—Danaine. 2.—Satyrine. 3.—Brassoline. 4.—Acreine. 5.—Heliconine. 6.—Nymphaline. Family I].—Erycryipa. Sub-Family 1.—Libytheine. i 2.—Stalachtine. aS 3.—LHrycinine. Family I1].—Lycznip4, Family [V.—PapiLionip#&. Sub-Family 1.—Pierine. » . 2.—Papilionine. Family V.—HEsPERIp&. In this classification the Family characters employed by Mr. Bates are those above mentioned, viz., the structure of the fore-tarsi in both sexes, and the mode of suspension of the pupa. For the grouping of the Sub-Families of the Vymphalide he relies firstly on the development or atrophy of the lower disco-cellular nervule at the extremity of the discoidal cell; secondly, on the shape and clothing of the larve ; thirdly, on the clothing of the palpi; and fourthly, on the presence or absence of a pre-discoidal cell in the hind-wings. He divides the three Sub- Families of the Zrycinide in accordance with the mode of suspension of the pupa, either freely by the tail only, rigidly in an inclined position by the tail only, or by the tail and a girdle.” The two Sub-Families 1 Mr. A. R. Wallace, whose opinion is entitled to the most careful consideration, opposed the removal of the Papilionide from the head of the Butterflies in his most excellent paper on the Malayan members of the Family in vol. xxv. of the same Zransactions ; and after I had, in vol. xxvi. (1869), adduced various structures in which the Papilionide showed their affinity to the Moths, he argued at length, as late as 1871 (see his Contributions to the Theory of Natural Selection, 2d edit.), in favour of their being retained at the summit of the Rhopa- locera, But in his Geographical Distribution of Animals (vol. ii. 1876) I was glad to notice that he had virtually abandoned his contention, by placing (p. 479) the Family at the end of the series, next above the Hesperide: 2 In a subsequent paper of great value on the entire Family Lrycinide (Journ. Linn. Soc., Zool., ix. p. 367, 1868), Mr. Bates gave up this character of the position of the pupa as distinctive of the Sub-Families, having found that in a species of Hmesis, one of the Ery- cinine, the pupa was suspended as in the typical Stalachtine. He omits the Libythwine, and arranges the Family into Nemeobiine, Eurygonine, and Erycinine, in accordance with the number of branches of the subcostal nervure of the fore-wings, and (in Hurygonine) the position of the lower radial nervule in the hind-wings. As it is preferable, for purposes of _ classification, to depend upon the characters of the imago, it will be well to accept this amendment, but at the same time not to exclude the Libythwine. RHOPALOCERA. 21 of the Papilionide are separated by the circumstance that in the Papilionine the inner margin of the hind-wings is hollowed or curved inwards, while in the Pierinw it is convexly prominent. The following tabular view of the Rhopalocera, in which only the characters of the Perfect Insects are employed, may be found helpful in determining the Family and Sub-Family to which any given butterfly may belong. Susp-OrpER RHOPALOCERA, A. Antenne close together at origin; tibie of hind pair of legs with a terminal pair of spurs only. B. Tarsi of first pair of legs imperfect, and the whole limb much re- duced in both sexes. Family I.—Nympnarips. ec. Discoidal cell of hind-wings closed. d. Hind-wings without a pre-discoidal cell. e. Palpi very short, slender. Sub-Family 1.—Danaine. ee. Palpi of moderate length or long, not slender. J. Fore-wings short, broad; their nervures often swollen at the base. Sub-Family 2.—Satyrine. Jf. Fore-wings much elongated, narrow; their nervures never swollen at the base. g. Tarsal claws without appendages, but much enlarged basally ; head of moderate breadth. Sub-Family 4.—Acreine. gg. Tarsal claws with paronychia and pulvillus; head very broad. Sub-Family 5.—Heliconine. dd. Hind-wings with a pre-discoidal cell. Sub-Family 3.—Brassoline. ec. Discoidal cell of hind-wings open or incompletely closed. Sub-Family 6.—Nymphaline. BB. Tarsi of first pair of legs imperfect in male, perfect in female. Family [1.—Erycinipa. h. Palpi very long. Sub-Family 1.—Libytheine. hh. Palpi of moderate length or short. z. Subcostal nervure of fore-wings with four branches. Sub-Family 2.—Nemeobiine. a. Subcostal nervure of fore-wings with from two to four branches; radial (or discoidal) nervule of hind-wings intimately connected with subcostal nervure. Sub-Family 3.—Hurygonine. 22 SOUTH-AFRICAN BUTTERFLIES. it. Subcostal nervure of fore-wings with three (in one species only two) branches; radial nervule of hind-wing somewhat dis- . connected from subcostal nervure, being united to it only by an imperfect transverse nervule. Sub-Family 4.—Erycinine. BBB. Tarsi of first pair of legs in male wanting one or both claws, but spined beneath ; perfect in female, Family I1.—Lycaniw2. BBBB., Tarsi of first pair of legs perfect in both sexes. Family IV.—Papinionip&, k. Tarsal claws bifid; inner margin of hind-wings prominently rounded. Sub-Family 1.—Prerine. kk, Tarsal claws simple ; inner margin of !hind-wings hollowed ; tibia of first pair of legs with a small process on their inner edge. Sub-Family 2.—Papilionine. AA, Antenne wide apart at origin; tibia of hind pair of legs with an additional pair of spurs rather beyond the middle. Family V.—Hesprrrip2. 3. GEOGRAPHICAL DISTRIBUTION. Taken as a group, Butterflies may be described as of almost uni- versal distribution over the earth, there being scarcely any known spots * (except in the Antarctic lands and islands) where in the summer, at least in favourable years, some species do not occur. In the highest northern latitudes yet explored various kinds have been met with, even Grinnell Land, in the extreme north of America (between lat. 78° and 83°), having yielded five species belonging to three families.2 The most southern known station of Butterflies is at the other extremity of America, several kinds inhabiting Tierra del Fuego, on the shore of the Strait of Magellan. These remote outposts are, however, highly un- favourable to butterfly existence, which finds its highest development in the Tropical Regions, and, speaking generally, thins out and wanes in proportion to distance from the equatorial belt. In the same way, as a broad rule, these insects become scarcer as a higher altitude is reached, although there are many peculiar and abundant alpine forms; and where flowering vegetation dies out, the limit of the actual habitat of Rhopalocera is found, seeing that the larve are exclusively, and the 1 Tceland is perhaps one; Dr. Staudinger, the well-known lepidopterist, having found no butterflies among the thirty-three species of Lepidoptera he collected in that island, But I believe he only collected during a single season ; and several butterflies have been reported as inhabiting Iceland. * See M‘Lachlan’s Report on the Insects collected on the Arctic Expedition of the “ Alert” and “ Discovery” in 1875-76 (Journ. Linn. Soe., Zool., xxv. p. 98, 1878). RHOPALOCERA. 23 perfect insects almost exclusively, dependent on the higher plants for food. It is very noteworthy that the Butterflies met with at great altitudes are of the same genera, and sometimes even of the same species, as those found in the highest latitudes; and this intimate alliance of high alpine and circumpolar forms points with unmistak- able significance—as in the parallel case in plants—to the long pre- valence of the last cold period or glacial epoch." Of the five Families of Butterflies, the Nymphalide, Lycenide, and Papilionide are the most widely and generally distributed; but two Sub-Families of the first of these, viz., the Heliconine and Brassoline, are peculiar to Tropical America (Neotropical Region), and the Sub- Family Papilionine of the third is very poorly represented in Europe and temperate Asia (Palearctic Region) and in North America. The Lrycinide have one Sub-Family, the Libythwinw, which (though con- sisting of but one genus and twelve species) ranges over the globe— without penetrating, however, into the coldest parts; but while the Nemeobiine have a few representatives scattered about the world, the great majority of them is Neotropical; and the remaining Sub-Families, Lurygonine and Hrycinine, are confined to America, where but very few of the latter exist north of Mexico, by far the larger part and all the Hurygonine being limited to the tropical (chiefly Brazilian) lands. The Hesperide, although very much more generally spread than the Erycinide, still find their metropolis in the wonderfully rich Neotropi- cal Region, twenty of the thirty-three genera recorded from there being peculiar to it, and several of those genera containing very numerous species. Two Sub-Families of the Nymphalidae, the Danaine and Acreine, may also be regarded as by no means of general distribution, because, although both have a very wide range of longitude, and the former group sends a few stragglers into the Nearctic and Palearctic Regions, they are almost wholly tropical and sub-tropical in their range ; the Danaine prevailing in the Neotropical and Oriental Regions, and the Acrewine in Africa and its islands (Ethiopian Region). Tropical’ America is undoubtedly by far the most productive region for Rhopalocera. Some idea of its riches may be formed from the facts that at Para, at the mouth of the Amazons River, a year’s collect- ing yielded Mr. Bates about 600 species; and that in four years, at Ega, on the Upper Amazons, he obtained 550 species, Parad has 1 As the climate in either Northern or Southern Hemisphere grew continuously colder, it seems clear—as so many able naturalists have pointed out—that there must have been a gradual retreat towards the equator of animals and plants of temperate latitudes, accom- panied by a simultaneous advance in the same direction of the organisms characteristic of the frigid zone. The geological evidence shows how very severe cold prevailed over the present temperate latitudes ; and it is reasonable to suppose that, when at length gradually rising temperature set in, and the organisms unfitted for a warm climate had to retreat in the direction of the pole, many animals and plants existing at the base or on the foot-hills of mountains would, as time went on, find their refuge at hand on the higher elevations, and finally remain isolated there, while their kindred were driven to higher latitudes, and sup- planted in temperate lowlands by the advancing forms from nearer the equator. 24 SOUTH-AFRICAN BUTTERFLIES. actually produced no less than 700 species. Mr. Wallace notes (Geogr. Distrib. of Animals, ii. p. 14) that no less than about 200 genera, or not far short of half the total number (431) of known genera, are peculiar to the Neotropical Region; and Mr. Kirby’s Cata- logue shows that more than half the entire number of known species have been found within its limits. The Oriental Region, consisting of Tropical Asia and the Indo-Malayan Archipelago, holds the second place, and yields an immense variety of forms,—Mr. Wallace observing that a few months’ assiduous collecting in any of the Malay islands will produce from 150 to 250 species, and that thirty or forty species may be obtained any fine day in good localities (Tropical Nature, &e., p- 74, 1878). Africa, so far as we know at present, is, in comparison with the two regions just mentioned, very poor; the whole number recorded for the Ethiopian Region (which extends to the Tropic of Cancer northward, and includes Madagascar and various groups of small islands) by Mr. W. F. Kirby? being but little over a thousand species. The Australian Region would be less productive than the Ethiopian were the continent of Australia alone to be considered, its poverty in butterflies, except in the north and north-east, being most surprising ; but when with Mr. Wallace we add the very rich Austro- Malayan islands, the number and variety are greatly augmented,— New Guinea, the Moluccas, and Celebes yielding a long series of splendid forms. The Palearctic Region, notwithstanding its enormous area, lies wholly beyond the Tropic; and although its western half (Europe and the Mediterranean basin) has been incomparably better searched than any other division of the globe, it has not yielded more than about five hundred species.” The Nearctic or North American Region, in strange contrast to the Neotropical, is no richer than the Palearctic one, except in the fact that, while the number of known species in the two regions is about the same, the area of the Nearctic is estimated at less than half that of the Paleearctic Region. Generically, all the forms of the former are represented in the latter region. Oceanic islands are particularly poor in Rhopalocera, whether lying in tropical or temperate latitudes, and in this respect—as, indeed, in regard to their entire fauna and flora—exhibit (as Darwin, and espe- cially Wallace, have shown) a marked contrast to both recent and ancient ‘ continental” islands, viz., those which have at some time been connected with a continent. All the isolated Atlantic islands, and many of the very numerous Pacific ones, are cases in point, the few butterflies they possess being unmistakably, for the most part, chance settlers from other lands—usually the nearest continent—or 1 In his most careful and invaluable Synonymic Catalogue of Diurnal Lepidoptera (1871), and Supplement (1877). 2 Dr. Staudinger’s very thorough Catalog der Lepidopteren des Europeischen Faunen- gebiets (1871) gives 456 species arranged in 44 genera, RHOPALOCERA. 25 their slightly modified descendants. But there is no case of the kind so striking as that of New Zealand, which, though 1200 miles distant from Australia, lies wholly in temperate latitudes (between 33° and 53 S.), is in extreme length 1100 miles, and has an area not much less than that of Great Britain and Ireland, but has not hitherto yielded more than sixteen species, of which, as Mr. A. G. Butler points out,’ six are probably of Australian origin, and one is a recent intro- duction from America. This extraordinary scarcity is the more appa- rent when it is remembered that the British Isles, one of the very poorest countries in Hurope for butterflies, have sixty-three undoubt- edly native species. The total number of Rhopalocera now known to science must be between ten and eleven thousand. Mr. W. F. Kirby’s Synonymie Cata- logue, published in 1871, included about 7700 species, and his Sup- plement of 1877 enumerated nearly 1800 additional forms brought to light during the intervening six years, making together about 9500 species. ‘Taking the five families in the order of their respective numbers, it is found they stand as follows, viz.:—1. Nymphalide, 4040; 2. Lycenidw, 1550; 3. Hesperidw, 1550; 4. Papilionidea, 1400; 5. Hrycinide, 900. The continual discovery of new species is not likely to change this order of numerical relation between the families; but almost certainly the ranks of the smaller members of the Lycenide and Hesperide will be largely augmented, and the great disparity in numbers between those families and the Nymphalide proportionately reduced. When the twelve Sub-Families are placed according to the number of species they respectively contain (the Lycw- nide and Hesperidw are excluded from this series, not being divided into Sub-Families), they stand thus, viz. :— 1, Nymphaline, . ‘ . 1980| 7. Nemeobiine, ; gh fS 2. Satyrine, é ‘ . Io40o| 8. Heliconine, . ‘ . Sigwco 3. Pierinex, : : - goo| 9. Acrein», . ; + REO 4. Danaine, : ; . 680] 10. Eurygonine, . ‘ ; go 5. Evycinine, . : . 650|11. Brassoline . : : 70 6, Papilionine, . . . 510|12. Libytheine, . : ‘ II The Ethiopian Region, of which extra-tropical Southern Africa constitutes a characteristic zoological province or ‘‘ Sub-Region,” has all the families and eight of the twelve sub-families, the four of the latter that are not represented being the Heliconine and Brassoline among the Nymphalidw, and the Hrycinine and Eurygonine among the Hrycinide. South Africa is poorer by one sub-family than the Region, having hitherto yielded no representative of the Memeobune. 4. DIFFERENCES PRESENTED BY THE SEXES. With very few exceptions, the male is smaller than the female, and his wings are comparatively narrower, the fore-wings often being more 1 Trans. Wellington Philos. Soc., 1878, p. 263. 26 SOUTH-AFRICAN BUTTERFLIES. pointed. The abdomen of the male is more slender and compact, and laterally compressed, while the thorax is relatively larger and thicker. The more atrophied condition of the fore-tarsi in the male of three of the five Families has been already treated of; in contrast to those of the female, the fore-tarsi are especially noticeable for their imperfect development in the male Lrycinidw. This sex is also distinguished in many genera by various badges on the wings, consisting of a small sac (Danais), smooth patches of peculiarly arranged scales (Zuplea), streaks of short appresséd hairs along the nervures (Argynnis, some species of Papilio), or tufts of hair (Callidryas, Mycalesis).._ The prehensile or clasping organs at the extremity of the abdomen, although not very apparent externally (except in the Papilioninw, where the outer valves are conspicuous), are of remarkable development and complexity; and in all cases where the sexes are much alike in general appearance they afford with a little pressure a certain means of determining the male.” Many of the Danaine (genera Danais, Euplaa, Amauwris, Lycorea, Ituna) possess, in the same region of the body, a pair of elongate organs provided with a dense terminal fascicle of radiating hairs, which do not appear to be often exserted, and which I have found only in the males. Where there is much difference in colouring, it is almost always the male that is the more brilliant in hue, most of the notable exceptions being cases in which the female has been modified in pro- tective resemblance to some species of another group. In the Danaine, the Heliconine, a large number of the Satyrine and Nymphaline, most Papilionine and some Lycwnide, the sexes are alike, or differ merely in the female being somewhat duller than the male, and the same may be said of most of the Hesperidw. Among the Acrewine, on the con- trary, it is rare to find a species whose sexes are alike. It must be noted, however, that in the cases of widest dissimilarity between the Sexes, it is almost invariably only the upper surface of the wings that exhibits so great a contrast, the under surface presenting very slight, if any, differences.” The manifest reason of this is that, with scarcely an exception, the colouring of the under side (exposed when the butterfly 1 These are regarded as scent-organs by Fritz Miiller and some other observers ; but I have not seen proof af this view adduced, and am disposed, with Mr. Bates, to regard them as “an outgrowth of the male organisation,” without special function. 2 These accessory male organs have been carefully investigated by Dr. F. Buchanan White throughout the European Butterflies, and by Mr. P. H. Gosse in the genus Papilio from all parts of the world. In the allied group of Trichoptera, Mr. R. M‘Lachlan has found in the homologous parts good classificatory characters ; but the astonishing differences which they exhibit in closely-allied species of the genus Papilio (e.g., P. Demoleus of Africa and P. Erithonius of India, or the African P. Nireus and Bromius) render them apparently of little value for systematic arrangement. See Zrans. Linn. Soc., Zool., 2d Series, vol. i. p- 357, and vol. ii. p. 265 (1877 and 1883). 3 This is practically a character of the greatest assistance to the collector and student, enabling him to identify the sexes of a species in numberless instances where, if both surfaces of the wings had greatly differed, it would have been impossible to arrive at any satisfactory conclusion. RHOPALOCERA. ey, is at rest) is more or less protective, from its obscurity or its resem- blance to the tints of the customary surroundings. In two genera of butterflies, viz., Acrwa of the Sub-Family Acrwine, and Parnassius of the Sub-Family Papilionine—which are very remote from each other in almost every respect except their semi-transparent wings—the females exhibit a very remarkable and quite peculiar structure, in the form of a horny pouch or sac, attached to the under side of the abdomen. In Acrea this appendage is on the penultimate segment, and is of moderate size, being best developed in A. Neobule and A. Horta; but in Parnassius it is much larger, and in P. Delius is widely open posteriorly, and occupies the whole under side of the abdomen. ‘The use of this pouch—which is often detached and lost during life—has not been satisfactorily determined. A curious difference between the sexes is presented in several genera of Lyceenide,—such as Humeus, Myrina, Deudoriz, and Capys,—where the palpi of the female are considerably longer than those of the male. The same character is noted by Westwood (in Gen. Diwrn. Lep.) as occurring in three genera of Hrycinida, viz., Alesia, Nymphidiwm, and Aricoris. It occasionally happens that the male and female characters are combined in one and the same individual butterfly, and, where the secondary sexual differences are very marked, the appearance of such an example is very singular. Boisduval (Sp. Gen. Lep., i. p. 27) men- tions eight species of which so-called ‘ hermaphrodite ” individuals had been noticed by authors, and a good many other cases have been re- corded. A recent instance in South Africa is that of a specimen of Lycena Telicanus (Var. pulchra, Murray), taken near Grahamstown by Mr. F. Billinghurst, in which the wings of the right side are of the female pattern and colouring, while the left-hand wings are of those of the male. 5. HAUNTS AND HaBiTs. The dependence of Butterflies on vegetation (especially in their caterpillar state), and their need of shelter from high winds, explain how it is that they chiefly abound in wooded districts. Sunshine, a still atmosphere, and flowers are the surroundings most favourable to the great majority of them: in exposed spots, when the weather is boisterous, nearly all species are helplessly driven before the gale, and they speedily succumb to combined cold and rain. There exists, of | course, a large number of species found in open country, and many are peculiar to such tracts (especially in mountain stations), but forest-clad lands are incomparably richer. Only a few butterflies, however, inhabit the depths of woods, the great gathering of them being on the out- skirts, or where the forest is broken by open spots and the sunshine has access. In South Africa, the richest collecting-ground is the wooded coast of Kaffraria, Natal, and Zululand, and the country about Delagoa Bay seems almost equally productive. 28 SOUTH-AFRICAN BUTTERFLIES, The food of these insects in their perfect state consists mainly of the honey of flowers, and this renders them of great importance to the world of plants; their downy heads and bodies, and in some cases their long trunks, conveying the pollen to the stigma of the flowers which they visit. Hermann Miiller has well indicated (Befruchtung der Blu- men, Engl. transl., 1883, p. 594, &c.) how exactly and reciprocally many flowers and butterflies are thus adapted to serve each others’ purposes, especially in the Alps, whose exceptionally brilliant flora appears to lay itself out, as it were, to attract the Rhopalocera, which are more numerous at considerable altitudes than any other group or diurnal insects. Many other liquid substances, however, prove attrac- tive to butterflies,—water, the juice of fruits, sap of trees and other plants, and even animal excreta, blood, and decomposing matter attract- ing various species." It is not uncommon to find small clusters or groups of various species- drinking at damp sand or mud on the edge of water; and observers on the great tropical rivers never fail to notice the brilliant effect of the larger assemblies of this description there prevalent. The butterflies that affect the stronger drinks above men- tioned are chiefly members of the Sub-Family Vymphalinew, some of which (the genus Charaxes, for instance) appear never to visit flowers ; but several Lycenidw and some of other groups are found indulging in the same liquids, especially at the sap exuding from the wounds in trees. The compound of sugar and beer used by collectors to attract nocturnal moths proves also very seductive to butterflies with the tastes described, and may be used with considerable effect in bringing some of the high and rapid flyers within reach. There are, again, a good many species that appear to take little or no food in their imago state ; such are various Satyrinw and Lycaenidae, and apparently nearly all the Erycinide, of which latter Mr. Bates observes? that very few species frequent flowers, though he mentions that some were noticed imbibing the moisture from damp sand.’ The flight of butterflies varies very greatly in speed, height, and duration. The Danainw, Acrwine, and Satyrinte are nearly all slow flyers, and the latter are erratic and wavering, and seldom rise far above the herbage. The Hrycinide, Lyceenide, and Hesperide—espe- cially the latter—are all characterised by the shortness of their flight, though they show every degree of speed. Most of the Pierine are very active insects, and they exhibit the peculiarity of travelling onward in one direction, instead of fluttering about particular spots. Nearly all 1 Oberthiir has observed (tudes d’ Entomologie, i. p. 17, 1876) that the beautiful Teracolus Charlonia (Donzel) of Northern Africa seemed to be attracted by the sweat of horses; and Mr. H. O. Forbes records (Naturalist’s Wanderings in Eastern Archipelago, p. 138, 1885) that in Sumatra Zuplea Ochsenheimeri settled numerously on the perspiring bodies of the natives and on his own hands; and that another large butterfly, Cynthia Juliana, was also often caught at the bodies of the natives. 2 Journ. Linn. Soe., Zool., ix. p. 369 (1868). 3 Naturalist on the Amazons, 2d edit., p. 331. RHOPALOCERA. 29 the Papilionine have a powerful sustained flight, and some soar to a considerable elevation. For habitual high flight certain groups of Nymphaline, represented by the genera Morpho and Charazes, are most noticeable, those of the latter group being also immensely rapid on the wing. The males are in all butterflies the stronger and more frequent flyers; but this difference is less pronounced in the Nympha- line than in the other divisions. In South America, as Mr. Bates and Mr. Wallace inform us, the males of many Nymphaline and Pierine congregate in sunny open places in the forenoon, while the females remain retired in the forests, to which the males resort in the afternoon. In the South African woods I have noticed that the fine pale-yellow males of Papilio Cenea follow a set course during all the forenoon, sometimes sporting with each other, or stopping on their way to visit flowers, but not diverging far from the circular track they pursue. The females, however, keep near the ground and fly but slowly, often, too, remaining motionless for a long time in some shady spot.' Colonel Bowker and Mr. W. D. Gooch have noticed the same habits in the grand Papilio ophidicephalus. The males of many butterflies are very combative, not only in rivalry with those of their own species, but with members of wholly different families. I have observed this chiefly with members of the Nymphalinw, Lycenide, and Hesperide ; and it has often amused me to see a pugnacious little “ Copper” or ‘¢ Skipper ” take up his station on some tall flower, and persistently drive off all other visitors. Having no offensive weapons, butterflies’ encounters do not lead to more serious results than the impairing of their beauty to a small extent; but they sometimes show much pertinacity in their conflicts. Captain Harford sent me, through Colonel Bowker, in 1879, two males (differently coloured) of Acrwa Encedon, which he had observed struggling together on the ground for a long time; and Mrs. Barber informs me that even the females of Acrwa Horta contest with much fury the possession of a leaf on which to deposit their eggs. From certain observations of Colonel Bowker in 1882 at D’Urban, Natal, on the Diadema Misippus, it appears that this determined defence by the male of a particular station is in some cases due to the fact of there being in the immediate vicinity the chrysalis of a female just about to disclose the perfect insect; and this is confirmed by Mr. W. H. Edwards’ notes on Heliconia Charitonia in the Southern United States, and the Rev. W. D. Cowan’s on Papilio Demoleus in Mada- gascar” The carriage of the wings when at rest varies a good deal among butterflies, and is not always the same during a mere temporary sus- pension of activity and during prolonged repose. The erect position of all four wings is the most general, and prevails among the Nym- 1 Mr. J. P. Mansel Weale notes (Trans. Ent. Soc. Lond., 1873, p. 132) that in the later afternoon the females show themselves more, and are then hotly pursued by the rival males. 2 See Proc. Ent. Soc. Lond., 1882, p. iv. 30 SOUTH-AFRICAN BUTTERFLIES. phalide, Lycenide, Pierine, and many Hrycinide ; but most of these, when temporarily settled, open and shut the wings, or keep them a little apart. The Papilionine usually settle with wings erect, but are fond of resting with the wings expanded, in such a way that the hind- wings are more or less covered by the fore-wings ; and they have further the peculiar habit, when visiting flowers, of keeping the wings in rapid vibration. The Zycewnide universally, when settled temporarily, pro- ceed to move the erect or half-erect hind-wings alternately up and down.’