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ZOOLOGICA

SCIENTIFIC CONTRIBUTIONS OF THE
NEW YORK ZOOLOGICAL SOCIETY

FROM THE TROPICAL RESEARCH
STATION IN BRITISH GUIANA

VOLUME III. NUMBER 11

(Tropical Research Station Contribution Number 105)

A NEW ENTOMOBRYA

By J. W. FoLsom

EM bil Saher BY TD Ar SOCIETY
PM AOOMOGICAL PARK NEW YORK

DECEMBER 24, 1921

7” er ons Pes
az ee as a cs £s ;

Volume III, Number 11

A NEW ENTOMOBRYA
By J. W. FoLsom

Entomobrya wheeleri sp. noy.
(Fig. 18)

Head and body mottled with blue pigment, with no definite
color pattern (Fig. 18a). Sternum white. Antenne blue; first
three segments darker apically. Coxe slightly pigmented, also
femora distally and tibiotarsi proximally. Furcula unpig-
mented. Eyes 8-8, on black patches, the two inner proxima!
eyes of each side being smaller than the others. Antennz one
and three-fifths times as long as the head, with segments in
relative lengths about as 9:22:19:30; basal ring large, resem-
bling a segment. Mesonotum not projecting anteriorly. Fourth
abdominal segment almost five times as long-as the third.
Unguis (Fig. 18) with a pair of lateral teeth and with two
inner teeth, the proximal tooth being doubled. Unguiculus
three-fifths as long as the unguis. Furcula attaining the ventral
tube. Manubrium and dentes subequal in length. Dentes
crenulate dorsally. Mucrones (Fig. 18c) subequally bidentate,
the basal spine being absent; two fringed sete projecting from
each dens extend almost to the end of each mucro. Corpus of
tenaculum with a single curving ventral seta. General clothing
of dense short sete. Clavate, ringed sete occur on the anterior
part of the head, on the last abdominal segment, and on the dor-
sal region of the manubrium. Pointed, fringed sete are present
on the last two abdominal segments and on the furcula dorsally
and ventrally. A few long, stout, fringed sete occur on the
antenne, two or three on each coxa, a few on femur and
tibiotarsus, and several on the anterior surface of the ventral
tube. Length 1 mm.

The preceding description applies only to the largest speci-
men as regards proportions and pigmentation, for these
characters vary according to the age of the individual, as usuai.
Thus in a specimen 0.39 mm. in length, there is scarcely any
blue pigment, the fourth antennal segment being, however,

4
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mJ

238 Zoologica: N. Y. Zoological Society UNE alae

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4
|

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al ae |
IG. 18. ENTOMOBRYA WHEELERI SP. NOV. nl |
a, lateral view, X 41.5; b, left hind foot, X 386; ¢c, left mucro, X 386. et) fh

faintly tinged apically with blue; the eyes are pigmented sepa-
rately instead of collectively; the antennz are subequal to the
head in length, with segments short and stout, in relative lengths

as 4:5:5:11; while the fourth abdominal segment is only two ai
and two-thirds times as long as the third. In an individual 0.6 Ni |
mm. in length, the ratio between the third and fourth abdominal €
segments is as 1:4. ais.

Described from four cotypes, which have been deposited
in the Museum of Comparative Zoology, Cambridge, Mass.

I take pleasure in naming this new collembolan after
Professor W. M. Wheeler, who found it living with colonies id
of a peculiar social beetle, Coccidotrophus socialis Schwarz and 4
Barber, at Kartabo, in British Guiana. i]

7
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mets ae ss bom

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A ae

QL Wheeler, William Morton.
591 Study of some social
B74W48 beetles in British Guiana,

Ent. 1921.