Article beginning on page 373.
Psyche 5:373-378, 1888.

Full text (searchable PDF)
Durable link: http://psyche.entclub.org/5/5-373.html

The following unprocessed text is extracted from the PDF file, and is likely to be both incomplete and full of errors. Please consult the PDF file for the complete article.

inflated; colors similar but the trans-
versal yellow bands larger and on the
3d and 4th segments extended into a
median dorsal line ; last segment short, black, shining, with a flat basal impres- sion; appendages as long as the seg-
ment, converging, cylindrical, rounded
on tip, black, hairy; part between them
large, black rounded. Vulvas lamina
large, broad, a little shorter than the
segment, split to the basal third, point- ed, tapering gradually to the tip, yel-
low ; cavity bordered by it black, with
an elevated ridge, pointed in middle.
Length
Abdomen
Ala sup.
Ala inf.
Pterostigma
Femur post.
Appendages
Male
34
24
22*
22
2
5
12
Female
33
20-23
23
21^-224
-
5
I
DESCRIPTIONS OF SOME
Male Fern ale
Exp. ala
47 48
Lat. cap.
6 5i
Breadth ant. 6
' post. 7
HABITAT : Center, N. Y.. Mr. J. A.
Lintner, no. 2839, 27 May, 4,^ ; 2840,
21 May, 4 9 . Two females (L. voc-
ua Hagen, no descr.) from Saskatche-
wan, Lake Winnipeg, collected in 1860
by Robert Kennicott. The position of
this rather eccentric, small species is
near C. ulheri, but it is separated from that species by unusual characters.
The and angles of the hind wings of the
male are nearly rounded; all triangles
are without transversal veins ; only one series of discoidal cells, and a very plain venation. It is very interesting that this apparently arctic species is found in east- ern New York.
NEW NORTH AMERICAN
DOLICHOPODIDAE.
BY WILLIAM M. WHEELER, MILWAUKEE, WIS.
(Concluded from 9.362.)
PELOROPEODES, n. gen.
f. Small dull metallicgreen species.
Palpi
prominent, though not enlarged. Antennae as long as the head and thorax; first joint stout, subcylindrical, glabrous on its upper surface, with a few hairs on its under side; second joint short, rounded, subcalyculate; third joint pubescent, very long, tapering from a broad rounded base to a blunt point, on which is inserted the thick, flexible arista. Face rather broad for a male, front ample. Thoracic dorsum moderately arched, beset with the usual stout setae; scutellun~ 'broad, short, smooth, with four setae. Abdomen
with six segments, short, stout at the base but tapering very rapidly to the apex, where is attached the sessile and greatly enlarged hypopygium, consisting of a scuttle shaped box. two thirds the size of the abdomen, from the ventrad directed opening of which protude several hook-frhaped chitinous ap- pendages. Legs rather stout. hairy; tibiae equalling the femora in length ; spurs of the fore tibiae short, those of the posterior pairs



================================================================================

of medium size; tarsi of all the feet some- what longer than the tibiae; hind metatarsal joint without bristles. Wing somewhat long- er than the body, slightly pointed; anal angle obtuse; fourth longitudinal vein slightly bent, entering the tip of the wing and
scarcely inclined towards the end of the third longitudinal vein ; second and third longi- tudinal veins straight, parallel; fifth longi- tudinal vein evenly curved. entering the pos- . terior margin somewhat nearer the base than the apex of the wing; posterior cross vein perpendicular to the hind margin, dis- tant about twice its length from the tip of the fifth longitudinal vein; sixth longitndi- nal vein short. distinct.
$? of the same color as the male. Face
rather broad, not attaining to the lower mar- gin of the eyes. Antennae differing pro- foundly from those of the male ; especially in respect of the third joint and its arista; the former being very short, semioval and flat- tened laterally, while the latter, inserted dorsally, and clothed with tnicroscopic pu- bescence, is so long that if reflexed it would reach to the middle of the thoracic dorsum. Front ample; ocelli pron~inent. The rather large ovipositor, much exserted in all of my specimens, terminates in a comb-like organ with regular, short, blunt teeth.
(Generic name derived from dAwpos, enor- mous, and m<oSqs, provided with a large
penis.)
PELOROPEODES SALAX, n. Sp. 8. 9.
Length : $ 2.25 mm. ; $? 2 mm. ; length of wing 8 2.5 mm., $ 2.25 mm.
Dull metallic green. Palpi black. Face
and front metallic green, almost obscured by whitish dust. Antennae black ; pubescence of the elongated third joint of the male, whitish ; bristles of the superior orbit black, those of the interior orbit white. Thoracic dorsum dark metallic green, but so thickly covered with yellow dust, as to be subopaque in the male, opaque in the female; this dust is thickest on the anterior half of the thorac- ic dorsum ; scutellum dusted with white with a metallic violet reflection ; pleurae opaque, rather thickly covered with white dust. Cil- in. of the tegulae long, yellow. Metallic green ground color of the abdomen some-
what concealed by whitish dust; all the seg- ments covered with sparse short black hairs; capsule of the hypopgium black, sub-
opaque, with short appressed whitish pubes- cence on its lateral faces and a few short, ir- regularly placed setae in the median dorsal line; the numerous hook-like appendages
pale yellow; ovipositor of the female yellow- ish red; teeth of its comb-shaped tip black. Fore coxae entirely yellow, beset towards their apices anteriorly with a few stout black hairs: posterior coxae with infuscated bases. Legs pale yellow, covered with rather stout black hairs, arranged in very regular rows on the tibiae ; the posterior pairs have three spines on their posterior faces. Tarsi black- ened from the tip of the first joint. Haltei-es vellow. Wings uniform grayish h~alire,
somewhat pointed; base lanceolate; the por- tion of the fourth longitudinal vein beyond the posterior cross vein but very slightly bent, its end running parallel with that of the third longitudinal vein.
HABITAT : Milwaukee Co., VVis.
I have taken two males and three fe-
males of this species in a damp and
rather dense wood where the under-
growth consisted very largely of Boeh-
meria cylindrical, and Impatiens f dva.
A number of females of this species
captured on the foliage in damp woods
near Milwaukee, agree with Loew's de-
scription except in the color of the an- tennae. According to Loew the anten-
nae are " entirely black," whereas in all my specimens the two basul joints are
honey yellow, while the third joint is




================================================================================

fuscous. The tergum of the last abdom-
inal segment is also more blackish than
metallic green. These differences are
probably to be attributed to local varia- tion. I subjoin a description of the
male, which seems to have been un-
known to Loew and which differs from
the female in much the same manner as
the male of the European Cfirysotimus
moZZicuZus, Fallen, differs from its fe- male.
Length : 1.5-1.75 mm. ; length of wing 2.5 mm.
Bright golden green. Palpi blackish. An- tennae with their two basal joints honey yellow; third joint fuscous, covered with dis- tinct pale hairs. Cilia of the inferior orbit white; hairs and setae covering all other portions of the body honey yellow. The
vivid metallic green of the thoracic dorsu~n and pleurae dimmed somewhat by a layer of whitish dust. Abdomen bright metallic
green (venter yellowish?) of a shade differ- ing from that of the thorax in being some- what less golden and less subdued ; hypopy- gium large and conspicuous; its outer por- tions brown, its inner appendages yellow. Legs honey yellow, the last tarsal joint on all the feet fuscous or black. Halteres yel- low. Wings grayish hyaline. suffused with yellow, especially at their bases; veins honey yellow.
The six males before me were taken
in company with the females of Loew's
C. pusio; hence I believe there can be
110 doubt about their identity, especially since the relation that the sexes bear to each other is the same as that observed
in the case of C. molliculus. My spec-
imens have collapsed in drying so that
.I am unable to decide whether the ven-
ter is yellow, as in the European spec-
ies.
APHANTOTIMUS, n. gen.
3. 2. Minute metallic green species, with rather thin integument, collapsing when
dry; setae covering the body yellow; sexes alike in coloring. Palpi of moderate size. Antennae alike in both sexes; first joint short, smooth : second short and broader, provided with the usual hairs; third joint small, narrower than the second, spheroidal, with rather long, apically inserted and mi- croscopically pubescent arista. Face rather broad in both sexes, narrowed below, not reaching to the lower corners of the eye&. Head situated rather deep on the thorax to which it seems to beclosely applied. Thorax resembling in its shape the thorax of Chryso- tinws; in the prescutellar region there is an ex- tensive though shallow indentation, the exact shape of which my dried and collapsed speci- mens do not enable me to determine. Abdo- men laterally compressed, in the male of six segnrents~tapering2Iy ; hypopygiu m very large. pedunculate, distinctly flexed under the venter, capsule hood-shaped, with exserted appendages; a pair of these, apparently
homologous with the lamellae of the hypo- pygium of DoZichoj4tts and Gynino-pternns, are disk-shaped and fringed with cilia ; ovi- positor large, usually exserted, resembling that of Ckrysottmus. Legs rather smooth, with short and appressed spines ; tibia1 spurs feebly developed; in the spinulsition of the legs little or no sexual differences.
Wings
thin, hyaline, rather large; costa rather prominently arcuate ; anal angle not very prominently projecting. Neuration resem- bling that of Chrysotimus; posterior cross vein more than twice its length distant from the border of the wing; fourth longitudinal vein gently bent beyond the posterior cross vein, and ending at or a little in front of the tip of the wing. With this vein the third longitudinal vein runs parallel and is in one species nearer to it than to the second longi- tudinal vein; second and third longitudinal veins presenting the same gentle curvature as the fourth.




================================================================================

(Generic name drived from d+avros,
forgotten, and TLIJI,~, honor.)
The species of Apkantotlmus resem-
ble the chrysotimi in having yellow
hairs and setae ; in the prescutellar in- dentation, in the neuration of the wings and in the apical insertion of the anten- nal arista.
The females, however, re-
semble the males in coloring, and do
not have the abdomen largely yellow.
The hypopygium of Aphantotimus is
disengaged and very large, thus resein-
bling that of the higher genera Eke
DoZicho@s and Gynzno$ternus ; while
the hypopygium in Chrysotz'mus is
small and partly embedded. There are
also differences in the size and shape of the third antenna1 joint; though this
character is not of generic value.
The two minute species here de-
scribed, differ considerably in the struct- ure of the hypopygiuim, but to just what extent I have'not ascertained, as this or- gan must be examined in recently killed
specimens. Their close resemblance in
other respects, e. g. in the structure of the antennae, neuration of the wings,
shape of tlie body and covering of yel-
low hairs, leads me to unite them in the same genus.
APHANTOTIMUS WILLISTONI, n. Sp. 3. 9.
Length 1.5-1.75 mm. ; length of wing 1.5 mm.
Palpi pale yellow.
Face metallic green,
smooth ; covered with a thin layer of yellow- ish dust, composed of minute scales that are clearly discernible, and not closely aggre- gated. Antennae entirely black, inclining to piceous or brown when viewed from their
apices; third joint somewhat conical at the insertion of the arista and covered with scarsely perceptible pubescence. Front rath- er broad, blackish green, covered with the same dust as the face; frontal setae and those of the thorax and abdomen pale yellow; cilia of the inferior orbit yellow. Thoracic dor- sum and scutellum golden green, overlaid with yellow dust, consisting of minute
scales; pleurae bright golden green, less dim than the thoracic dorsum, growing
black in the region of the tegulae. Cilia of the tegulae yellow. Abdomen bright rnetal- lie green, with a more violet than golden re- flection; covered with short and stiff yellow hairs ; in the female the exserted ovipositer is orange yellow; in the male the large hood- shaped hypopygial capsule is shining black, changing to metallic green in some lights; appendages pale yellow; the two lamellae rounded, fringed with yellow cilia; a long and exposed blade-shaped organ (the penis?) extends from the base to the tip of the hypo- pygium on the ventral side. Legs pale yel- low ; tips of the tarsi scarcely darker, covered with short brown hairs, which turn to yellow in some lights. In the male the fore coxae are fuscous anteriorly and basally; the pos- terior coxae are fuscous with yellow tips ; in the female the coxae are largely pale yellow, .
there being only a large fuscous spot at their bases. Halteres large, yellowish white.
Wings brownish hyaline with brownish
veins; the third and fourth longitudinal veins parallel, and more approximated to each other than the third longitudinal vein is to the second.
HABITAT : Milwaukee Co., Wis.
The single male and three females in
my collection were taken on the foliage
in a swampy wood in company with
hundreds of Dolichopods belonging to
the genera Dolicho$us, Pelasfoneurus,
Sympycms, Psilow and Chysotus.
Length 1-1.5
mm.
FRATERCULUS, n. sp. 3. 2.
mm.; length of wing 1.25




================================================================================

Palpi brown, with white hairs. Face, dark-colored legs and the rieuration of front and occiput metallic green, covered the wino-s, TIlree males and one fe- with yellowish dust, the separate scales com- posing which are distinctly discernible as in the preceding species. Antennae black,
resembling in structure those of A. willis- tom'. Cilia of the inferior orbit yellow. Thoracic dorsum bright metallic green with bluish reflection; the thin covering of dust and the comparatively few setae yellow;
prescutellar depression very distinct, some- what v-shaped ; pleurae vivid metallic green, covered with a thin layer of yellow dust, .
Tegulae pale yellow, cilia yellow, changing to brown in some lights. Scutellum and abdomen vivid metallic green with violet and cupreous reflections, the rather long hairs on the latter pale yellow; venter and hypopygium black, the latter roughened, metallic green dorsal- ly; appendages pale yellow. The capsule of the hypopygium is narrower and somewhat
longer than in the preceding species; the long, blade-shaped appendage dark brown; the two lamellae dirty yellow with black tips, apparently without cilia on their edges. In the male, come and legs black, the former with yellow, the latter with black hairs. Femora with a faint metallic green luster; knees broadly yellow; trochanters, inner faces of the tibiae and bases of the separate tarsal joints dirty yellow. In the female the femora and tibiae are bright metallic green, the knees and trochanters yellow, the tarsi black. Halteres pale yellow. Wings faintly brownish hyaline; third and fourth longi- tudinal veins less approximated than in the preceding species ; perfectly parallel and but very slightly curved from the posterior cross vein on. The fourth longitudinal vein tenni- nates in the tip of the wing.
HABITAT : Milwaukee Co., Wis.
This species is very readily distin-
guished from A. å´wilZiston by its smal- ler size, the more bluish and less golden reflection of its metallic surfaces, its 0
male were taken with the preceding
species.
XANTIIOCHLORUS HELVINUS, LOEW. 8.
Loew felt some doubt as to whether
this species, which he described from
female specimens only, was not merely
a variety of the Europeiin X. tenellus.
An examination of a number of males
taken by me in several localities in the vicinity of Milwaukee, seems in no way
to invalidate the species. In these spec- imens I can detect no green markings
whatsoever. The general honey yellow
color of the body is departed from only
on the cheeks and front, which are has
gray and on the pleurae, where 1 find
two clearly defined black spots ; one
larger and more pronounced just back
of the tegula and another smaller and
more oval spot (not mentioned in
~oew's description) on the metathorax
just beneath the lateral edge of the scu- tellurn. The powerful bristles on the
head and thoracic dorsum, as well as
the cilia of the tegulae and the hairs
covering the other portions of the body
are dark brown, almost black' thus con-
trasting with the yellow body color.
The hypopygium is prominent, though
hardly dick angeschwollen " as is the
case in the European x. teneZZus,
Wied, according to Schiner. The
acute hypopygial appendages scarcely
project and are honey yellow. The
bases of the second, third and fourth
abdominal segments are infuscated in
dried specimens.




================================================================================

HYDROPHORUS PHILOMBRIUS, n. Sp. 3.
Length 3.5 mm. ; length of wing 4 mm.
Dull olive green.
Face bright metallic
green, covered with white dust, which scarce- ly dims the brilliant ground color, except on the oral margin, where it is aggregated to form two spots, one on each side abutting on the orbit. Cheeks and palpi black, clothed with short appressed yellow pubescence ; the pubescence on the eyes short and silvery white. Antennae black, pubescence on the third joint white, tip of the robust arista pale. Front and occiput of a blackish ground col- or, covered with glistening white dust which gives them a frosted appearance ; cilia of the superior orbit black; those of the inferior or- bit glistening white, but becoming tawny near the oral orifice. Thorax, scutellum and abdomen covered with the same frost-like dust as the front; as this dust, which con- sists of microscopic scales, is wanting about the insertion of each seta, the surface has a spotted appearance. The disk of the thoracic