NORTH AMKKICAN DIPTERA. 
353 
sliorter bristles below. Legs black, femora and coxfe more or less silvery ; femora 
and tibife clothed with hlack hairs and stout bristles, some macrochfetfe on the 
middle tibia* ; coxie with posteriorly dilated bristles on anterior surface ; claws 
and pulvilli rather short. Wings grayish hyaline, very slightly fulvous at hase, 
veins mostly flavous; tegulte nearly white, borders almost concolorous; halteres 
fu.scous. 
'J, . — Differs as follows; Front and face narrower, about three-sevenths the 
width of head; cheeks about one-fourth bight of eyes; form narrower; abdo- 
men narrowed, nearly conical ; claws and pulvilli about same length ; orbital 
bristles same. Length 8 mm., or slightly more; of wing 5.5 — 6 mm. 
Described from one Z and one 9 ; Las Cruces, New Mexico. 
The 9 taken June lOtli on flowers of Aster spinosus; the Z taken 
July 10th. This form seems at first to approach Plagia americana 
V. d. Wulp, but it is very distinct in the short and geniculate arista, 
and the long stum}) at bend of fourth vein. 
Genus Tachinodes Br. and Bgst., Zweifl. kais. Mus. W. iv, 133. 
This genus, so far as I can ascertain from comparison, of the descrip- 
tions, is the same as N^einochoeta v. d. Wulp. Mr. van der Wulp’s 
genus has priority, as it was described in 1888 (Biol. C.-A. Di})t. ii, 
38). The above authors give no figure of their genus Tachinodes, 
which was erected for Tachina hystrix Fab. from Brazil. 
Tacliiiia spiiiosiila n. sp. 9 (’)• — Blackish cinereous. Head a little 
wider than thorax, which is about same width as abdomen. Eyes brown, bare ; 
front considerably more than one-third the width of head, golden or brassy- 
cinereous on the sides, somewhat prominent before; frontal vitta blackish, with 
a golden shade in some lights, hardly one-third the width of front, except be- 
hind, where it widens and splits on each side of the ocelli; frontal bristles de- 
scending about half-way down the sides of face, sparse, some fine hairs outside 
them ; a pair of bristles at each vertical angle, the inner stout one directed 
strongly backward, the outer one directed outward ; next frontal bristle short, 
directed outward and backward ; next one long, directed backward ; rest directed 
inward, hardly decussate to base of antennie ; two orbital bristles; face silvery, 
facial depression rather wide below, facial ridges bare, except a few bri.stles above 
vibrissse; sides of face not wide, bare, except for descending frontal I'ow of bris- 
tles ; vibrissfe decussate, inserted near oral margin ; cheeks invaded by occipital 
area, moderately wide, black hairy under eyes, silvery, with bristles on lower 
border; anteniife blackish, shorter than face: first joint short, second elongate, 
more or less silvery, bristly above ; third joint about one and one-half times as 
long as second, only moderately wide, truncate, posterior apical corner rounded ; 
arista black, thickened almost half its length, microscopically short pubescent, 
indistinctly 3 (?)-jointed, second joint not elongate; proboscis about as lung as 
bight of head, brownish or blackish, considerably thickened, labella well de- 
veloped ; palpi orange-yellow, darker at base, slender, hardly thickened on distal 
two-thirds, with some long black hairs on underside; occiput cinereous, thickly 
gray hairy, with a fringe of black hairs on orbital margins. Thorax and scntel- 
lum hairy and bristly, cinereous, with four narrow dark vitta;; scutellum with 
TR.4.NS. AM. ENT. SOC. XVIII. 
(45) 
NOVEMBER, 1891. 
