THE GENUS TACHINOMYIA — WEBBER 299 



red; first, second, and base of third antennal sef^ment brown or 

 reddish brown. Anal forceps long; each half, viewed in profile, 

 straight on posterior edge for two-thirds its length, hence strongly 

 forwardly curved; viewed from behind, slender and moderately 

 pilose; four dorsocentrals ; no posterior preintraalar bristles; thorax 

 black, gray pollinose with brownish tinge; front silveiy gray polli- 

 nose with definite yellowish cast, at narrowest part about one-fourth 

 the head width; parafacialia concolorous with front, at narrowest 

 part compared with distance between vibrissae 10:19.6 (average 

 of six) ; cheeks nearly one-third the eye height; facial ridges strongly 

 bristly over halfway to antennae; third segment of antenna less than 

 three times the second. Length, 14 mm. 



Female. — Unknown. 



Typc.—Mix\^, U. S. N. M. No. 53387. 



Remarks. — The holotype is from Melrose Highlands, Mass., col- 

 lected by the writer on May 24, 1932. The two paratypes are both 

 males from the same locality as the type collected on May 21, 1932. 

 Other material, in the Melrose Highlands laboratory collection, con- 

 sists of 25 collected specimens from about the same locality as the type. 

 Twenty-one of these have four dorsocentral bristles, one has three, 

 and the remaining three have three on one side and four on the other; 

 lobes of the fifth sternite smooth in five specimens and inconspicuously 

 ridged in the rest ; fourth sternite convexly produced ; first two seg- 

 ments of antenna, and usually the base of the third, brown or reddish 

 brown ; second genital segment orange-red, posterior border of fourth 

 abdominal segment orange-red in all but two specimens, in which it 

 is mostly black ; scutellum black, thinly gray pollinose, broadly reddish 

 at apex. Length variable, 11-16 mm. Besides the above there are 

 three specimens of this species in the David G. Hall collection from 

 Kansas and Arkansas. 



TACHINOMYIA ACOSTA, new species 



Figure 17, f 



In acosta the anal forceps are slenderer than in variata. The species 

 also differs in having the first and second genital segments as well as 

 the fifth sternite black and in characters of lesser importance. 



MaU. — Hind tibiae inwardly with short villosity, the villi scarcely 

 the tibial width in length; lobes of fifth sternite black and without 

 basal flange, their inner edges smooth or at most with low, inconspic- 

 uous ridges; fourth sternite black, convexly produced; fourth abdom- 

 inal segment not densely gray pollinose but at most moderately gray 

 pollinose with black apical border; scutellum black, faintly reddish 

 apically; first and second genital segments black, the latter faintly 



