AMERICAN DIPTERA. I75 



slender, divaricate, about one-half the length of the segment 

 Proboscis short. Thorax moderately convex above with 

 bristles on the posterior part. Scutellum with a row of thin 

 bristles on its margin. Abdomen elongate, its sides nearly 

 paralle ; moderately flattened, bare. Legs moderately stout 

 he first two segments of all the tarsi a little incrassate. Winds' 

 long, narrow toward the base; auxiliary cell narrow, the anal 

 angle wholly wanting as are also the aluke; discal cell long 

 and narrow, the penultimate section of the fourth vein a little 

 shorter than the ultimate section; the third vein from the 

 discal cell, separating the third and fourth posterior cells 

 wholly wanting." 



Type. — Townsendia minuta Williston. 



This genus is remarkable for the size of its typical species 

 The very broad front, receding face and the narrowness of 

 the wmgs at the base are considered by its founder the most 

 essential characters. The confluence of the third and fourth 

 posterior cells makes the separation of the species easy 



Named in honor of Prof. C. H.TTownsend. 

 Towu.soiulia niger n. sp. 



ishe 9 d~btu7hf Tl 4 - 5 ; >W '- Bod y who % black, the abdomen pol- 

 ished blue-black; legs dark yellowish-red; wings brownish hyaline 

 ent ire ly covered with microscopic pubes and beautifully violence*- 



^z:azt^: nd fourth posterior ceiis ^ 



Face narrow, with parallel sides, somewhat receding, without gib- 

 ^S 7 ViSib / e in ^ Whitish P--se; mysL thin, white, 

 short nr h °; al mai " gm WhiGh 1S SOme little distance above the 



ZZ P T° SC1S - ° nt greatly Widened above - as described in the 



TeZmiT^T' : h u iSi \ PrUin ° Se ° n thG SideS ' m ° re b — * on 

 the middle, ocellar tubercle but little elevated and bearing several 



o r w S: st s ' the n1 a ? r ii or r llus red - ocdput «»*-«*& £S 



ose with sparse black -bristles above. Antenna distinctly separated 

 at base, situated a little above the middle of the head black basal 

 segments subequal in length, with black bristles above and below The 

 second segment being much more robust and nearly as broad as long- 

 the third segment longer than the basal segments taken together, gral' 

 ually tapering from base, with a fine whitish pubescence; style distinct 



otriTT-;^ ^ ^ ^^ ^ ^ tWrd Segment ' P^escent and 

 bearing at its tip a short bristle. Thorax well arched; the dorsum 



subpohshed, only faintly obscured by a dull bloom which, on the 



TRANS. AM. ENT . sec. XXXV. MAy> ^ 



