AMERICAN DIPTERA. 175 



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 

 parallel; moderately flattened, bare. Legs moderately stout; 

 the first two segments of all the tarsi a little incrassate. Wings 

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

 angle wholly wanting as are also the alulae; 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. — Townsejidia minuta Williston. 



This genus is remarkable for the size of its typical species. 

 The very broad front, receding face and the narrowness of 

 the wings 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. S. Townsend. 



Townseiidia uij^er n. sp. 



9. — Length about 4.5 mm. — Body wholly black, the abdomen pol- 

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

 entirely covered with microscopic pubes and beautifully violescent; 

 the vein separating the third and fourth posterior cells wholly wanting; 

 anal cell closed and petiolate. 



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

 bosity, and not visible in profile, whitish pruinose; mystax thin, white, 

 confined to the oral margin which is some little distance above the 

 short proboscis. Front greatly widened above, as described in the 

 generic description, whitish pruinose on the sides, more brownish on 

 the middle; ocellar tubercle but little elevated and bearing several 

 black bristles, the anterior ocellus red. Occiput grayish-white pruin- 

 ose, with sparse black bristles above. Antennae 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, grad- 

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

 rather stout, about half as long as the third segment, pubescent, and 

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

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



TRANS. AM. ENT. SOC, XXXV. MAY, 1909. 



