AMERICAN DIPTERA. 173 



c^ 9- — Length 12-14.5 mm. — ^Testaceus, polished. Face whitish 

 pruinose, mystax flavous; occiput with a golden bloom and pale 

 bristles. Antennae yellow, style slender, black; the third segment 

 linear, — gradually tapering, not less than two times the length of the 

 first two taken together. Dorsum of a somewhat deeper color than 

 the rest of the body, and highly polished; the posterior third, lateral 

 margins, pleurae, coxae and scutellum, yellowish pruinose. Abdomen 

 pale testaceus, verging on the tergum, especially on the distal segments, 

 into a dark brown, sometimes almost black. In one specimen the 

 tergum is darker brown and mottled with black. Legs paler than body; 

 aside from a subapical brown ring, often obsolete, on the hind femora, 

 there are no darker markings; claws black; empodia present. Bristles 

 are of the same color as the body except those on the tarsi which, for 

 the most part, are black. Wings hyaline, tinged with yellow; second 

 submarginal cell longer than twice the peduncle, the first posterior 

 moderately long, the fourth posterior with a short peduncle, the anal 

 cell toward the margin narrowest. 



Type. — M. C. Z. A single female specimen in Loew's coi- 

 tion. There are two other females in Osten Sacken's col- 

 lection. 



Habitat.— N. Y.; Westville and Caldwell, N. J.; Pa.; South- 

 ern Ga. ; Montreal (Chagnon), Canada; ? Yucatan, (Williston). 



This species is easily recognized by its uniform yellowish- 

 red color. Described from four females and one male, includ- 

 ing the type material. 



Dr. Williston, in the Biologia, described, under Leptogaster 

 rubida, a female from Yucatan. He is in doubt whether 

 rubidus of Wiedemann from South America is the same as 

 Loew's testaceus. From the description of this Yucatan 

 specimen, I think it might properly be identified as testaceus. 

 As I have seen and know Loew's testaceus, I prefer to hold to 

 it rather than place it a doubtful synonym under rubidus. 



Leptogaster virgatus. 



Leptogaster virgatus Coquillett, Proc. Ent. Sco. Wash., VI, 177; 



1904. 

 f Gonypes nitidus Macquart, Dipt. Exot., I, 2, 155, 1838. 

 f Leptogaster carolinensis Schiner, Verh. Zool.-Bot. Ges., XVI, 

 696, 1866. 

 c^ 9- — Length 9-13 niyn. — Easily recognized by the three polished 

 stripes on the thoracic dorsum. 



Head black, face, front and occiput white, the mystax and fine hair 



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



