168 ERNEST A. BACK. 



abdomen is uniformly brownish-black. The hind femora and 

 tibise seem some longer ; all the tibiae bear black bristles, except 

 at tip, and the hind tarsi are black. The front and middle 

 tarsi and the third antennal segment are gone. The wings 

 are darkened only on the basal half, the outer half is pure 

 hyaline; as in the type, the second posterior cell is consider- 

 ably longer than the third, and the fourth with a long peduncle. 

 More material may prove this a new species. 



Leptogaster ochraceus. 



Leptogaster ochraceus Schiner, Verh. Zool.-Bot. Ges., XVII, 

 359; 1867. 

 Length about 12 mm. — -Translation. — Entirely light ochre- yellow; 

 the dorsum with a light brownish bloom, dull, with traces of four 

 duller longitudinal stripes; pleurae shining white pruinose. Abdomen 

 somewhat glistening, the first segment in the middle with a brown 

 spot, the following notched (ein chositten) with brown. Lower part 

 of face shining white; mystax white, outstanding; proboscis brown, 

 at base lighter. Antennae yellow; the third segment brown, short 

 elliptical, moderately pointed distally; the bristles short and thick. 

 Legs yellow, the femora at base nearly white, on the metatarsi in 

 particular noticeably so, the metatarsi being short. Claws black, em- 

 podia half as long as the claws. Wings tinged with yellow, veins 

 yellow; the cubital cell (second submarginal) very long, more than 

 twice as long as its peduncle, the anterior branch of the third longitud- 

 inal vein, closing the cell before, curved upward (bauchig erhoben); 

 the second posterior cell longer than the third posterior, its peduncle 

 shorter than that of the second submarginal; the fourth posterior cell 

 with a very short peduncle. 



Type. — Collection of Winthem. Two specimens without 

 sex designated. 



Habitat. — Penn. (type). 



As far as I know this species has not been recognized by 

 American students. I have sometimes thought that testaceus 

 and ochraceus must be closely related. 



Leptogaster pictipes. 



Leptogaster pictipes Loew, Cent., II, 7, 18(>2. 

 Leptogaster varipes Loew, Cent., II, 81, 862. 



Leptogaster varipes Townsend, Annals and Mag. Xat. Hist., XX, 

 23. 

 $ 9 -—Length 5-7 mm. — Polished black; face whitish pruinose, 

 thorax everywhere thinly white pruinose except the dorsum, which is 



