snow: DESCRIPTUINS ok north AMERICAN TRVPEril)^. 171 



the brown spots of the abdomen more distinct. In two of the eastern 

 specimens, which are not well preserved, the spots are obsolete. 

 The ovipositor of the western female is broader and more depressed 

 at tip than in the other case. 



While differing from its congeners in the four-bristled scutellum, 

 this species has in common with them, a broad front, great breadth 

 and convexity of body, short conical ovipositor, and broad, obtusely 

 tipped, reticulate wings. Its generic location is therefore easily 

 ascertained. 



While the wing of reticulata resembles that of latifrons, it is more 

 guttate and lacks the large dark "convexity " or callosity in the first 

 posterior cell. 



Icterica seriata Loew. 



Two specimens, male and female, Nebraska (Williston ). 



Loew's description being based upon the male, it may be added 

 that the ovipositor is flat, a little longer than the last two abdominal 

 segments, black at tip. 



Euaresta sequalis Loew. (PI. VII, f. 10.) 



Trypeta {Euaresta?^ sp. O. Sacken (Western Dipt., 345). 



Trypcta cequalis Marlat (Ins. Life, III, 312, f. 27, 28). 



There can be little doubt that Loew erred in the characterization 

 of this species when he called the third vein devoid of bristles. 

 Specimens before me from Pennsylvania, Virginia, Illinois and New 

 Mexico, all show distinct bristles on their third vein; otherwise they 

 agree closely with Loew's description. The picture of the wing is 

 essentially the same in all. The black stripes of the anterior femora 

 which Osten Sacken observed in his Colorado specimens (1. c. ) are 

 evident in these specimens, except in the case of two females from 

 Nebraska and Virginia respectively. 



It may be added to Loew's description that the anterior femora of 

 the male are much thickened. The ovipositor is reddish-brown, 

 narrojv, not at all flattened and about as long as the last four abdom- 

 inal segments taken together. 



Euaresta festiva Loew. (PI. VI, f. 9.) 



Kansas (F. H. Snow, Williston, in August); Virginia (C. J. Bridge,. 

 Aug. 31). 



Euaresta bella Loew. 



Many specimens. Everywhere one of the commonest Trypetids. 



