200 DIPTERA OP NORTH AMERICA. [PART III. 



three dark-brown bands; the first extends nearly to the hind 

 border, and joins the side of the middle crossvein ; the second 

 reaches the hind border and incloses the lower crossvein ; it is 

 darkest on the fore border, and there unites with the third, which 

 widens along the fore border and occupies the whole of the tip 

 of the wing ; wing-ribs, veins, and poisers tawny ; veins pitchy 

 in the brown parts of the wings ; lower crossvein nearly straight. 

 Length of the body If — 2 lines ; of the wings 3 — 4 lines. 



North America. 



[This seems to be an Euxesta. — Loew.~\ 



6. Walker, List of Dipt. Ins. IV. 



Page 995. Ortalis? diopsides, Barnston's MSS. Fern. 



Nigra, obscura, capite antico fulvo, palpis antennis pedibusque 

 piceo-ferrugineis, alis subcinereis ad costam fusco bimaculatis. 



Body dull-black, clothed with very short black hairs : head 

 beset with a few black bristles, tawny in front and beneath, where 

 it is covered with white bloom ; sides of the face without bristles ; 

 epistoma slightly prominent ; eyes dark-red ; facets of the fore 

 part a little larger than those elsewhere : sucker and palpi ferru- 

 ginous, partly pitchy ; sucker clothed with tawny hairs ; palpi 

 beset with black bristles; feelers ferruginous, shorter than the 

 face ; third joint pitchy above, nearly round, longer than the 

 second joint; bristle black, bare, slender, much more than twice 

 the length of the third joint; abdomen spindle-shaped, much 

 longer than the chest; last segment flat: legs pitchy, mostly 

 ferruginous beneath, clothed with very short black hairs; claws 

 black : wings slightly gray, with a narrow pitchy band at half 

 the length of the fore border, on which, near the tip, there is a 

 small brown spot ; wing-ribs tawny ; veins black, tawny at the 

 base ; longitudinal veins straight ; lower crossvein straight, 

 slightly oblique, nearly twice its length distant from the middle 

 crossvein ; poisers pale tawny. Length of the body 2 lines; of 

 the wings 2J lines. 



St. Martin's Falls, Albany River, Hudson's Bay. 



[This species seems likewise to belong to the Ulidina, a group 

 which is so abundantly represented in America. — Loew.~\ 



