232 BT'LLETIN 31, UNITED STATES NATIONAL MUSEUM. 



Xylota curvipes. 



Xijloia curvipes hoew, Neue Beitr., ii, 11); Osteu Sackeu, Bull. Biif. Soc. Nat. 



Sci.,iii,70; Cat. Dipt., 252. 

 ? Xylota Hatavica Bigot, Annales Soc. Eat. Fr., 1884, p. iA(\. 



Hahitat. — Ne\A' Hampshire, New York, TMiunescfta, California.! 

 (3,9. Leiigtli, 15 to IG™'". Ileatl black with a ^reeuisli reiiectiou; the 

 sides of the iVont and face with white i)ollen. Antennie brownish red, 

 the arista brown. Thorax above of a shiuing black color, with very in- 

 distinct stripes and sj)arse yellow and black pile; a faint ])olli nose spot 

 on the inner side of tbe huuteri ; plenrai black, with yellow and black 

 pile. Abdomen elongated, shining bine-black. Legs reddish yellow 

 (not including the coxre, except a reddish spot on the hind trochanters 

 behind), the hind femora on the distal fourth, tbe hind tibine and tarsi 

 wholly, black ; hind femora much swollen and their tibiie much curved 

 and terminating in an obtuse spur; pile of the femora long and yellow 

 and on the inner side of the hind tibiee thick and black; in the female 

 the pile of the legs less abundant and shorter. Wings distinctly tinged 

 with brown on the distal half; stigma dark brown, 



A single male taken near the base of Mount Washington, August 1; 

 a female from the same State (F. H. Fall) ; another from New York (Pro- 

 fessor Liutcer); and others from Minnesota (E. Keen, July) and Cali- 

 fornia. Comparison is yet needed of American and European speci- 

 mens to determine the identity of ours with A', curvipes Loew. 



Bigot in his descri])tion of X. satanica dees not mention the black on 

 the tip of the hind femora, otherwise his description shows no important 

 differences. 



Xylota vecors. 



Xi/lota vecors Osteu Sackeu, Bull. Bull'. Soc. Nat. Sci., iii, G9 ; Cat. Dipt., 252. 



Hahitat. — White Mountains, New Hampshire (O. S.)! 



•'5, 2. Thorax brounish bronze color, abdomen blacii; legs, includ- 

 ing the coxai, ferruginous; end of hind femora, the hind tibiic and tarsi 

 black. Length, 13 to 14'"™. 



''Face and cheeks black, with a greenish rellection and a delicate 

 whitish down on the sides. Antenn<« reddis^i brown ; front black, with 

 some black, erect hairs. Thorax brownish bronze color, with indistinct 

 longitudinnl greenish stripes; pubescence sparse, short, erect, brownish 

 yellow, mixed with black ; a whitish sericeous spot inside of the humeri ; 

 plenia' greenish black, with blackish hairs. Scutelhim greenish bronze 

 <-olor. Abdomen black, with a bluisli or i)urplish rellection and scat- 

 tr-red whitish and black hairs. Knob of halteres black, stem reddish. 

 Legs ferruginous, including the coxa3 ; the tip of ungues brown; the 

 distal third of the hind femora, the hind tibia), and hind tarsi black. 

 Wings tinged witii brownish, proximal half more hyaline; stigma dark 

 brown. 



"Three males and two females. 



•' In general appearance this species is very like the Euro])ean X.femo- 



