Williston.] ^^^ [May 19, 



EristaIjIS tenax (Linnu), Moig. Atlantic and Middle States, "Washington 

 Territory ! Europe, Asia, Africa. A single specimen from the Pacific 

 coast agrees in everyrespect with Eastern ones. The distribution of this 

 species is remarkable ; although at present very abundant in the region of 

 New England, it was never observed or known to collectors longer ago 

 than 1874 ! 



Eristalis flayipes, var melanostomus Lw., Centur. vi., G9. I 

 have a single female specimen from Oregon that I doubtfully refer to this 

 species. While the dorsum of the thorax is black pilose the yellowish pile 

 of the abdomen is confined to the terminal segments. I have collected 

 large numbers of flavijyes in Connecticut, and among them I have found 

 typical specimens of melanostomi and others agreeing quite with the speci- 

 men from Oregon, Avhile still others have the yellowish pile of the abdo- 

 men more or less intermixed with black. A typical melanoxtomus pre- 

 sents a very different appearance from flavipes, and yet from the col- 

 lection I have, I doubt the specific distinction. The name melanostomus 

 may be retained, however, to express the diflterence, more particularU^ 

 of the dorsal thoracic pile. 



Eristalis stipator O. S., West. Dipt., 336. Colorado, Western 

 Kansas ! New Mexico, California. 



Eristalis hirtus Lw., Cent, vi, 60 ; O. S. West. Dipt., 335. Wash. 

 Terr., Oregon, California, Colorado ! A very common species, over thirty 

 specimens are in my collection. They show a considerable valuation as 

 observed by Osten Sacken (1. c). 



Eristalis (?) Meigenii Wied. , Aus. Zwei. lus. ii, 177, 35, pi. x., fig. 15. 

 (E. androclusO. S.), Brazil (Wied.) New England ! Utah, Alaska (see 

 O. Sacken. West. Dipt, 337). This species agrees so closely with Wied- 

 man's figure and description of Meigenii from Brazil, that I believe it to be 

 the same. I shall, however, send specimens for comparison with South 

 American ones. 



Eristalis jioxtanus, sp. nov. 



rj^.— Eyes thickly pilose, sub-contiguous ; front and face reddish-black 

 with yellow pile, the facial stripe and cheeks black, shining ; antenn* 

 brownish-black, arista bare. Thorax black, densely covered with yellow 

 pile, the scutellum yellow. Abdomen reddish-yellow, with thick reddislr' 

 yellow pile, first segment black ; second segment in the middle opaque 

 black, narrowed behind, in the third segment the black is confined to a 

 broad median stripe, opaque in front, shining behind ; fourth segment 

 similar, wholly shining, hypop3''gium black. Legs black with black pile, 

 all the tibiaj at the base yellowish-red. Wings hyaline with a brown spot. 

 Long. corp. 12 mm. One specimen. Wyoming Territory. 



Eristalis occidentalis, sp. nov. 



(5^9- — Eyes pilose, front (9) brownish-black, dusted with yellow on 

 the^ides, face on the sides thickly covered with same colored dust, and 



