166 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



suui li<;iit reddish yellowisli, scarcely apparent from above; pile of the 

 plearuj whitish. Scutellum subtraiislucent yellowish or reddish on the 

 outer part. Abdomen in the male as follows : first segment black ;• 

 second segment orange-yellow, broadly on the sides and narrowly 

 across on the hind border, elsewhere ojjaqne black ; on the posterior 

 part the black includes nearly a third of the width of the segment; the 

 sides approach each other a little towards the tiont and then at nearly 

 right angles extend outward along the anterior margin of the segment; 

 the lateral i)rolongations are convex on their hind borders and reach 

 acutely nearly to the lateral margins ; third segment with large, similar 

 colored si)ots, coulluent with the yellow in front, but rounded on the 

 internal posterior angles and usually not quite reaching the yellow of 

 the hind margins; across the middle of the segment a shining metallic 

 band interrupted in the middle, elsewhere the black is opaque; fourth 

 segment wholly shining, with a narrow yellow hind margin and some- 

 times with a small spot of opaque black in front ; hypopygium shining 

 black. In the female the markings are rarely like those of the male, 

 chiefly shining black ; the second segment sometimes with a small red- 

 dish spot on the side, the opaque marking as in the male ; the third 

 and fourth segments sometimes with a small opaque spot in front; sec- 

 ond, third, and fourth segments sometimes rather broadly whitish pol 

 linose on the hind border ; the hind margins more narrowly reddish- 

 yellow. Legs black, a little stout; tip of femora and base of tibiae 

 reddish or whitish yellow. Wings hyaline ; stigma minutely brownish ; 

 in the female with a large faint brownish spot. 



Twelve male and six female specimens from Connecticut and an equal 

 number from New York and Pennsylvania ; also one male from Toronto 

 (Brodie) and one from Washington Territoiy (Professor Hagen). 



This species is remarkably like E. arbustoriim from Europe in size, 

 shape, and coloration, but a careful examination discloses differences 

 which are evidently specitic. With E. Meigemi Wied. ( Auss. Zw. Ins., ii, 

 177; pi. XV, fig. 15), from South America, the resemblance must be even 

 greater; the full descirption applies almost perfectly. 



Osten Sacken observ^es that the specimens from Yukon River, Alaska, 

 have the arista dark and the velvety spots on the abdomen somewhat 

 diflt'ereut. 



Eristalis montanus. 



Kriatalis inoututnis Williston, Proc. Am. Phil. Soc, xx, 322. 

 Habitat. — Wyoming ! 



$. Length, 11 to 12™"". Face reddish -yellow pollinose, and white 

 pilose, on the sides ; the median stripe and broadly on the cheeks shin- 

 ing black. Frontal triangle black in the middle, with yellowish ])ile. 

 Antennae black ; arista reddish, ])ubescent near the base. Eyes wholly 

 pilose; approaching each other in front of the ocelli, but not quite con- 



