170 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



A siu«ile specimen, taken June 15 in Connecticut, agrees quite with 

 Loew's description, except that tlie femora are in a greater degree reddish. 

 T«i Walker's specimen that he described, the legs were wholly ferrugin- 

 ous, except the tip of tarsi. The color of the femora is evidently variable, 

 and 1 have no doubt that the present is, as Baron Osten Sacken sus- 

 pected, Walker's species. The species will be easily recognized by the 

 blackish marking along the fore border of the wing. 



Sristalis transversus. (Plate VII, fig. 8.) 



Erisfalis iraiisversns Wiedemann, Auss. Zw. Ins., ii, 188, 51. 



JErtstalis pliiladelphiciis Macqnart, Dipt. Exot., ii, 2, 34, 6; pi. viii, fig. 4. 



Erisfalis 2)umiliis Macquart, Dipt. Exot., ii, 2, 57, 43. 



Eristulis viltatiis Macquart, Hist. Nat. Dipt., i, 307, 19. 



Eristalis zonatus Bigot, Ann. Soc. Ent. France, 1880, 217. 



Habitat. — Atlantic States ! 



<?",$. Length, 7 to 12™™. Eyes pilose on upper half, broadly contig- 

 uous in the male. Frontal triangle black, shining in the middle, polli- 

 nose on the sides, the pile black ; front in female with black pile, nar- 

 rowed above, on the lower two-thirds reddish polliuose, just above the 

 base of the antennae shining black, around the ocelli also somewhat 

 polliuose, below the ocelli velvety black, extending downwards into 

 three points, one along each eye and one in the middle. Antennae 

 reddish yellow, the first two joints and the upper part of the third 

 often brownish or blackish ; arista reddish, the basal portion sparsely 

 plumose. Face concealed on the sides beneath dense whitish pollen and 

 whitish pile, the median stripe and cheeks shining black. Dorsum of 

 thorax opaque black, with three grayish olivaceous transverse bands, 

 the first along the front border, the second just before the suture, the 

 third midway between this and the scutellnm ; pile not at all abundant, 

 lutesceut, on the pleurae more abundant, yellow. Scutellnm bright 

 jellow, along its base narrowly black. Abdomen in the male as fol- 

 lows : first segment black ; second segment with large lateral triangles, 

 and narrow posterior border, bright yellow, elsewhere wholly opaque 

 black, extending narrowly to the lateral margins ; third segment with 

 a large quadrilateral spot on each side in front, and posterior border, 

 yellow, the black is opaque, except a narrow shining cross-band that 

 cuts ofi"a small opaque spot in front; fourth segment with a small yel- 

 low spot on each anterior angle, and a posterior yellow border, broader 

 than on the preceding, remainder of the segment opaque black with an 

 entire shining (;ross-band before the middk^ of the segment; hypopyg- 

 ium shining black. In the female the lateral spots of the second seg- 

 ment are smaller, the second, third, fourth, and fifth segments with a 

 narrow yellow hind border and an entire, or snbinterrupted shining 

 cross-band on the anterior part of each segment; on the third and 

 fourth segments sometimes with a small yellow spot on the sides in 

 front. Legs variable ; usually black with the tip of femora and base 

 of tibiae yellow; at other times the distal half of all the femora and the 



