SYNOPSIS OF NORTH AMERICAN SYRPHIDiE. 73 



vertex also, black. Auteiiiuie brownish black, the first two joints and 

 the base of the third below, reddish. Face yellow, with a bluish reflec- 

 tion, on the sides thinly whitish pilose, no dark spot nor stripe on the 

 tubercle; cheeks below the eyes, in front, black, behind and across the 

 posterior oral margin, yellow. Thorax brownish greenish black, shin- 

 ing, the pile, especially on the sides and on the pleurae, orange colored. 

 Scutellum only a little yellowish, more bluish opalescent, black at the 

 base and corners; pile in large part black. Abdomen black, but little 

 shining, except on the first segment, the narrow margin of the second 

 and third segments, and 'the fourth and fifth wholly; with three pairs 

 of bright yellow spots, all very distinctly separated from the lateral 

 margins; the first pair small, oval, broadly separated from each other, 

 near the middle of the segment; second pair large, nearly square, with 

 rounded angles, more than half as wide as the segment, not reaching 

 the front margin, separated by scarcely half their width ; the third pair 

 a little smaller, somewhat oblique, and sometimes. touching the front 

 margin ; fifth segment yellow, with a large triangular black spot. Legs 

 reddish yellow; coxae, except the trochanters, front and middle femora, 

 hind femora, except narrowly at the base and the outer third or fourth, 

 hind tibiae, except the base and tip, and the hind tarsi, brown or black. 

 Wings tinged with brownish, the stigma brown. 



Four specimens. 



The large spots on the third and fourth segments, which are very dis- 

 tinctly separated from each other and the lateral margins, together with 

 the bare eyes, will distinguish this species from any described from 

 North America. A single female from the Boston Society of Natural 

 History (S. Henshaw) is closely allied to this, possibly it is the same. 

 It differs, however, in the spots of the second segment being larger, 

 narrowly separated, those of the third and fourth segments longer trans- 

 versely and not so wide, and more narrowly separated ; the abdomen, 

 except the second segment, is more shining, the dorsum of the thorax 

 more shining greenish, and on the sides thickly yellowish pollinose ; the 

 sides of the front are yellow on the lower part. It is probably another 

 species, but more specimens are needed to settle the question. 



Syrphus velutinus. 



Si/rjihiis vehttimis Williston, Proc. Am, Phil. Soc, xx, 314, 1882. 

 Isclnjrof<iirphus tricolor Bigot, Annales Soc. Ent. tie France, 1884, 73. 



Hahitat.—^loxxxit Hood, Oregon!, California (Bigot). 

 ^ , 9 . Length, 11 to 12°^". Eyes very distinctly pilose in both sexes. 

 Front shining green-black with black pile. Antennae black or brown- 

 ish black. The yellow of the face is obscured somewhat by a metallic 

 bluish reflection, a rather broad black shining stripe in the middle, ex- 

 tending along the oral border to the cheeks, which, with the lower part 

 of the posterior orbits, are greenish black. Dorsum of thorax black, 

 slightly greenish, only a little shining, pile abundant, rather long, light 



