SYNOPSIS OF NORTH AMERICAN SYRPHID^. 165 



the middle, especially below, the vertex darker. Thorax greenish- 

 black, nnicolorous, shiniug, beset with yellow or yellowish pile, some- 

 times more orauge-colored, denser on the pleurae. Scutellum reddish- 

 brown, translucent ; second abdominal segment with a yellow triangle 

 of the usual shape on each side, sometimes brownish-yellow ; an opaque 

 black cross band on the anterior margin, another one along the poste- 

 rior side of the yellow" triangles; the latter is interrupted or snbinter- 

 rupted in the middle, oblique on each side, and not reaching the lateral 

 margins ; a smooth bluish-black space is inclosed between the two 

 cross-bauds and the triangles ; a narrow shining triangular space be- 

 tween the hind cross-baud and the yellowish-white posterior margin of 

 the segment, which bears a fringe of pale golden-yellow pile ; the third 

 and fourth segments have the same pale-yellowish posterior margin 

 and fringe of pale-golden pile; on the fourth segment, however, the 

 fringe is broader, ai»d takes in the whole posterior half of the segment; 

 on the posterior half of the third segment there is on each side in the 

 male usually an elongated opaque black streak ; the anterior margin 

 of the third segment has a narrow pale border, as if prolonging the 

 hind margin of the preceding segment. Hypopygium black. Legs 

 black ; tip of the femora and basal half of the tibiae yellowish- white; 

 on the middle pair three fourths of the tibiae and the base of the tarsi 

 are of a i)ale color. Wings hyaline ; stigma small, brown. 



Six specimens from California (Morrison), the male of which lacks 

 the velvety lateral spots on the third segment ; a single male from 

 Western Kansas and a female from Topeka, Kans. (Popeuoe) ; also, 

 seven males and three females from Colorado and five from Arizona 

 (Professor Comstock). Since writing the above 1 have found the spe- 

 cies very abundant on the Kansas plains iu August. 



Xiristalis Brousi. 



Eristalis Androclus Osten Sacken (not Walker), West. Dipt., 337: Cat. Dipt., 



note 223, p. 249. 

 Eristalis f Meigenii ( Wied.) Willistou, Proc. Am. Phil. Soc, 319 (male). 

 Eristalis Brousii Willistou, ibid., 323 (female). 



Habitat — Canada, New England, Washington Territory !, Utah, 

 Alaska (O. S.). 



$ ,9 . Length, 10 to 12"". Face black, shining, thickly clothed with 

 yellow pollen and pile, leaving the tubercle, the oral margin, and the 

 cheeks shining black. Frontal triangle a little shining along the mid- 

 dle; iu the female the front reddish pollinose, more shining above the 

 antennae. Antennae black, third joint somewhat reddish ; arista red- 

 dish, briefly pilose near the base. Eyes pilose, in the male contiguous 

 for a short distance only; posterior lateral orbits white- pollinose. Tho- 

 rax black, shining, on the dorsum with a coppery luster, leaving two 

 opaque, lighter colored, rather broad stripes, reaching from the front to 

 the scutellum, limited by three narrow, opaque-, black stripes; pile of dor- 



