SYNOPSIS OF NORTH AMERICAN SYRPHID^. 137 



sanguined correspondiug to var. haemorrJwidalis. The species, however, 

 shows a structural difference in the facial profile, the excavation being 

 less below the autennse. 



Volucella facialis. 



Vohicella facialis Williston, Proc. Am. Phil. Soc.xx, 316. 



Eabitat. — California ! 



$ ,9 . Length, 14 to 15"™. In structure precisely like the preceding 

 and correspondiug- in markings to V. hombylans, var. plumata of Europe. 

 That it may only be a variety of evecta I am not prepared to deny ; cer- 

 tainly greater differences exist among the varieties of Y. bomhylans. 



Face broadly yellow in the middle, and thickly clothed with yellow 

 pile ; the eyes of the female more pilose, the dorsum of the thorax and 

 the pleurae black pilose, otherwise not differing from V. evecta sanguinea. 



Volucella esuriens mexicana. (Plate VI, figs. 5, 5a.) 



Syrphus esuriens Fabricius, System Entom., iv, 281, 10; Syst. Antl., 226, 9. 

 Volucella esuriens Wiedemauu, Anss. Zw. Ins., ii, 197, 4; Schiner, NovaraExped., 



ii, 1, B. Diijt., 356, 54. 

 Volucella mexicana Macquart, Dipt. Exot., ii, 2, 25; tab. 5, fig. 3 ; Schiner, I. c, 



55; Osten Sacken, West. Dipt., 332. ' 



Volucella dispar Macquart, Dipt. Exot. ler Suppl., 123; tab. xi, fig. 2; Schiner, 



I.e. 

 Volucella metallif era Walker, List, etc., iii, 636. 

 Volucella Maximiliani Jaennicke, Neue Exot. Dipt., 87 ; Schiner, I. c. 



Habitat. — California, Arizona, Florida !, Mexico (Macq.), New Granada 

 (Macq.). 



S ,9 . Length, 16 to lO'"'^. Face deep chestnut-black, moderately shin- 

 ing, considerably excavated below the antennae, with a rounded pro- 

 tuberance near the middle, below this perceptibly concave, produced 

 directly downward into a conical tip, slightly notched at the extremity; 

 clothed with short white pile ; cheeks shining black. Antennae vary- 

 ing from a dark reddish to a quite black, or sometimes the tip only red- 

 dish ; third joint rather short, expanded at the base; arista moderately 

 plumose, on the upper side longer than below. Front in female narrow 

 above, gently convex, with yellowish pile, more black at the vertex or 

 sometimes the pile may be wholly blackish ; on each side there is a well 

 marked concentric groove. Eyes in both sexes obscurely yellowish 

 pilose. Thorax deep bluish-black, sometimes with a slight coppery 

 luster ; clothed with black ])ile, at times obscurely yellowish in front. 

 Scutellum deep chestnut-black. Abdomen a deep resplendent violet 

 or purplish, sometimes with a coppery luster, clothed with short stiff 

 bristle-like hairs and on the last two segments with black pile. Legs 

 black, with black pile. Wings hyaline ; on the basal portion to a little 

 beyond the tip of the auxiliary vein, brownish black ; the end is cutoff 

 squarely and, beyond, the subcostal cell is saturate yellow, extending 

 somewhat outwards ; the dark color extends backward to beyond the 



