SYNOPSIS OF NORTH AMERICAN SYRPHID^. 85 



pile. Halteres yellow : tegulse with a browuisli border. Abdomen 

 elongate oval, black, opaque, only a little shining; second segment 

 with a very small reddish-yellow spot on the sides before the middle; 

 third and fourth segments with a narrow cross-band near the front, 

 broadly and rectangularly interrupted, touching the lateral margin; 

 narrow hind margins of the fourth and fifth segments and anterior an- 

 gles of the fifth yellow. Legs dark brown; the tips of the femora and 

 base of the tibiie only narrowly and obscurely yellowish; the hind legs 

 and all the tarsi black, the hind metatarsi a little thickened. Wings 

 obscurely hyaline, the stigma only a little darker, all the veins blackish. 

 "Differs from /S'. nmbeUatarum in being a little smaller (about 7.5'»") ; 

 the face in profile is much more projecting, the facial tubercle a metal- 

 lic blackish-green, which color extends on both sides along the oral 

 border; in the other species the facial tubercle bears a distinct stripe ; 

 in the female the sides of the face, powdered with yellow pollen, have 

 a brownish-yellow groundcolor; the antennse are inserted on black 

 ground ; the front in the female is brownish green, much broader than 

 in S. iimheUaiarnm ; the pollen on the sides is much less thick; it fol- 

 lows on both sides the orbit of the eye to about one-half the distance 

 between the ocelli and the antennae, and does not reach as much tow- 

 ards the vertex as in the other species; it does not form a well defined 

 arch ; the glabrous space above the antennce is smaller. The thorax is 

 brownish green (not bluish green) ; the scatellum has a stronger bluish 

 metallic rollection : the yellow markings on the abdomen are somewhat 

 narrower, and paler yellow; the four anterior legs are of a darker red- 

 dish brown, sometimes almost black, with paler knees; when the legs 

 are i)aler the base of the femora does not appear abruptly tinged with 

 black, as in >S'. umheUatarum.^^ — Osten Sacken. 



Syrphus umbellatarum. 



? Syrjjhus umhellafanim Schiner, Fauna Anstr., i, p. 307. 



? Syrphiin guttatm Walker, List, etc., iii, 586. 



Syrphus 6-qiiadrutu8 Walker, List, etc., 566. 



Syrphus umheUatarum Osten Sacken, Proc. Bost. Soc. ITat. Hist., 1875, 151. 



Habitat. — White Mountains, Xew Hampshire, Arizona ! 



" c^ , $ . Length, 8 to 9™'". Antennae blackish brown. Thorax shining 

 metallic green ; pleurne thickly whitish pollinose and with whitish pile. 

 Abdomen subopaque black, with three interrupted cross-bands, about 

 one-third of the width of the segments, situated on their anterior parts. 



"Zema?e.— Eyes glabrous. Face yellow, with a whitish pollen almost 

 concealing the ground color; in the middle a brown stripe, crossing the 

 facial prominence, but abruptly stopping before the base of the antennoe; 

 this stripe does not run down on both sides along the oral margin (it 

 does so for a short distance in a very few specimens); oral margin yel- 

 low, as well as the cheeks ; front and vertex bluish green (not brownish 

 green) ; the yellowish-gray pollen on the front forms a well-marked arch, 

 sub-interrupted in the middle, leaving bare on one side the vertex, 



