SYNOPSIS OF NORTH AMERICAN SYRPHIDiE. 133 



Front divergent on the sides below, on the upper two-thirds black, cov- 

 ered with whitish pollen. Thorax black, thickly covered with whitish 

 pollen, in the middle in front with two black linear stripes ; humeri, 

 post-alar callosities, and the scutellum, yellowish- red, the last rounded, 

 much broader than long. Pleurae dark, thickly whitish dusted, a black 

 spot above the middle and hind coxae. Abdomen reddish-yellow, with 

 slender brownish hind borders on the second, third, and fourth seg- 

 ments. Legs brownish-yellow, the last two joints of all the tarsi black- 

 ish ; bind tibiae, and basal joints of hind tarsi, brownish. Wings nearly 

 hyaline, faintly clouded at the tip; stigma yellowish; posterior cross- 

 vein not much longer than the penultimate section of the fourth vein, 

 the included angle obtuse. ' 



One specimen (H. K. Morrison). This species is allied to B. hicolor 

 of Europe, but differs from a single specimen I have for comparison, as 

 well as the description, in the front being broader below, and black 

 above, in the tarsi, etc. 



Brachyopa vacua. 



Braclujopa vacua Osteu Sackeu, Bull. Buff. Soc. Nat. Sci. iii, 68 (by typograph- 

 ical error vacua); id., Cat. Dipt., 247; Williston, Proc. Am. Phil. Soc, xx, 

 :iOb. 



Brachyopa cinerto-viftata Bigot, Aunales Soc. Ent. de France, 1884, 537. 



HaUtat. — Canada, California ! 



'' 9 . Lengtli, 8 to O'""^. Brownish-gray, thorax with three brown 

 stripes; abdomen brown, its basal third whitish-yellow, with a brown 

 line in the middle ; arista bare. 



Face, front and vertex, densely clothed with a grayish pollen ; lower 

 part of the face very much projecting ; a brownish stripe runs across 

 the cheeks from the eye to the mouth; antennae brownish, grayish 

 poUinose, arista bare, brownish-reddish at base. Thoracic dorsum yel- 

 lowish-gray, with three brown stripes, the intermediate one geminate 

 and abbreviate posteriorly. Scutellum brownish-yellow. Abdomen 

 brown, shining ; first and second segments whitish-yellow (as if trans- 

 lucent), the second brown posteriorly and with a longitudinal brown 

 line in the middle. Legs grayish-brown, hind femora slightly incrassate, 

 on the under side with a brush of short, spine-like bristles. Wings 

 distinctly tinged with brownivsh, especially on the distal half, anteriorly ; 

 first posterior cell distinctly petiolate at the distal end, the petiole being 

 equal in length to the small cross-vein. 



"B'a&tfa^.— Quebec, Canada (Mr. F. X. Belanger), a single male spec- 

 imen. The interval between the distal ends of first posterior and discal 

 cells is a shallow sinus, and not a right angle as in B. notataJ^ — Osten 

 Sacken, 1. c. 



A single female specimen from Kern County, California, I have 

 scarcely a doubt belongs here ; the differences from the description are 

 very slight. The color throughout is apparently a little darker, and 

 the legs are rather reddish than grayish brown. I do not see that the 



