SYNOPSIS OF NORTH AMERICAN SYRPHID^. 155 



Sericomyia sexfasciata. 



Sericomi/i.t m-j-fanciuta Walker, List, etc., iii. 5915. 



Habitat. — Hudson Bay Territory (Walk., Lw.)! 



$ . Length, 14.5™'". Face light yellow, thickly whitish pollinosej a 

 rather broad median stripe pitchy black; cheeks black. Anteunse 

 obscurely yellow; the basal joints blackish; the third joint nearly 

 square ; frontal triangle black, white pollinose ; pile of head light yel- 

 low. Dorsum of thorax shining metallic black ; clothed with erect, rather 

 abundant pile, in front and narrowly behind, and on the base and border 

 of scutellum, yellow; across the disk of the dorsum and scutellum, black; 

 pleuras with light yellow pile. Abdomen black, nearly opaque, on the 

 sides of the second segment, narrowly along the margins of the 

 abdomen, and hypopygium, with yellow pile, elsewhere chiefly black 

 pilose ; second, third, and fourth segments each with a pair of yellow, 

 elongate, moderately broad spots ; the spots do not reach the lateral 

 margins, and are rather broadly separated, and are most especially 

 characterized by a constriction in the middle, especially on the front 

 pair, where they are elongate hour-glass-shaped. Legs black ; the base 

 and tip of all the tibiae, and the tarsi, except the tip, yellow; the tibise 

 in the middle more of a deep browu. Wings yellowish hyaline, the im- 

 mediate base and the stigma yellow ; third vein with a gentle curvature 

 into the first posterior cell. 



One specimen, in the Loew type collection at Cambridge. 



Sericomyia militaris. (Plate VII. tigs. 3, 3«, :?&.) 

 Sericomyia militaris Walker, List., etc., iii, 595. 



HahUat. — Hudson Bay Territory, Kova Scotia (Walk.), l^ew York, 

 New Hampshire, Colorado, New Mexico, Canada!, Bed River. 



$. Length, 15""". Face whitish yellow, shining; cheeks and broad 

 median stripe black : i)ile whitish ; face receding below the antennae, 

 then vertical and straight to ihe i)rotuberance. Frontal triangle black ; 

 with black pile, white ])ollinose on the sides. Antennae nearly black, 

 third joint subquadrate, but little longer than wide; arista black. Orbit 

 white dusted and with white pile. Thorax black, shining; the dorsum 

 more bluish, clothed with rather abundant pile, darker between the 

 wings ; humeri whitish pollinose ; on the upper part of the mesopleurae, 

 and immediately above the suture, with a tuft of whitish yellow pile, 

 another smaller one on the post-alar callosity. Scutellum reddish black 

 on the disk. Abdomen greenish black, somewhat shining, with black 

 pile, whitish yellow on the lateral and posterior parts. Second seg- 

 ment with two small dots, sometimes wanting; third segment with two 

 very narrow, a little oblique spots, acute at their outer ends ; the fourth 

 with two similar, a little broader, spots, yellow ; the narrow posterior 

 border of second, more broadly on the third, and the fourth wholly, 

 metallic shining ; hind margin of the third segment with a fringe of 



