156 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



whitish yellow pile. Femora black, their tip, the tibite, aud first two 

 or three Joints of the tarsi, reddish yellow ; terminal joints of all the 

 tarsi black. Hind femora thickened, their coxai with an obtuse tuber- 

 cle. Wings faintly brownish, anterior basal portion luteous, outer part 

 brownish; third vein somewhat arcuate, cross vein near the middle of 

 discal cell. 



9 . Third joint of the antennte a little larger; front black, with black 

 pile, and a grayish dusted cross-band below the middle, slender in its 

 middle part. The abdomen is wholly light yellowish pilose ; the hind 

 coxa' without a tubercle below, and the femora uot thickened nor curved. 



Six specimens. White Mountains, New Hampshire, July 15 (Dr. G. 

 Dimmock), Canada (J. B. Caulfield, William Brodie), New York (Van- 

 derzee), New Mexico (Gaumer). 



This species in its thickened femora, partially obsolete abdominal 

 cross-bands, and distinctly curved third longitudinal vein, connects this 

 genus with Arctophila. 



Sericomyia chalcopyga. (Plate VII, tigs. 2, 2a.) 

 Sericomyia chalcopyga Loew, Ceutur., iii, 20. 



Habitat. — Sitka (Lw.), Washington, Oregon! 



5,2. Length, 12 to 15""". Front in female black, whitish pollinose 

 on the sides below, clothed with bla^k pile; frontal triangle black pilose. 

 Antennffi reddish black or black, third joint subquadrate, scarcely longer 

 tlian wide, a little broader at the end ; arista blackish, twice as long as 

 the joint. Face yellow, with whitish pile; broad median stripe and 

 cheeks shining bhick ; scarcely at all excavated below the antennae. 

 Occiput black; orbits yellowish white pollinose, and with similar col- 

 ored pile, more or less black above. Thorax black, bluish shining, with 

 blackish pile, more or less yellowish in front and behind ; on the meso- 

 pleurse with a yellow tuft, and just above the suture a smaller one. 

 Scutellum more or less reddish on the disk; i)ile mostly black. Abdo- 

 men black, opaque, with short black pile, aud with three narrow yellow 

 fasciae, nearly transverse, narrowly interrupted; second segment on its 

 sides with yellow pile ; third segment very narro.wly shining on its pos- 

 terior border ; fourth segment broadly behind ; fifth segment wholly, shin- 

 ing metallic green, clothed with longer reddish-yellow pile; the lateral 

 margin of the abdomen with a fringe of similar reddish-yellow pile. All 

 the femora slender ; black at the base, or nearly entirely so ; their outer 

 half or tip, the tibi£e, and first two or three joints of the tarsi, reddish- 

 yellow; terminal joints of all the tarsi black. Wings a little fuscous; 

 in front as far as the cross-vein brownish yellow, be.yond faintly black- 

 ish ; the veins in the yellowish part are mostlj' yellowish or reddish; 

 third vein very slightly concave, almost straight, cross-vein distinctly 

 before the middle of discal cell, oblique. 



Fifteen specimens. 



