114 PROCEEDINGS OF THE NATIONAL MUSEUM, VoL. 62, 
Wings hyaline, the veins light brown, stigma brown, the cross veins 
and fork of Rs clouded brown; cell M-3 closed near the margin. 
Female.—Length 11.5 to 13 mm. Very nearly like the male. 
Pile of head and mesonotum much shorter. Frons yellowish gray 
pollinose and black pilose, with a large, reverse heart-shaped, shining 
black callosity, reaching the ocellar tubercle above and joined to the 
eyes on the sides by a dull black mark. (Fig. 121.) Upper occiput 
yellowish gray pollinose; face and lower occiput white pollinose and 
pilose. Some black pile at the lower corner of the eye. 
Mesonotum gray pollinose on the lateral margins, the main portion 
dark brown, with two wide yellowish white vittae, so that an appear- 
ance is given of three wide dark-brown vittae. Base of scutellum 
brown, the larger part gray pollinose. Mesonotum with short recli- 
nate yellow pile in addition to the erect black pile, the reclinate pile 
continued on to the scutellum. 
Abdomen shining black; first segment gray pollinose, segments 
two to six with narrow yellowish posterior borders and a gray polli- 
nose area anterior to this, narrow in the middle of the dorsum and 
expanded on the sides. The black portions of the first three seg- 
ments reclinate blackish pilose, the rest yellowish white; all pile 
beyond the third segment short, erect, black. Genitalia shining 
black, the circlet of bristles yellowish red. Legs colored as in the 
male, the pile of femora much shorter and whitish. Veins of wing 
largely with a narrow border of pale brown, more distinct on the 
cross veins. 
Distribution.— Distribution according to 4 males and 24 female 
specimens: 
Two female specimens taken in the Hope Mountains, British 
Columbia, July 19 (R. S. Sherman) and one specimen from Paradise 
Valley, Mount Rainier, Washington, July 17 (E. C. Van Dyke), may 
prove to be different; in these specimens the frontal callosity is 
divided in the middle by an impressed line, on either side of which it 
projects into a hemispherical body. It is in general a darker form, 
with the markings of the wings darker. 
Canada: Ile de Montreal, July 14 (Beaulieu); Ottawa, Ontario 
July 9 (Beaulne); Rigaud, Quebec, June 27 (Beaulieu); Lillooet, 
British Columbia, May 26 and September 6 (W. B. Anderson), [all 
Canad. coll.]; ‘Canada’ (Osten Sacken), [M. C. Z.]; Hope Mountains, 
British Columbia, July 19 (R.S. Sherman); Similikameen, British Co- 
lumbia, July 20 (R. S. Sherman), [Sherman]; Montreal, Quebec, June 
17 [Amer. Mus.]; Kearney, Ontario, July 2 to 8 (M. C. Van Duzee), 
[Van Duzee]; Jordan, Ontario, June 29 (C. H. Curran), [Cole]. 
New Hampshire: Mount Washington, August 7 (C. W. Johnson), 
[Cole]. 
