arr. 4, REVISION OF THE FAMILY THEREVIDAE—COLE. 95 
yellow, the four marginal bristles black, the middle pair close together 
and crossing; pile of upper pleura yellowish, the rest of the pile, in- 
cluding that on the coxae, white. Stem of the halteres blackish gray, 
the knob yellowish. 
Abdomen black, gray pollinose, with a yellowish tinge on the dor- 
sum; pile of dorsum pale yellowish, longer on the first segment, more 
or less reclinate on the first three segments, on the following segments 
short and erect; eighth segment and genitalia shining blackish and 
short erect black pilose, the circlet of bristles black. Short pile of 
venter erect and white. Femora with tomentumlike silvery white 
pile and erect white pile, only a few erect hairs on the hind femora 
near the base. Cell M—3 closed and short petiolate or very narrowly 
open in the margin of the wing. (Fig. 158.) 
Distribution.—The species has been recorded from Oregon, Cali- 
fornia, Washington, and North Carolina. The North Carolina record 
given by Kroéber is undoubtedly erroneous, the form referred to being 
a new species described in this paper as bimaculata. Twenty-six 
males and fourteen females were examined from the following locali- 
ties: 
Canada: Savary Island, British Columbia, June 30 to August 14 
(R.S. Sherman), [Sherman]; Buccaneer Bay, British Columbia, July 
17 (R. C. Treherne); Kamloops, British Columbia, May 25 (W.B, 
Anderson), [Canad. coll.]; Nanaimo, British Columbia, June 28 (KE. P. 
Van Duzee), [Cal. Acad. Sci.]. 
Oregon: No other data (Hdwards), [Amer. Mus.]; Hood River, 
June 2 to 20 (Cole), [Cole]. 
California: Fresno County (Edwards), [Amer. Mus.]; Blue Lake, 
Humboldt County, June 20 (Bradley); Alta Meadows, Sequoia 
National Park, 9,000 feet, July 19 (Bradley), [both Cornell]; Kern 
County [Kans. U.]; Shasta Springs, June 13 (C. L. Fox); Bradley, 
Monterey County, May 23 (K.P. Van Duzee), [both Cal. Acad. Sci.]; 
Los Angeles, April 3 (M. C. Van Duzee); Los Cerritos, Los Angeles 
County, April 3 (M. C. Van Duzee); Portola, June 5 (M. C. Van 
Duzee), [all Van Duzee]}; Palo Alto, April 30 to June 10 (Cole); Red- 
lands, May (Cole), [both Cole]; Santa Cruz Mountains, May (W. M. 
Mann), [R. C. Shannon]. 
THEREVA CALIFORNICA Krober. 
1912. Thereva californica KrOBER, Entom. Zeitung, vol. 73, p. 259. 
The following is a translation of the original description: 
Male.—In the group otiosa. Face silvery white, with white pile. Frontal triangle 
black, semishining. The middle has a hemispherical shining black callus. An- 
tennae black, with black pile. Occiput through tomentum whitish gray, with snow- 
white pile. Thorax shining black, with whitish gray pollen and white pile. Scutel- 
