48 PROCEEDINGS OF THE NATIONAL MUSEUM, VOL. 62. 
pilose; the narrow posterior margin and the posterior corners of sec- 
ond segment silvery white; white pile on the silvery parts and on the 
lateral margins of first segment; a silvery spot on each side of the 
fifth segment. The apical gray-brown marking in the wing more 
extended. 
Type locality—Hood River, Oregon, July 3, 1917, on strawberry 
plants (*. R. Cole). 
Type.—Male, Cat. No. 25933, U.S.N.M. 
What appears to be a variety of this species occurs in southern 
California. The front tibiae are brown at the base and the others 
largely yellowish; the basal joints of the tarsi are more or less yellow- 
ish. The central wing spot is much reduced and the apical spot 
missing. ‘The species is very close to platancala Loew. 
Paratype.—There are 10 males and 18 females, distributed as 
follows: 
Oregon: Hood River, July 3 (Cole), [Cole]. 
California: Los Angeles, April 29 (M. C. Van Duzee), [C. W. 
Johnson]; Colton, May 26 (KE. P. Van Duzee); South Fork, Kings 
River Canyon, altitude 5,000 feet, Fresno County, July 4 (K. C. 
Van Dyke); Sobre Vista, Sonoma County, May 8 (J. A. Kusche); 
Ki] Cajon, San Diego County, April 28 (KE. P. Van Duzee); Shasta 
Springs, June 13 (C. L. Fox), [all Cal. Acad. Sci.]; Compton, April 
15 (Cole); Redlands, May and June (Cole), [Cole]. 
PSILOCEPHALA PLATANCALA Loew. 
Plate 6, fig. 44; plate 7, fig. 76; and plate 8, fig. 90. 
1876. Psilocephala platancala Loew, Zeitschr. Ges. Naturwiss., new ser., vol. 
14, p. 321. 
Female,—Length 8to9mm. Black, partly gray pollinose. Vertex 
gray pollinose and a very narrow margin of frons next the eye. 
Face silvery pollinose; frons shining black, the shining portion reaching 
slightly beyond the base of the antennae. (Fig. 44.) Antennae black, 
third joint slightly longer than the first and slightly broader, all the 
antennal joints gray pollinose. A few minute black hairs just above 
the antennae. Palpi black or blackish brown, with black pile. 
Occiput gray pollinose, the pile below white. 
Thorax and scutellum black, the mesonotum, pleura, and scutellum 
gray pollinose; sides of mesonotum thinly pollinose or semishining, 
the pollen of pleura silvery gray. A very faint median brownish 
stripe on mesonotum. Scutellum with four black bristles. Knob 
of halteres black, the stem blackish brown. 
Abdomen almost wholly shining black, first segment and base of 
second thinly gray pollinose; posterior margin of second and a very — 
thin line on posterior margin of third sternite silvery gray pollinose; 
