70 PROCEEDINGS OF THE NATIONAL MUSEUM, VOL. 62. 
the dorsum silvery white, reclinate, more dense than on the venter. 
Coxae and femora largely brownish yellow, tibiae yellow with brown- 
ish tips, base of the tarsi yellow, the larger part brown; pile of the 
femora whitish. Wings whitish hyaline; stigma yellowish; the veins 
largely yellow; cross veins and fork of Rs black and faintly clouded, 
as are the veins closing the cell first A; cell M-3 closed and short 
petiolate. 
Female.—Length 9 mm. Very nearly like the male in general 
appearance. Frons entirely yellow pollinose, very long and without 
markings (fig. 56), a few short black pile on the vertex. Mesonotum 
more uniformly brownish gray, the brown vittae not as distinct as in 
the male in the specimens examined; a few brown pile in addition to 
the white pile. Dorsum of abdomen largely yellow, the sides and 
venter largly blackish gray; thin pollen of abdomen gray; first four 
segments with reclinate white pile, the fourth with some erect black 
pile, the segments posterior to the fourth with short erect black pile. 
Genitalia and terminal circlet of spines yellowish. Legs entirely 
yellowish, the bristles blackish brown. Wings as in the male, the 
stigma brownish and the wings generally with a more brownish tinge. 
Type locality—Los Angeles and San Diego Counties, California. 
Type.—Male, No. 10415, U.S.N.M. 
I have designated as a neallotype a female collected at Coronado, 
San Diego County, California, July 9, 1890 (F. E. Blaisdell), [Cal. 
Acad. Sci.]. 
Distribution.—The distribution according to the seven males and 
three females examined is: 
Arizona: Tucson, March 29 and April 8, Santa Catalina Mountains, 
3 miles west of Sabine Canyon (J. F. Tucker), [Harrisb. coll.]. 
California: Santa Clara County, (Harkins), [Stanford U.]; Laguna 
Beach (Baker) ; Claremont (Baker), [both Pomona College]; Coronado, 
San Diego County, July 8 and 9 (¥. E. Blaisdell); Oak Glen Lodge, 
San Bernardino County, 5,000 feet (F. Daggett), [both Cal. Acad. 
acl PSILOCEPHALA ACUTA Adams. 
Plate 6, fig. 57; plate 7, fig. 67; and plate 8, fig. 87. 
1903. Psilocephala acuta Apams, Kans. Univ. Sci. Bull., vol. 2, p. 222. 
This species is easily recognized from the original description. 
There is a female in the Stanford University collection marked ‘‘type,” 
probably a cotype, from which figures 57, 67, and 87 were made. 
The species is nearly related to P. tergissa, described below. 
Type locality Englewood, Clark County, Kansas. 
Types.—In the Kansas University collection. 
