18 
Psyche 
[Mar. 
Cerceris nigrescens Smith 
Smith, Cat. Hymen. Brit. Mus., IV : 466, 1856. 
Specimens from Wawawai (W. M. Mann) ; Wenass 
Valley, 7 July (Hensliaw) ; Spokane, 21 June (Henshaw) ; 
Ainsworth, 20 July (Henshaw) ; and Gulf of Georgia (A. 
Agassiz), all in Washington. Also occurs in Montana, 
British Columbia, and eastward. 
Cerceris varians Mickel 
Mickel, Nebr. Univ. Studies, XVII : 336, 1917. 
Paratype before me from Donner Lake, Calif. ; others 
from Mammoth, 17 Sept.; Sequoia National Park, 25 
July; and San Mateo County, 20 June, all in California. 
Cerceris munda Mickel 
Mickel, Nebr. Univ. Studies, XVII: 337, 1917. 
Described from Sacramento, Calif. I have not seen it. 
Cerceris thione sp. nov. 
Male. Black; markings pale yellowish, the face verg- 
ing to white ; most of mandibles, basal joint of antennae, a 
small spot back of eyes, pronotum wholly, tegulae, spot 
below tegulae, scutellum, postscutellum and a fairly broad 
stripe each side on propodeum, pale yellowish; rest of 
antennae brown, but rufous below for a few joints and the 
last joint also rufous. Each segment of abdomen with an 
apical band, that on second plainly broader than those 
behind, none much widened on sides ; venter with lateral 
yellow spots on third, fourth, and fifth segments. Legs 
yellowish, front and mid femora rufous on base, hind 
femora rufous, darker on lower edge; more than apical 
half of hind tibiae black, hind tarsi nearly black, except 
basitarsi. Wings almost hyaline, brown, beyond the yel- 
lowish stigma, the tip more broadly brown. 
Hair of face short, white, vertex and thorax densely 
dark-haired, on propodeum long and white, that on ab- 
domen above longer than usual. Body densely and rather 
finely punctate. 
Mid lobe of clypeus projects triangularly below, and 
the white hair-lobes are much less than their breadth 
