112 
Psyche 
[J une-August 
Columbia River near Trinidad, Washington, May 1, 1919 and 
Wenatchee, Washington, April 12, (Melander) . Four males 
and six females. The species presents a curious superficial re- 
semblance to Ahlatus mimus O. S. with which it is associated in 
the sandy desert region. 
Cyrtopogon caesius, new species 
Male . — Length 9 mm. Related to C. rattus 0. S. Head 
heavily whitish pruinose, vertical hairs white and black mixed, 
facial hairs similar but longer, the black hairs predominating 
below, occipital pile abundant, white and very fine, third anten- 
nal joint long and slender, the arista not very distinct, quite 
as thick as end of third joint and in length about one-fourth 
the latter, its basal joint undeveloped. Thorax heavily polli- 
nose, its pile rather short sparse and black, three black lat- 
eral bristles and a cluster of about three postalar, four intraalar 
bristles, median geminate stripe black, lateral stripe interrupted 
at the suture so as to form a broad presutural blackish round 
spot and an indefinite broad postsutural stripe, front margin 
and humeri grayish-white ; scutellum fiat, white pruinose, its 
margin with black setiform hairs and white pile; pleurae uni- 
formly white pollinose, pectus with fine white pile, trichostical 
hairs dense and white. First abdominal segment entirely white 
pruinose, second and third segments with narrow white band 
on front margin and broad white band on hind margin, the inter- 
vening space shining black, remaining segments shining black, 
the hind margin broadly white pruinose, the white bands do not 
encroach forward on the sides of the tergites; hypopygium scarcely 
widening at termination of the abdomen, lateral valves cupuli- 
form; hairs of abdomen long tufted and white at side margins 
of basal three segments, largely short and black on remaining 
segments, under side of hypopygium with yellow hairs, tuft of 
grayish hairs at apex of venter. Legs entirely black, femora 
and posterior tibiae white pilose, front tibiae with black pile 
on front face, dense yellow pubescence on inner face and loose 
comb of black setiform hairs on both outer and flexor surfaces 
and another comb of black bristles on forward face, setiform 
