34 Psyche [April 
pulvilli of fore tarsi as long as the fifth tarsal joint, those of 
middle and hind tarsi about equal in size but not nearly as large 
as those of fore tarsi. Tegule and halteres pale yellow, the cilia 
of the former black. Wings tinged with gray, slightly brownish 
at extreme base; veins black; first vein reaching nearly half the 
distance to the tip of the second vein. 
Described from three males from California. Two taken at 
Los Cerritos, Los Angeles Co., March 21, and April 3, and one 
taken at Alpine, San Diego Co., April 10. 
This closely resembles D. lamellatus Loew but differs in the shape 
of the lamellze of the hypopygium and in having longer hair on the 
under side of the hind femora on their apical half. The lamellee 
of lamellatus are gradually narrowed towards their base while 
this species has them narrowed abruptly into a slender stem. 
Diaphorus nudus sp. nov. 
Male: Length, 2.5 mm. Face about as broad as long, covered 
with gray pollen; palpi black, eyes contiguous; antennz small, 
black, third joint rounded at tip about as long as broad; arista 
subapical; orbital cilia blackish. Thorax dark brown with brown- 
ish gray pollen and with a very slight greenish reflection poste- 
riorly. Abdomen black; shining on the dorsum, in well preserved 
specimens with light gray pollen on the sides which contrasts 
strongly with the center of the dorsum; hairs of the abdomen 
black; hypopygium small with its appendages scarcely visible, the 
bristles at its tip of moderate size. Coxee and femora black; 
extreme tips of fore femora, tibize and first two tarsal joints of all 
feet yellow, extreme tips of hind tibize and tips of first two tarsal 
joints of all feet black; tarsi blackened from the third joint; fore 
femora nearly bare below; fore tarsi about one and one-half times 
as long as their tibize; fore pulvilli enlarged; fore tibize without 
bristles; middle tibize with one minute bristle before basal third, a 
little shorter than their tarsi; hind tibiz with three or four small 
hair-like bristles above, slightly longer than their tarsi. Tegulee 
brown with brown cilia; knob of halteres pale yellow, stem dark 
brown. Wings grayish hyaline; veins brown; first vein reaching 
half way to the tip of the second vein; fourth vein ending a little 
back of the tip of the wing; last section of fifth vein about twice as 
