72 
Psyche 
[April 
Psilopus longi talus sp. nov. 
Male; Length 5 mm. Face bare; fore coxae and all femora 
and tibiae yellow ; all tarsi plain with only short hairs and bristles, 
except the fore basitarsus which has three long slender bristles; 
middle tibiae with only minute scattering bristles, which are 
scarcely as long as the diameter of the tibiae. 
Face bare, blue-green with white pollen. Front shining 
blue with the upper corners green. Antennae black; its second 
joint with a bristle above which is twice as long as the short 
third joint; arista as long as the height of the head. Lateral 
and inferior orbital cilia white. 
Thorax, scutellum and basal half of first abdominal seg- 
ment blue, the remainder of the abdomen green with bronze 
reflections, its incisions black. Bristles of the thorax and ab- 
domen rather short. Hypopygium and its appendages black, 
formed about as in sipho Siud furcatus. 
Fore coxae wholly yellow with yellow hair and two black 
bristles; middle and hind coxae and their trochanters black with 
white hairs and black bristles; femora and tibiae yellow, posterior 
tibiae scarcely blackened at extreme tip. All femora with long 
yellow hairs below and about three small black bristles near the 
tip. Anterior tibiae with four long black bristles on lower pos- 
terior edge; middle pair with only very short, scattering bristles; 
hind tibae without bristles. Fore basitarsi equal to their tibiae 
in length, and with three long slender bristles on posterior 
surface, they are yellow with the extreme tip black; last four 
joints taken together scarcely as long as the first. Middle 
tarsi with the first joint nearly one and one fourth times as 
long as their tibiae, black from the extreme tip of first joint; last 
four joints taken together about half as long as the first. Hind 
tarsi black, plain, first joint a little more yellowish and longer 
than the remaining four joints taken together. Calypters and 
halteres yellow, the former black with tip and cilia. 
Wings with two brown cross-bands connected on the costal 
edge as far back as the third vein, the basal band covers the 
