12 PROCEEDINGS OF THE NATIONAL, MUSEUM vol.74 



PSILOPUS PANAMENSIS, new species 



Male. — ^Length about 3.5 mm.; of wing 3.5-4 mm. Face green, 

 usually blue on lower portion, where there is a little gray pollen, the 

 suture near apical third, making the lower portion about as wide as 

 long. Palpi and proboscis black. Front violet. Antennae black; 

 bristles of second joint one and a half times as long as the antenna, 

 third joint small, somewhat conical; arista dorsal, a little longer than 

 width of head. 



Thorax and abdomen dark green, the former with violet reflec- 

 tions and a little brown pollen; bristles of the thorax and abdomen 

 numerous and rather long; sides of abdomen with long white hair, 

 especially on basal part; scutellum with two pair of large bristles. 

 Hypopygium (fig. 20) black, outer appendages brownish yellow, 

 the small clavate appendages to the larger lamellae are yellow and 

 fringed with long hairs. 



Coxae, femora and hind tarsi black; tibiae and fore and middle 

 tarsi brown ; fore coxae with long white hair ; all femora with some 

 long white hairs below, those on anterior pair bristle-like, fore 

 femora also have black hair on both sides, which is longer than the 

 width of femora ; fore tibiae with a row of six bristles of increasing 

 length on upper surface, the longest ones being almost as long as 

 second joint of fore tarsi; middle tibiae with three bristles above, 

 two of which are as long as the longest on fore tibiae; hind tibiae 

 with a row of slender bristles on basal two-thirds of lower anterior 

 surface and a row of somewhat shorter hairs on the whole of lower 

 posterior surface; fore tarsi with the fifth joint slightly widened; 

 middle basitarsus with a few irregular and very small spines; joints 

 of fore tarsi as 66-18-13-7-7; of middle ones as 82-26-19-9-5; 

 joints of posterior pair as 67-27-18-9-8. Calypters, their cilia and 

 the halteres black. 



Wings grayish; costa without cilia; first vein reaching nearly to 

 the middle of the wing; last section of fifth vein 20, cross vein 41, 

 fourth vein from the cross vein to the fork 40, from the fork to 

 wing margin twenty-five fiftieths of a millimeter long; cross vein 

 oblique ; fork of fourth vein bending backward a little so as to make 

 the angle with fourth vein less than a right angle. 



Described from six males, taken by Nathan Banks, July 4, and 

 August 7 and 8, 1924, at Bella Vista, Panama. 



Type. — In the Museum of Comparative Zoology. , 



Paratype.—M^lQ, Cat. No. 41031, U.S.N.M. 



PSILOPUS NITIDICAUDA, new species 



Male. — Length 3.7 mm. Face green, seen from in front shining, 

 viewed from above covered with silvery white pollen, which extends 



