ART. 10 TROPICAL AMERICAN DIPTERA — VAN DUZEE 7 



Fore coxae, all tibiae, fore and middle femora, first three joints 

 of fore tarsi and first joint of middle tarsi yellowish brown ; middle 

 and hind coxae, hind femora and tarsi mostly black or metallic ; all 

 femora with long white hair below; fore coxae with quite long 

 white hair on inner anterior surface and two black bristles on outer 

 anterior edge; fore tibiae with four rather small bristles above; 

 middle tibiae with a row of about fourteen bristles of about equal 

 length; fore tarsi (fig. 8) with the fifth joint nearly round, first 

 joint with three bristles; middle tarsi (fig. 9) with a row of hairs 

 having their tips slightly enlarged, extending the whole length of 

 the first two joints, also four stout bristles on first joint; hind tarsi 

 (fig. 10) with the last three joints flattened and widened, the last 

 two (fig. 11) arched and provided with bristles below, seemingly 

 to form a grasping organ; joints of fore tarsi 57-19-13-7-4; middle 

 ones as 114-20-15-6-5; joints of posterior pair as 74-15-6-10-11, 

 width of fifth joint as 8. Halteres and cilia of the calypters black. 



Wings grayish; venation about as in longipennis; fourth vein 

 from the cross vein to the fork 53, from fork to wing margin 20, last 

 section of fifth vein 13, and cross vein thirty-three fiftieths of a milli- 

 meter long; first vein reaching the middle of the wing. 



Described from one male taken by Nathan Banks, July 6, 1924, at 

 Bella Vista, Panama Canal Zone. 



Type. — In the Museum of Comparative Zoology. 



PSILOPUS BICOLORIPES, new species 



Male. — Length 4 mm.; of wing 4.5 mm. Face green, wide above, 

 narrow below, almost without pollen, its suture near apical third. 

 Palpi and proboscis black with pale hair. Front mostly blue or violet. 

 First two antennal joints black (third missing in type) ; longest 

 bristle on second joint about twice as long as width of joint. 



Dorsum of thorax green with violet reflections, dulled with a little 

 brownish pollen; pleurae largely yellow or yellowish brown. Abdo- 

 men green, first segment and narrow incisures of following segments 

 blue ; bristles of thorax and abdomen moderately long. Hypopygium, 

 small, brown, its lamellae (fig. 12) large, thin, whitish with a brown 

 border (partly folded in the drawing), and having irregular pro- 

 jections and hairs on the edge. 



All coxae, femora, and middle and hind tibiae and tarsi brownish, 

 fore tibiae and tarsi yellow; fore coxae with long white hair; all 

 femora with long white hair below; fore tibiae with six slender 

 bristles of increasing length on anterior surface ; middle tibiae with 

 three bristles, the one near the middle and one near apical third 

 nearly as long as the second joint of middle tarsi; posterior tibiae 

 with long hair and a row of about seven slender bristles on anterior 

 surface of basal half, which are twice as lon^ as the diameter of the 



