ART. 10 TROPICAL AMERICAN DIPTERA VAN DUZEE 9 



which is probably the same species but is badly broken, at Ancon, 

 Panama Canal Zone, August 6, 1924. 



Type. — In the Museum of Comparative Zoology. 



PSILOPUS CYLINDRICUS, new species 



Male. — Length 3.5 mm. ; of wing 2.6 mm. Face and front green 

 with blue reflections, face covered with silvery white pollen when 

 seen obliquely, its suture a little below the middle; front with a few 

 yellow hairs on upper orbits, palpi small, black; proboscis yellow. 

 Antennae black, third joint small, rounded, one bristle on second 

 joint about as long as the antenna; arista dorsal, not as long as 

 width of head. 



Thorax and abdomen shining green, scutellum and first two abdom- 

 inal segments mostly blue; thorax with a very little white pollen 

 along the front; scutellum with two pairs of large bristles; bristles 

 of thorax rather large, those of abdomen short, except on last two 

 segments; venter green with a few short pale hairs. Hypopygium 

 (fig. 16) small with rather long, black lamellae. 



Fore coxae, all femora and tibiae yellow; fore coxae with short 

 white hair and two black bristles; middle and hind coxae and tips of 

 hind femora black ; all femora with long pale hairs below, which are 

 not as long as their width ; fore tibiae with two small bristles below 

 and two still smaller ones above; middle tibiae with several small 

 bristles; hind tibiae a little brown at tip, with two small bristles on 

 upper anterior edge, tarsi brown, plain ; joints of fore tarsi as 50-24- 

 20-10-9; those of middle ones as 67-21-16-9-6; joints of posterior 

 pair as 64^23-15-11-9; calypters yellow with black tips and cilia; 

 knobs of halteres yellow. 



Wings grayish; costa with very short recumbent hairs; fork of 

 fourth vein at neai'ly right angles to fourth vein, distance from fork 

 to cross vein 38, from fork to wing margin 24, last section of fifth vein 

 18 and cross vein thirty-one fiftieths of a millimeter long; first vein 

 reaching about two-fifths of the length of the wing. 



Described from one male, taken by Nathan Banks in 1924 at 

 Gamboa, Panama Canal Zone. 



Type. — In the Museum of Comparative Zoology. 



PSILOPUS ANGUSTATUS, new species 



Mcde. — Length 6.7 mm.; of wing 6 mm. Face a little narrowed 

 below, green with violet or blue reflections, lower part almost wholly 

 blue, suture slightly above the middle. Palpi black, proboscis yel- 

 lowish brown. Front violet with black hair on upper half, which is 

 quite long next to the orbits. Antennae black, first joint brown below ; 

 second joint with only a few bristles, the longest being scarcely longer 



