ABT. 10 TROPICAL AMERICAN DIPTERA — VAN DUZEE 15 



3 females, taken by C. M. Rouillard, at Obispo, La Providencia, 

 Guatemala. 



Type and allotype in the Museum of Comparative Zoology. 



Paratypes. — Female, Cat. No. 41033, U.S.N.M,, from Guatemala. 



PSILOPUS CLAVATUS, new species 



Male. — Length 4 mm. ; of wing the same. Face green, when seen 

 obliquely nearly covered with silvery white pollen, its suture a little 

 above the middle. Palpi small, black; proboscis yellow. Front 

 shining green. Antennae black, longest bristles on second joint 

 about as long as the antenna, third joint small, rounded ; arista dorsal, 

 about as long as the width of the head. 



Thorax and first five abdominal segments shining green, sixth and 

 seventh violet; bristles of the thorax and abdomen moderately long; 

 scutellum with two pair of large bristles. Hypopygium (fig. 24) 

 brown with short brown appendages ; venter brown. 



Fore coxae, all femora and tibiae yellow, middle and hind coxae 

 black; all femora with white hair below, which is as long as width 

 of femora; fore tibiae with a row of four or more bristles on pos- 

 terior surface, which are twice as long as the diameter of tibia ; mid- 

 dle tibiae with a row of 15 bristles on anterior surface, which 

 are twice as long as diameter of tibia; hind tibiae with a small 

 bristle near the base, one at apical fourth and one near the tip ; ex- 

 treme tip of hind tibiae black ; fore and middle tarsi inf uscated from 

 the tip of first joint; hind tarsi wholly black; fore tarsi (fig. 25) 

 with a long bristle near the base and a still longer one at about apical 

 fourth, last joint slightly widened; middle basitarsi with four or 

 five short bristles below; hind tarsi (fig. 26) with the last three 

 joints considerably flattened and widened; joints of fore tarsi as 

 92-32-22-11-7; those of middle ones as 102-27-21-12-6; joints of 

 posterior tarsi as 81-28-11-12-9. Calypters yellow with tip and 

 cilia black; halteres wholly yellow. 



Wings grayish with the usual crossbands faintly marked; the 

 hyaline space between them reaches third vein ; they fill out the space 

 in front of the fork of fourth vein, extending back as an infuscation 

 of the first part of this fork, of the cross vein and last section of fifth 

 vein to wing margin ; cross vein 30, last section of fifth vein 18, fourth 

 vein from the cross vein to the fork 62 and from fork to wing mar- 

 gin twenty-three fiftieths of a millimeter long ; the last section of fifth 

 vein ends abruptly at one-third the distance to the wing margin; 

 fork of fourth vein bends backward so as to make less than a right 

 angle with basal part of fourth vein; upper bend of fork with a 



