16 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



stump vein; first vein reaching two-fifths the length of the wing; 

 costa with minute hairs. 



Described from one male, taken by Nathan Banks, August 6, 1924, 

 at Ancon, Panama Canal Zone. 



Tyfe. — In the Museum of Comparative Zoology. 



PSILOPUS SIMULANS, new species 



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

 blue below, covered with silvery white pollen when viewed obliquely, 

 the suture near the middle. Palpi black, proboscis brownish yellow. 

 Antennae black, second joint with bristles as long as the antenna, 

 third joint small, rounded; arista dorsal, a little longer than ■width 

 of head. Front shining green. 



Thorax and abdomen shining green with coppery reflections and 

 short bristles; abdominal segments with broad basal black bands; 

 last segment more blue. Hypopygium (fig. 27) and its large, round- 

 ed lamellae mostly shining black, the lamellae with long bristles at 

 tip. 



Coxae and femora black; tips of fore and middle femora and all 

 tibiae yellow ; fore and middle tarsi black from the tip of first joint ; 

 extreme tips of posterior tibiae and their tarsi black; fore coxae 

 with long white hair; all femora with white hair below, which is 

 scarcely as long as width of femora; fore tibiae with two slender 

 bristles on lower posterior edge, which are longer than their diameter, 

 and two shorter ones near the base on upper anterior edge; middle 

 tibiae with three bristles on upper anterior edge which are nearly 

 twice as long as the diameter of the tibia and several very short ones 

 below; posterior tibiae with two very short bristles, one at basal 

 fourth and one near the middle; fore tarsi (fig. 28) with three long- 

 bristles below on first joint, and very small spines on the two follow- 

 ing joints; middle basitarsi with minute, irregular bristles; joints 

 of fore tarsi as 61-18-20-14-8 ; those of middle ones as 78-25-17-15-7 ; 

 joints of posterior pair as 60-23-17-9-8. Calypters and their cilia 

 black ; halteres yellow. 



Wings grayish with the usual crossbands, the hyaline space between 

 them reaches the third vein and is rather narrow between third and 

 fourth veins, the first band reaches the tip of first vein; venation 

 very much like that of clavatus^ new species; cross vein 35, last 

 section of fifth vein 16, fourth vein from the cross vein to fork 48, 

 from fork to wing margin twenty-three fiftieths of a millimeter long; 

 the portion of fourth vein beyond the fork nearly reaches the wing 

 margin ; upper bend of fork rounded ; first vein about two-fifths the 

 Jlength of the wing. 



