ART. 10 TROPICAL AMERICAN DIPTERA VAN DUZEE 35 



pale hair; hypopygiiim rather small, black, becoming yellowish on 

 apical half; it has pale yellow lamellae (fig. 52) with two long 

 hairs at tip and several curled and branched ones below. 



Coxae and femora black; fore coxae with pale hair; tips of femora 

 broadly yellow; tibiae and tarsi yellow, the tarsi scarcely darker at 

 tip; fore tarsi (fig. 47) with the third joint (fig. 48) enlarged and 

 with a thin, translucent plate on one side; this plate has long bent 

 hairs on the edge of apical portion; joints of fore tarsi as 20-14-10- 

 5-5 ; of middle ones as 27-10-7-8-5; joints of posterior pair as 13-27- 

 17-7-G. The bristles of the tibiae appear yellow, at least in certain 

 lights; halteres pale yellow. 



Wings grayish, veins broAvn ; last section of fifth vein 15, cross vein 

 eleven-fiftieths of a millimeter long; venation normal. 



Described from one male, taken by Nathan Banks, June 27, 1924, 

 at Barro Colorado Island, Panama Canal Zone. 



Type. — In the Museum of Comparative Zoology. 



MEDETERA SCAURA, new species 



Male. — Length, 3 mm. Face and front blue or violet, the latter 

 green along the orbits; antennae black, third joint small, scarcely 

 as long as wide, rounded, with an apical arista; lateral and inferior 

 orbital cilia yellow. 



Thorax a'nd abdomen shining green, their hairs and bristles black, 

 in one specimen the thorax and scutellum have violet reflections; 

 lateral edges of the thorax with a narrow coppery streak; scutellum 

 with two pair of bristles; propleurae with two short, black bristles 

 above each fore coxa. Hypopygium pedunculate, black with yellow 

 appendages. 



Coxae and femora bjack; tips of femora, the tibiae and tarsi yellow, 

 last one or two joints of the tarsi black ; fore and middle coxae with 

 pale hairs on anterior surface ; fore femora with a few black bristles 

 near the tip on lower posterior edge; posterior femora with two 

 rather large bristles near the middle of anterior surface ; hair on all 

 femora black and conspicuous; fore tarsi (fig. 50) widened from the 

 base to tip of third joint; last two joints very small, black, third 

 joint rounded at tip; joints of fore tarsi as 24^15-15-3-5; those of 

 middle ones as 32-18-14^6-7; joints of posterior pair as 17.-31-22- 

 10-8. Calypters, their cilia, and the halteres yellow. 



Wings a little grayish, veins yellowish brown ; last section of fifth 

 vein 20, cross vein nineteen-fiftieths of a millimeter long; venation 

 normal. 



Described from five males taken by J. M. Aldrich ; two were col- 

 lected April 14 and 16, 1926, at La Providencia, Obispo, Guatemala; 

 the other three at Coban, Alta Vera Paz, Guatemala, May 20, 1926. 



ry^e.— Male, Cat. Xo. 41048, U.S.N.M. 



