36 PEOCEEDINGS OF THE NATIONAL MUSEUM vol. 74 



MEDETERA PALLIDICORNIS, new species 



Male. — Length, 2.5 mm. Face and front green; apical part of 

 proboscis and the palpi yellow; antennae wholy yelloAv, third joint 

 rounded ; arista apical, yellow at base, more brown at tip ; lower 

 orbital cilia yellow. 



Thorax and abdomen green ; dorsum of thorax with brown pollen, 

 which is visible when viewed from in front; propieurae with one 

 black bristle above each fore coxa; scutellum with two pair of 

 bristles; bristles of thorax black; hairs of abdomen pale, the bristles 

 on the hind margins of the segments black. Hypopygium (fig. 51) 

 blackish with yellow appendages, the outer lamellae rather long, 

 curved with curled hairs, some of which are branched. 



Coxae and basal half or more of femora black; apical part of 

 femora, the whole of the tibiae and tarsi, together with their hairs 

 and most of their bristles yellow; hairs of fore coxae yellow; tarsi 

 plain; joints of fore tarsi as 27-14^10-5-5; those of middle pair as 

 30-14-10-3-4; joints of posterior tarsi as 18-30-17-8-6. Calypters, 

 their cilia, and the halteres yellow. 



Wings grayish, veins yellowish, costa brovrn; last section of fifth 

 vein 22, cross vein twelve-fiftieths of a millimeter long. 



Feinale. — About the same as the male; wings the same; joints of 

 posterior tarsi about the same length as in the male. 



Described from two pairs taken by J. M, Aldrich, April 16, 1926, 

 at La Providencia, Obispo, Guatemala. 



ry^e.— Male, Cat. No] 41049, U.S.N.M. 



MEDETERA VARIPES, new species 



Mole. — Length 3 mm. Face, front and anterior part of thorax 

 blue, sometimes the latter blue-green; antennae black, third joint 

 small, rounded; arista apical; proboscis and palpi black; lower 

 orbital cilia yelloAvish. 



Posterior part of thorax and the abdomen green ; dorsum of thorax 

 with gray pollen, which is conspicuous when seen from in front; 

 bristles of the thorax black, anterior part of thorax with minute 

 yellow hairs; hairs of the abdomen yellow; bristles above fore coxae 

 black; scutellum v\'ith two pair of bristles. Hypopygium black, its 

 ap])endages yellow, among these is a slender yellow filament, fringed 

 on one side with long hairs. 



Coxae, basal half of fore femora and basal four-fifths of middle 

 ones black ; hairs of fore coxae yellow ; apical part of fore and middle 

 femora, whole of posterior femora, trochanters, all tibiae and tarsi 

 yellow, tips of tarsi darkened; hairs of femora and tibae yellow, 

 except a few long black hairs on upper basal part of posterior 

 femora; fore tarsi (fig. 46) with third joint enlarged on the side, 



