54 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



short projection on the side and a long one at tip, the latter with 

 long yellow hairs on the edge and long, slightly clavate yellow 

 bristles on the surface of one side; the lamellae are yellow on basal 

 part, brown at apex. 



Fore coxae yellow with a narrow black ring near the base, an- 

 terior surface with a few minute black hairs ; middle and hind coxae 

 black with yellow tips; femora and tibiae yellow; tips of posterior 

 femora slightly brown above, their tibiae also brown at tip on pos- 

 terior surface; basal half or more of fore and middle tarsi yellow^ 

 hind tarsi almost wholly black; middle tarsi with the usual bend 

 between second and third joints (fig. 65 shoAvs the form of these 

 joints from above), which only shows from the side; joints of fore- 

 tarsi as 51-16^13-9-13; those of middle ones as 68-29-23-15-13; 

 joints of posterior pair as 51-53-35-21-17. Calypters brown with 

 black cilia, which are very long and dense, more brown toward the 

 tips of the hairs. Halteres yellow. 



Wings (fig. 66) unifoi-mly tinged with blackish brown; last sec- 

 tion of fourth vein nearly evenly arched, its tip before the apex of 

 the wing; last section of fifth vein bent, ending about half way to 

 wing margin; first section of costa enlarged so as to fill most of th& 

 costal cell. 



Female. — Color of all parts as in the male; face reaching a little 

 below the eyes, ending in a rounded point; calypters yellow at base, 

 black on apical half, their cilia normal, black; venation as in the 

 male, except that the costa is not enlarged and fifth vein is curved, 

 not bent as in the male and nearly or quite reaches the wing margin. 



Described from five males and three • females taken by J. M. 

 Aldrich, May 25, 1926, at Tamau, Alta Vera Paz, Guatemala. All 

 paratypes and the allotype were taken at the same time and place. 



Type.—MdXe, Cat. No. 41063, U.S.N.M. 



This form differs from 7iimiu€ Aldrich in the color of the an- 

 tennae; dUaticosta which I described from Arizona is still closer to 

 ni7nius, but seems to differ in the bend of the last section of fourth 

 vein (fig. 67) ; both nigricornis and dilaticosta differ in having the 

 bend between second and third joints of middle tarsi much less con- 

 spicuous and plain, while in nwidus the second joint is distinctly but 

 gradually enlarged and smooth on the side with about four bristles 

 at tip, which project into the bend, the third also has a projection on 

 the side near the middle, the apical end of which is abrupt. 



POLYMEDON PARTITUS. new species 



Male. — Length 4.7 mm. Face and front silvery white, face ex- 

 tending about its width below the eyes; palpi black, rather long; 

 proboscis black; antennae wholly black, first joint not elongated, 

 about as long as third, which is slightly longer than wide; lateral 



