1918] Dipterous Genus Drapetis Meigen 209 



prescutellar spot is lacking but the scutellum is blackish like the meta- 

 notum and abdomen. The upper occipital orbits are polished and the 

 veins are only moderately brown. The wings of both variations are 

 less than three times as long as broad. Possibly these specimens rep- 

 resent distinct species. They are deposited in the U. S. National 

 Museum. 



Elaphropeza luteicollis, sp. nov. 



Length 1.5 mm. Slender, the head and abdomen black, thorax 

 reddish, legs yellow, apex of the tibiae black, hairs and bristles yellow. 

 Front narrow, its sides slightly converging below, at the bottom one- 

 fourth as wide as the second antennal joint, eyes separated by a line 

 beneath the antennae; palpi white, proboscis short, brown; antenna 

 horizontal, yellow, no seta beneath, the third joint lanceolate, one-half 

 longer than wide, the arista two and six-tenths times as long as the 

 antennae, its pubescence close and short. Thorax reddish yellow, the 

 metanotum and rarely the scutellum brown, hairs very sparse, two rows 

 of two acrostichals, only four hairs in the dorsocentral rows. Sides of 

 middle abdominal segment with flattened setulae; hypopygium black, 

 nearly bare. Hind tibiae with two extensor bristles trisecting its length, 

 the terminal spur long and sharp. Halteres yellow. Wings clear 

 hyaline, veins narrow, light brown, marginal celf moderately long, the 

 second, third and fourth sections of the costa proportioned 1 : 1.8 : 1, 

 the third and fourth veins straight, uniformly and slightly diverging, 

 the first posterior cell widest at the apex, the anterior cross-vein at the 

 middle of the second basal cell, last two sections of the fourth vein 

 proportioned 1 : 3, of the fifth vein, l.S : 1. 



Forty specimens, collected by August Busck for the U. S. 

 National Museum in various places in the Canal Zone of 

 Panama. 



Elaphropeza nigricans sp. nov. 



cT. Length 1.7 mm. Near tenera but with longer antennae, shorter 

 arista and more hairy body. Front narrowly V-shaped, at the bottom 

 one-third as wide as the second antennal joint; ocellar and vertical 

 bristles long and blackish; antennae black, the second joint without 

 long seta, the third joint lanceolate, twice as long as wide, the terminal 

 arista scarcely longer than the antennae, short-pubescent; eyes nearly 

 contiguous below the antennae; palpi white, and with a few white hairs; 

 proboscis short and brown. Thorax polished black, but uniformlv 

 covered with long, black hairs, forming four rows of acrostichals with 

 about eight hairs to each row, prescutellar and scutellar pairs of bristles 

 long and black. Abdomen shining black, the sides of the middle segment 

 with many scale-hke setulae; hypopygium minute. Legs yellow, the 

 outer third of hind femora brown, hind tibiae with two extensor bristles 

 and with a very short and blunt apical spur. Halteres whitish ; calyp- 

 teres with five dusky hairs. Wings clear hyaline, veins narrow but 

 dark, the second, third and fourth sections of the costa proportioned 



