212 Annals Entomological Society of America [Vol. XI, 



pleurae irregularly marked with black and reddish yellow^ the meso- 

 pleurae blackened except toward the cox^e. Abdomen yellowish, the 

 middle and apical segments black, scales of the middle segment prom- 

 inent on a gray velvety setting, abdominal hairs yellow. Legs yellow, 

 the tarsi becoming dusky at the apex, front legs devoid of setulse, middle 

 femora and tibice with close-set rows of black setulae, anterior femora 

 with a long basal, yellow bristle underneath, hind tibicC with a single 

 black extensor bristle at two-fifths its length, the apical spur blackened, 

 curved and pointed. Halteres pale yellow. Wings yellowish hyaline, 

 their roots yellow, veins brown, costal sections proportioned 4 : 1.5 : 

 2.5 : 1, third and fourth veins parallel toward the end, anterior cross- 

 vein at middle of the second basal cell, posterior cross-vein at the middle 

 of the wing, sections of the fifth vein 2:1, costal hairs conspicuous. 



Two specimens: San Jose, Costa Rica, March, 1915, 

 received from Dr. A. H. Sturtevant. 



Elaphropeza simplicipes, sp. nov. 

 Length 1.5 mm. Yellow, head cinereous black, scutellum, meta- 

 notum, middle segment of the abdomen and a vague prescutellar spot 

 blackish, antennae, mouthparts and legs yellow, middle tibiae of the male 

 with microscopic denticles within, of the female without denticles. 

 Front narrow, shining, its sides nearly parallel, face linear, white- 

 pollinose, vertical bristles brownish, third antennal joint conical, one- 

 half longer than broad, the arista microscopically pubescent, about two 

 and one-third times the antennal length. Mesonotum with sparse 

 hairs, its bristles yellow; lateral setute of the middle segment of the 

 abdomen flattened ; upper valve of the brownish pygidium rounded and 

 sericeous, the apical fringes short. Legs rather slender and short, front 

 femora without black setae, the two extensor bristles of the hind tibiae 

 close together, the apical spur moderate, yellowish, velvety and rather 

 acute, last tarsal joint not dark. Wings less than three times as long 

 as broad, veins yellow and thin, second, third and fourth sections of the 

 costa proportioned 1 : 1.7 : 1, third and fourth veins straight and 

 slightly diverging, sections of the fourth vein proportioned 1 : 1 : 2.2, 

 of the fifth vein, 1 : 0.4. 



Montego Bay and Balaklava, Jamaica. Type in the Boston 

 Society of Natural History. 



A male specimen from Victoria, Texas, in the U. S. National 

 Museum, is associated here. It is larger, measuring two milli- 

 meters, has the outer antennal joint dark, the metanotum 

 reddish and the last tarsal joint dusky. Although phyletically 

 it probably represents a distinct species the visible differences 

 are too slight to utilize. 



Elaphropeza tenera, sp. nov. 

 Length 1.5 mm. Polished black of a brownish tinge, hairs very 

 sparse and pale. Front narrow, the sides nearly parallel, at the bottom 

 less than one-half the width of the second antennal joint ; ocelli minute, 



