210 Annals Entomological Society of America [Vol. XI, 



1.5 : 2 : 1, the third and fourth veins straight, very sHghtly divergent, 

 the last two sections of the fourth vein proportioned 1 : 2.7, of the fifth 

 vein, 2.5 : 1, hairs of hind margin short. 



One specimen: Corazal, Canal Zone, Panama, March. 

 Collected by August Busck for the U. S. National Museum. 



Elaphropeza pleuralis, sp. no v. 

 Length 2 mm. Robust, yellow species marked with black, hairs 

 and bristles yellow. Occiput polished black, the occipital bristles longer 

 than the ocellar; front very narrow, its sides converging below, at the 

 bottom one-fourth as wide as the second antennal joint, eyes almost 

 contiguous below the antennae ; palpi pale yellow and with a few yellow 

 hairs, proboscis luteous; antennae horizontal, pale yellow, the second 

 joint with a circle of setulae but without seta beneath, third joint short- 

 lanceolate, one and one-half times as long as wide, the terminal arista 

 pubescent, two and one-half times as long as the antenna. Thorax 

 luteous, marked with a black, prescutellar spot, which is round in front 

 and includes the scutellum and metanotum behind, a round prealar 

 spot on the mesopleurae, encroaching on the sternopleura ; mesonotal 

 hairs sparse, two rows of four acrostichals, a pair each of prescutellar 

 and scutellar bristles. Abdomen yellow, not chitinized except the black 

 middle segment and the narrow one following, sides of these segments 

 with many flattened black setute; last tergite fringed with hairs, 

 hypopygium small, elongate, rather hairy. Legs yellow, the last tarsal 

 joint black, only the middle femora with preapical bristle, spur of the 

 hind tibiae long, blunt, brown, two extensor bristles on the hind tibiae, 

 one at the middle and one half-way to the knee. Halteres whitish, 

 calypteres dark, with seven brown cilia. Wings clear hyaline, veins 

 thin and brown, the second, third and fourth sections of the costa pro- 

 portioned 1.5 : 2.5 : 1, the third and fourth veins parallel, the submar- 

 ginal cell at the end of the first vein one-half as wide as the marginal and 

 at the end of the second vein equal to the first posterior, last two seg- 

 ments of the fourth vein proportioned 1 : 2.7, of the fifth vein, 2.5 : 1, 

 marginal cilia short. 



Four specimens: Alhajuelo, Panama, and Orizaba, Vera 

 Cruz; from the U. S. National Museum. 



Elaphropeza plumea, sp. nov. 

 9 . Length 2.2 mm. Robust shining yellow species with black 

 occiput and heavily pubescent arista, discal cell large. Front very 

 narrow, almost linear, shining black, face linear and black, occiput 

 finely gray pollinose, cheeks and proboscis yellow, palpi large and 

 white, epistome white pollinose; vertical bristles black; antennae yel- 

 low, the second joint with uniform setulae, the third joint ovate, one-half 

 longer than broad, the blackish arista including its dense hairs appearing 

 as thick as one-half the diameter of the third joint. Thoracic hairs 

 moderately dense, the bristles yellowish; tip of the scutellum, center of 

 the metanotum and a prescutellar spot brown. Middle segment of the 



