208 Annals Entomological Society of America [Vol. XI, 



hypopygium nearly bare. Legs yellow, the front femora with a short 

 preapical bristle, that of the middle femora stronger, hind tibiffi with 

 two extensor bristles trisecting its length and with a short blunt terminal 

 spur. Halteres dirty yellow, calypteres fringed with five cilia. Wings 

 clear hyaline, the second, third and fourth sections of the costa propor- 

 tioned 1.5 : 2.5 : 1, third vein with pronounced anterior curve, the 

 fourth vein nearly straight, submarginal cell at the end of the first 

 vein nearly as wide as the marginal cell, and beyond the end of the 

 second vein narrower than the first posterior cell, which latter is widest 

 at three-fourths its length, the last two sections of the fourth vein pro- 

 portioned 1 : 2.7, of the fifth vein, 2:1, marginal ciHa short. 



Four specimens, Canal Zone, Panama, collected by August 

 Busck for the U. S. National Museum. The species is near 

 formoscB Bezzi, but has a longer arista. 



Elaphropeza laeta, sp. nov. 



d^, 9. Length 1.7 mm. Shining yellow, with yellow antennae, 

 mouthparts and legs, the scutellum, metanotum, abdomen and a pre- 

 scutellar spot blackish; middle tibiae denticulate within, front femora 

 not black setose. Head black except the posterior oral margin, occiput 

 cinereous-pollinose, front very narrow, almost linear, shining, eyes of 

 male contiguous below the antennae, obliterating the face, in the female 

 the eyes are subcontiguous ; vertical bristles brown, palpal setcE yellow; 

 third antennal joint ovate, one-half longer than broad, the arista closely 

 but microscopically pubescent, brown, two and a half times as long as 

 the antennse. Hairs of the thorax moderately abundant and long, 

 bristles yellow. Middle segment of the abdomen darkest, with lateral 

 flattened setulae, pygidium sericeous. Legs rather slender, front femora 

 sparsely ciliate below, middle femora with strong preapical bristle, not 

 denticulate below, the antero-flexor edge of the hind femora with stiff 

 yellow setse, six outstanding extensor hairs toward the base of the hind 

 femora, hind tibiee with a rather strong black terminal lappet, the two 

 extensor bristles separated by less than one-third the length of the 

 tibia. Wings three times as long as broad, veins strong and brown, 

 second, third and fourth sections of the costa proportioned 1 : 1.3 : 0.8, 

 third and fourth veins straight, slightly diverging, sections of the fourth 

 vein proportioned 0.9 : 1 : 2.2, of the fifth vein. 1 : 0.4. 



Five specimens: Alhajuelo, Panama; August Busck, col- 

 lector. Type in U. S. National Museum. 



Var. ungulifera, new. A male specimen from Corozal, Panama, 

 differs in having the spur of the hind tibia long, very slender and curved, 

 measuring as long as the third tarsal joint. The scutellum is reddish 

 and the prescutellar spot is lacking. The veins are light yellow and not 

 coarse. 



Var. nigrocalcarata, new. A male specimen from Alhajuelo, Panama, 

 differs in having the spur of the hind tibia very large and broad and 

 black, so it contrasts markedly with the remainder of the legs. The 



