42 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 64 



nine long setae in posterior flexor row, middle femora with twelve 

 moderate setae in posterior row and about four oblique setae in ante- 

 rior row toward knee. Wings almost uniformly hyaline, costal ratio 

 4.5 : 1.2 : 1, fourth vein 1: 1: 2.6, fifth vein 2:1. Length 3 mm. 



Types. — Two males, La Suiza de Turrialba, Costa Rica, Pablo Schild 

 collector, in Melander collection. Several females from Mr. Schild 

 may be the same species. They all have weaker femoral setae, some 

 have darkened scutellum, none has the brown spot at end of antennae 

 nor the faint dorsal vittae, and one has shorter plumosity of the arista. 



66. SOBAROCEPHALA LACHNOSTERNUM, new species. 



(Fig. 21.) 



Front shining ochraceous, opaque luteous above the antennae, 

 ocellar dot black, face and mouthparts yellow, genae silvery pruinose, 

 a brownish line below each antenna, extending on bucca; antennae 

 luteous, arista short-plumose; head bristles brown, five delicate long 

 buccal hairs. Thorax shining ochraceous, pleiu'ae and coxae flavous, 

 sometimes, especially in female, with lateral brownish marks behind 

 the humeri, prescutellar setae sometimes absent, hairs of mesoster- 

 num and coxae long and conspicuous. Abdomen strongly setose, 

 brownish in male, yellow with brown middle portion in female; 

 hypopygium large and yellow, valves circular. Legs uniformly 

 yellow except the bro\\Tiish front tarsi, flexor setae of anterior 

 femora strong and black. Wings nearly hyaline, costal ratio 5 : 1.3 : 1, 

 sections of fourth vein 1: 1:3.3, of fifth vein 1:2.6; halteres pale 

 yellow. Length 3 mm. 



Puparium. — Reddish brown, closely and transversely striate, 

 last segment irregularly rugose, posterior extremity mth two hooks, 

 each with basal prong on inner side, anal opening elliptical and sur- 

 rounded by a black trapezoidal plate, no sharp margin at rear of last 

 sternite. Length 5 mm. 



Types. — Ten specimens, Rosslyn and Dead Run, Va., bred by 

 Shannon from larvae found in rotting wood. Type, Cat. No. 26272, 

 U.S.N.M. 



67. SOBAROCEPHALA LATIFRONS Loew. 



(Fig. 32.) 



Heteroneura latifrons Loew, Wien. ent. Monats., vol. 4, p. 83 (1860); Berl. ent. Zts., 

 vol. 7, p. 207; Cent. 4, 93 (1863).— Czerny, Wien. ent. Ztg., vol.22, p. 99 (1903). 



Heteromenngia latifrons Johnson, Fsyche, vol. 20, p. 99 (1913).— Malloch, Proc. 

 Ent. Soc. Wash., vol. 20, p. 8 (1918). 



Testaceous, lower part of head and thorax flavous; arista black, 

 two and one-half times length of antenna, relatively long-plumose, 

 buccal hairs vestigial, bristles strong and black; cheeks one-sixth 

 eye-height, front square. Sides of mesonotum including the humeri 

 brown, metapleurae brown, two pairs of lateral setae on scutellum, 



