472 PROCEEDINGS OF THE NATIONAL MUSEUM: vol.43. 



APHIOCRSTA EVASTH^E, new species. 



Male and female. — Yellow; frons black, bristles strong, the lower 

 post-anteimal pair nearly as large as the strong upper pair, antennae 

 black-brown, arista paler, long and indistinctly pubescent; palpi 

 yellow, moderate in size, but with six to seven very long bristles; 

 thorax yellow with a brownish tinge, two scutellar bristles ; abdomen 

 brown in female with paler hind margins; in male, black-brown, with 

 very indistinct paler hind margins to segments; segments subequal, 

 anal protuberance small, yellow; legs yellow, hind femora slightly 

 dusky at apices ; hind tibiae very delicately setulose ; wings yellowish ; 

 costa to middle, first division rather more than one and one-half times 

 as long as second, fringe very long and strong, fourth vein leaving 

 third at beyond fork, nearly straight, and ending distinctly in front 

 of wing tip ; hal teres whitish yellow. 



Length, 1^-2 mm. 



Type.— C&t. No. 14859, U.S.N.M. 



Four specimens labeled ''Bred from Evarthus ovatus" (Coleoptera) 

 June 28, 1897. No locality label. There are also seven specimens 

 labeled "Bred from a dead PolypTiylla^' Detroit, August. These 

 latter are darker in color of thorax and pleurae, but quite evidently 

 are the same species. The very long costal bristles and pale halteres 

 distinguish this species readily, though in some cases the costa looks 

 as if it hardly reached the wing middle, and sometimes the thorax 

 is brownish, though the insect is readily recognized as a ^ yellow 

 species by its pale pleurae and the very pale legs and coxae. (See 

 in section with bare mesopleura under "thorax black or brown.") 



APmOCH^ffiTA STRAMINEA, new species. 



Male and female. — Yellow; frons black or brown, upper pair of 

 post-antennal bristles large, lower pair about one-fourth as large as 

 upper, antennae small, spherical, clear yellow, arista brown, about 

 one and one-half times as long as length of frons, pubescent; palpi 

 yellow, normal; thorax yellow, pleurae paler in color, scutellum with 

 two bristles; abdomen yellow, more or less suffused with brown; 

 several small bristles on lateral margins of second segment; legs 

 and coxae very pale yellow; several long curled hairs on basal half 

 of ventral surface of hind femora. Sometimes the apex of hind 

 femora is dusky; hind tibial setulas very small and indistinct, only 

 visible under a high power; costa to short of middle of wing in male, 

 to middle in female, first division about twice as long as second, 

 third about one-half as long as second, fourth vein leaving third 

 at beyond fork, with a gradual bend, and ending recurved at much 

 in front of wing tip ; halteres yellow. 



Length, 1-1^ mm. 



