NO, 1938. THE DIPTEROUS FAMILY PHORIDM—MALLOCH. 449 



the mid-tarsi which are dusky and the tip of the posterior surface 

 of hind tibia and metatarsi which are glossy black, last four joints 

 of tarsi dusky ; setas on antero-dorsal surface of hind tibia extending 

 to two-thirds of length of tibia, metatarsi not as broad at tibiae. 



Type.—C'Ai. No. 14841, U.S.N.M. 



Two males and two females, Oaxaca, Mexico (Koebele). ''Bred 

 from Neda marginata." N. inarginata Linnaeus is a Brazilian beetle 

 and N. marginalis Mulsant is Mexican. 



It is possible that an error in the name has been made here which 

 can only be determined by an examination of specimens of the host. 



APmOCH^TA LONGIFRONS Brues. 



Yellow ; frons long and narrow, shining, punctured, about twice as 

 long as broad, post-antennal bristles very minute, other bristles large, 

 arranged in lateral rows of four about equidistant at close to the eye 

 margins, and two almost immediately behind and two rather farther 

 in front of the ocelli, which are black; antennae yellow, small, round, 

 half hidden in cavity, arista yellow at base, nearly bare; palpi small, 

 pale yellow, weakly bristled; dorsum of thorax posteriorly narrowly 

 suffused with black extending along the sides to in front of base of 

 wing where it is most distinct and continuing posteriorly in a streak 

 down over the pleurae to behind wing base; scutellum blackened at 

 base, posteriorly pale yellow, four strong bristles present; abdomen 

 yellow, segments 1-4 with lateral triangular black patches con- 

 tinued across on segments 1-3 in a narrowing band, fifth segment 

 yellow, sixth 3^ellow at base, apical four-fifths glossy black, oviposi- 

 tor exserted, glossy black, much as in genus ApocepJidlus Coquillett, 

 mesopleurae bare; legs yellow, tarsi darker, hind femora with apex 

 broadly black, all tibiae with two serial rows of setulae on the antero- 

 and postero-dorsal surfaces, those in the postero-dorsal surface of 

 hind tibia (9-10) very stong; wings narrow, grayish, veins brown, 

 costa to middle, first division rather longer than the other two 

 together, angle at which veins join costa very acute, and cells in- 

 closed by those veins narrow, costal fringe fine, rather short, and close, 

 fourth vein leaving third at fork with a gentle curve and running 

 straight to margin of wing at considerably in front of tip; halteres 

 yellow. 



Length, 3 mm. 



One female, Plummers Island, Maryland, Sept. 8, 1909 (W. L. 

 McAtee). I have also seen 1 male and 1 female from Ithaca, New 

 York (O. A. Johannsen). A close ally of epeirx Brues. Described 

 by Brues from JVIilwaukee, Wisconsin (1906), (male only). The male 

 has the apical third of wing infuscated and in other respects differs 

 somewhat from the description given above. The Milwaukee speci- 

 mens were taken hovering about the burrows of Tremex columha, 

 where Thalessa lunator and T. atrata were ovipositing. 

 48702°— Proc.N.M. vol.43— 12 29 



