NO.12S0. N_E]v NORTH AMERICAN DIPTERA—COQVILLETT. 115 



long as the second, arista j^ellow at base, thickened on the basal fourth, 

 mouth parts yellow; thorax and scutelluui blatk, thinly whitish prui- 

 nose, the mesonotum with three broad black vittffi, two sternopleural 

 bristles, scutelluni bearing- three marginal pairs, the last one very 

 small and diverging; abdomen polished, reddish j^ellow, a dorsal sub- 

 triangular l)rownish spot extends over the first two segments, very 

 short marginal bristles on the last three segments; coxtB and femora 

 reddish yellow, tibife dark brown, tarsi black; wings from base to 

 apex of anal cell, and from slightly beyond humeral crossvein 

 obliquely almost to middle of discal section of fifth vein, yellow, 

 behind fifth vein and along the apex gray, remainder brown except an 

 oblique whitish hyaline fascia almost crossing the wing beyond the 

 hind crossvein; first posterior cell closed, its petiole less than half as 

 long as the hind crossvein; calypteres yellow; length, -1.5 mm. A 

 female specimen.- 



Ilahltat. —Texas. 



Type.—i^^i. No. 6321, U.S.N.M.^ 



MUSCOPTERYX TIBIALIS, new species. 



Black, the palpi, tibi;v, and second antennal joint of female yellow, 

 cheeks and lower part of face reddish I)rown; vertex of male one-third, 

 in the female as wide as either eye, sides of face bearing three or four 

 irregular rows of rather long bristly hairs of nearl}^ an equal length, 

 thorax subopaque, gray pruinose and with four black vittfe, scutellum 

 bearing three marginal pairs of bristles, the last one cruciate, only 

 slightly shorter than the first; abdomen somewhat polished, light 

 grayish praiiiose and with reflecting darker spots; wings hyaline, 

 tinged with brownish toward the base, third vein bearing two bristles 

 near the base, bend of fourth vein angular and with a short stump of 

 a vein, the vein strongly bent inward be3^ond the bend; calypteres 

 whitish; length, 7 to 9 mm. A specimen of each sex collected April 

 23, 1898, by Prof. J. M. Aldrich. 



Habitat. — Moscow and Julietta, Idaho. 



7)/pe.— Cat. No. 6223, U.S.N.M. 



' Chsetolyga nigrifacies Bigot. Dr. F. Brauer has examined the type of this species 

 and reports that it belongs to the genus Pelmaiomyia or Parexorisia. The species 

 referred to it in my Revision of the Tachinida?, page 125, will therefore require a new 

 name, for which antennalis is proposed; the specimen is a female, black, the sides of 

 the second abdominal segment, hind angles of the first and front angles of the third 

 yellow, antennae as long as the face, the third joint over three times as long as 

 the second, front tarsi noticeably dilated, third vein bearing a single bristle near tiie 

 base. 



r///>t'.— Cat. No. 6222, U.S.N.JVI. 



