NORTH AMKRICAX DIPTEUA. 107 



■•:ntli.v|»rosoi>a potiolata ... s,.. f.-Eyes very dark brow.,, fro.ital 

 v.tta reddish brow.., sides of front silvery with a slight brassy tinge sides of 

 face and facial dep.ession silvery white, facial .idjjes brownish yellow cheeks 

 mostly h.-ow.., so.newhat silvery; anterior pair of ocellar b.'istles stron'<rest di- 

 rected forward a..d strcgly outwa.-d : anten.is brownish yellow, seco.ul joi.it 

 with a pair of bristles on front edge, arista dark brown; p.-obo.scis brownish 

 labella reddish brown, palpi pale yellowish ; occipnt silvery, black-bristly Tho- 

 rax s.lveiy ci..ereons, with a median pair of da.ker vittse, which become ob- 

 solete near the transve.se snture : .scutellum brow..ish yellow, si Ive.-y pollinose 

 Abdomen silvery cinereous, the posterior margi.is of segments brownish g.-ay • 

 first and second segments with a lateral macrochieta, the second also with a me- 

 dian n.a.-g.nal pair, third with about eight marginal, anal with about eight ma.- 

 g.nal, and s..x d.scal .uac-ocheetse. Legs brownish yellow, the femo.-a blackish 

 basally. ta.-s. black, fe.no.-a and tibije bri.stly ; pulvilli very small, whitish 

 Wi.igs grayish hyaline, tegulse white, halte.-es yellowish b.wn. Length of 

 body 6.5 — 7 mm. ; of wing 5—5.5 m.n. 



Described from four specimens; Las Cruces, N. Mex. September 

 17th to 3()tli. ^ 



PSEUD ATKACTOCERA n. gen 



Medium sized to small species, with somewhat the facies of Neo- 

 tractocera, more so of Eathyprosopa. Differs from Neotradoce^-a as 

 follows: Head quadrilateral in profile, facial and frontal profiles 

 more nearly equal; front only a little prominent, in % about one- 

 fourth width of head at vertex and one-third before, in $ about 

 one-third at vertex; frontal bristles in a single row descending only 

 to base of third antennal joint, decussate, vertical bristles a little 

 longer; two orbital bristles in ? , none in % . Face shorter, reced- 

 ing, epistoma not prominent, facial depression one-half or more width 

 of face, wider below, elongate-oval in outline, not deep, with a me- 

 dian carina, which becomes obsolete below; facial ridges bare, except 

 some bristles above vibrisste, but little constricted below, sides of 

 face rather wide, or only moderately so, bare; cheeks .>^omewhat less 

 than one-half eye-hight, bristly below and posteriorly; vibrissa^ 

 rather strong, decussate, inserted somewhat above oral maroin. An- 

 tennae much shorter than face, second joint quite elongate, third a 

 little more than twice as long as second, very narrow, ralher pointed 

 at tip; arista thickened on basal third or fourth, rather bulbous 

 bare. 8-jointed, second joint short. Proboscis short, palpi slender! 

 slightly thickened at tip; scutellum with an a|)ical, more or less de- 

 cussate pair of macrochajtje rather exceeding middle of .•second ab- 

 <lominal segment, three lateral and a weak discal pair. Abdomen 

 hardly wider than thorax, oval, first .segment hardiv shortened ; claws 

 and pulvilli of % elongate, of 9 considerably shorter. Wiugs 



TR.INS. AM. ENT. SOC. XIX. ^j^Y jgg.. 



