S PEOCEEDINGS OF THE NATIONAL MUSEUM vol.76 



ties hardly extending to base of antennae, the two uppermost pairs 

 larger than the median ones and cruciate near base, the anterior bris- 

 tles very weak, the pair above these fully as strong as the vibrissae, 

 horiaontal, cruciate at middle ; ocellars very minute, proclinate ; orbi- 

 tals none ; inner verticals well developed, erect, cruciate near tip, the 

 outer ones hairlike; parafacials gray pollinose, with a few short in- 

 conspicuous hairs above, at narrowest point about two-thirds the 

 width of third antennal joint; face shallow, not keeled; ridges rather 

 flattened, with a few bristles above vibrissae, which are situated about 

 on level with oral margin; antennae slightly shorter than the face, 

 yellowish, infuscated apically, third joint about two and one-half 

 times the length of second; arista of moderate length, yellowish, 

 slightly thickened at base, with long hairs above extending from base 

 to tip, beneath bare at the base with shorter hairs beyond extending 

 to tip, penultimate joint broader than long; proboscis short, fleshy, 

 labella large ; palpi blackish, rather short, the slightly thickened apex 

 bearing a few short bristles ; cheeks one-fifth the eye height, thinly 

 gray pollinose, with numerous black hairs below; occiput gray pol- 

 linose, practically bare above, with sparse black and pale hairs below ; 

 posterior orbits gray pollinose, reduced to a line on either side of 

 vertex ; eyes bare. 



Thorax and scutellum black, with gray pollen ; (the mesonotum dis- 

 colored, doi-sal stripes probably distinct). Chaetotaxy: Humeral 3 

 (the inner one small) ; posthumeral 1 ; notopleural 2; pteropleural 0; 

 presutural 2 (outer large, inner small) ; acrostichal 1, ? (obscured by 

 pin) ; dorsocentral 2, 3; sternopleural 2; scutellum Avith two pairs of 

 laterals, the posterior ones broken off but evidently large and divari- 

 cate; the apical pair also broken off but the large scars indicating 

 strong bristles; a pair of rather weak preapical and discal bristles 

 present, the latter wide spaced on disk which bears a number of erect 

 .fine hairs on basal margin; postscutellum very small; posterior 

 calypters brown, anterior ones white; infrasquamal hairs present; 

 halteres brownish. 



Abdomen black, with gray pollen extending over broad bases of seg- 

 ments 2 to 4 except on a very narrow dark median stripe, viewed 

 from behind the pollen is changeable and has a distinct brownish 

 tinge; first segment without median marginal bristles; intermediate 

 segments each with a pair of discal and a marginal row ; fourth with 

 a marginal row and irregular placed discals ; genital segments black, 

 small; outer forceps lobelike, black basally, tips yellowish, broadly 

 rounded; inner forceps widely divergent, moderately broad at base 

 tapering to rather sharp tips which are yellowish, otherwise black; 

 fifth sternite normal, with a rather shallow broad V-shaped incision, 

 lobes bearing numerous fine black hairs. 



