38 PROCEEDINGS OP THE NATIONAL MUSEUM VOL.73 



hardly more than a line; fourth segment with dense pale yellow 

 pollen, the apical third black. 



Legs black, front pulvilli slightly longer than last two tarsal joints ; 

 hind tibia on outer side with a row of small, suberect bristles mixed 

 with a few hairs not so bushy in appearance as in many species. 



Wing brown throughout, narrow at apex, bend of fourth vein rec- 

 tangular and rounded, its distance from the hind margin less than 

 half of that to the large crossvein; third vein with two bristles. 



Genitalia smaller than in most of the species, the inner forceps 

 black, closely pressed together near tip and bent forward almost with 

 an angle; outer forceps hardly so long, dark yellow in color, flat and 

 bluntly rounded at tip. 



Female. — The front is not silvery in the female, but covered with 

 rather dense gray pollen through which the dark ground color is 

 slightly visible. 



Length, 10 mm. 



Redescribed from Wiedemann's type specimen which was received 

 for examination from the Vienna Natural History Museum. Oae 

 additional male has been examined from Brazil, sent by C. H. Curran; 

 and there are two females in the National Museum collection from 

 Ypiranga, Sao Paulo, Brazil (Fonseca). 



BELVOSIA NIGRIFRONS. new species 



Female. — Front rather broad, measuring at vertex 0.38 of the head 

 width (the same in two specimens, the other not in condition to 

 measure), widening rapidly so that the inner border of the eye when 

 viewed from in front is perceptibly concave. Parafrontals shining 

 blackish gray along the inner border next to the frontal stripe, with 

 gray pollen; frontal bristles in a single row, with some rather stout 

 reclinate bristly hairs just outside of them; three or four proclinate 

 orbitals of varying size. Parafacials pure white, shghtly glistening; 

 cheeks and posterior orbits of the same color. The parafacials are a 

 little wider than usual. Vibrissae about the usual distance above the 

 mouth; facial ridges not very prominent, bristly almost to the level 

 of the arista. Antennae black, reddish between the joints, the third 

 joint about twice the second, reaching nearly to the vibrissae. Cheek 

 with black hairs; there are also a few minute black hairs on the 

 parafacial, just below the lowest frontals. 



Thorax black, rather densely gray pollinose along the front border, 

 the scutellum with reddish ground color and brown pollen. 



Abdomen black, first two segments shining; third segment shining 

 on about the apical half, the basal half bearing an interrupted gray 

 fascia, which fades out posteriorly; fourth segment with dense very 

 pale yellow pollen, except the narrow apex bearing the bristles, 

 which is shining black; the pollinose portion is destitute of hairs. 



