-iRT. 8 REVISION OF THE FLY GENUS BELVOSIA ALDRICH 25 



facial ridges bristly almost to the arista. The hairs on the upper 

 parafacial are black. Cheek with fine pale hairs which look a little 

 darker in some angles. Palpi pure yellow. 



Thorax black, the pollen forming more distinct stripes than in many 

 of the species. Scutellum reddish around the margin, but with gray 

 pollen. 



Abdomen black except the last segment, but somewhat damaged in 

 the type, so that it is impossible to describe the third segment very 

 satisfactorily; the fourth segment with pale yellow pollen to the apex 

 covering its whole surface, which is also sprinkled with sparse but 

 coarse black hairs. First segment without median marginal bristles; 

 second with a single pair; third with the usual marginal row; fourth 

 with a rather sparse row of smaller size. 



Legs black, the front pul villi minute; hind tibia with dense, short 

 cUia in a single row, with one bristle at the lowest third. Wings 

 light brown; calypters pale yellow. 



Length, 10 mm. 



Described from two males collected at Chapada, Brazil (H. H. 

 Smith), received from the American Museum of Natural History. 



Paratype.— Male, Cat. No. 40470, U.S.N.M. 



BELVOSIA ELUSA, new species 



Male. — Front at vertex 0.30 to 0.35 of the head width, not widen- 

 ing for a short distance from the level of the ocelli. Parafrontals with 

 gray pollen below, becoming darker over most of the area. Face, 

 parafacials, cheeks, and posterior orbits white with satiny reflection; 

 the hairs below the frontal bristles and on the cheek are black. 

 Antennae brown, third joint more blackish, a little more than twice 

 the length of the second. Vibrissae about half the length of the sec- 

 ond antennal joint above the oral margin; facial ridges with strong 

 bristles extending to the level of the arista. Palpi yellow. 



Thorax black, the scutellum and posterior part brownish. The 

 cinereous pollen rather dense before the suture, showing four narrow 

 black stripes. 



Abdomen subshining black, the second segment with more or less 

 of a faint basal interrupted band of pale yellow pollen, a similar but 

 much more distinct band on the third segment, which in most angles 

 of view covers about one-half of the segment; fourth segment with 

 pale yellow pollen to the extreme apex, the first and second segments 

 each have one pair of marginal bristles, the third a rather dense row 

 of about 14, the fourth a row of 8 or 10. 



Legs black, front pulvilli minute, shorter than last tarsal joint; 

 hind tibia with a row of more or less coarse cilia. 



Female. — Front at vertex 0.34 to 0.35 of the head width, the w^hit- 

 ish pollen of the anterior part more extended, so that the dark sub- 

 shining portion is restricted to part of the upper half. 



