ART. 8 REVISION OF THE FLY GENUS BELVOSIA ALDRICH 43 



large suberect bristles on the outer side on the upper half, the lower 

 half with uniform row of smaller bristles. All these bristles stand 

 along the outer side of some more depressed hairlike ones. 



Wings rather light brown in color, narrow toward the apex, bend of 

 fourth vein rectangular but rounded, a little nearer the margin of the 

 wing than usual ; base of third vein with three or four hairs. 



Length, 11.5 mm. 



Redescribed from a male specimen received from the Vienna Nat- 

 ural History Museum, which is apparently one of those which Wiede- 

 mann had before him when he redescribed esuriens. It is from Brazil, 

 labeled " Coll. Winthem." and bears the small, square, red tag without 

 writing which Brauer says indicates Wiedemann's original specimen. 

 Wiedemann erroneously calls this specimen a female. Four addi- 

 tional specimens of this species, a male and three females, have been 

 received from the American Museum of Natural History; they were 

 collected at Chapada, Brazil, by H. H. Smith. The male has a longer 

 third antennal joint and a narrower band on the third abdominal 

 segment than the Vienna specimen, but the females are like the latter. 



BELVOSIA WILLIAMSI, new specie. 



Male. — Front at vertex 0.28 to 0.30 of head width, widening very 

 slowly for a short distance. Parafrontals almost black except for a 

 short distance anteriorly, where they are gray. Frontals in two irregu- 

 lar rows. Face, paraf acials, cheeks, and orbits silvery white, the hairs 

 below lowest frontals are black. Cheek with fine hairs which show a 

 slightly reddish reflection. Antennae brown at base, third joint 

 black, twice as long as the second. Facial ridges bristly to a little 

 below the arista. Palpi yellow; beard white. 



Thorax black, subshining, with a little gray pollen in front; scu- 

 tellum more shining brown. 



Abdomen shining black on the first two segments, the second with 

 a faint trace of a basal pollinose line; third segment with a basal 

 interrupted pale yellow crossband covering approximately one-half 

 of the segment in the most favorable viewpoint, the remainder of the 

 segment shining black; fourth segment with dense yellow pollen on 

 the basal three-fourths, narrowly interrupted on the middle line; 

 first and second segments with a single pair of median marginals; 

 third and fourth with a marginal row. 



Legs black, front pulvilli greatly enlarged, a little longer than the 

 last two tarsal joints. Hind tibia rather evenly ciliated on the outer 

 side with the usual larger bristle below the middle. 



Length, 10.5-12 mm. 



Described from three males. The type is from Campinas, Brazil, 

 March, 1924 (F. X.Williams); one from Brazil without further dat4; 

 the other, received from C. H. Curran, is from Kartabo, British 

 Guiana, 1924. 



