ABT. 8 REVISION OF THE FLY GENUS BELVOSIA ALDRICH 7 



Thorax black, with gray pollen in front, becoming brown behind, 

 decidedly so on the scutellum. Sternopleurals variable, from three 



to six. 



Abdomen black subopaque, of uniform color, except on the fourth 

 segment, which has a very striking spot of pale yellow pollen cover- 

 ing the whole upper surface except the apical fifth. This polUnose 

 area bears no small hairs and ends abruptly at the sides. Second 

 segment with 4 to 6 marginals. 



Legs black. Front pulvilli elongated, nearly twice the last tarsal 

 jointr Hind tibia with a row of nearly a dozen bristles of increasing 

 size on the basal two-thirds, a few coarse hairs with these and extend- 

 ing to the tip. 



Wings almost black, fourth vein rather strikingly curved backward 

 at the bend, which is rounded. Calypters blackish. 



Female.— Yront 0.35 of the head width, widening from vertex. 

 Front pulvilli small. 

 Length, 10 mm. 



Redescribed from 1 male specimen collected at Sao Paulo, Brazil 

 (Dr. A. Lutz), and 6 males and 10 females in the Vienna Museum, 

 12 of which are labeled "Beske, Brasilien"; 3 are "Natterer Brasil"; 

 1 simply "Brasilien." Three of these are added to the National 

 Museum collection. The type was a male from Argentina. 



BELVOSIA MANNI, new species 



Female.— A large robust species without pale pollen on the abdomen. 

 Front at vertex 0.38 of the head width, widening immediately from 

 the level of the anterior ocellus. Parafrontals with thin plumbeous 

 pollen, becoming shining in the middle region. Frontal stripes almost 

 black, the frontal bristles in two irregular rows, besides three proclinate 

 orbitals each side, the small hairs below the frontals are black. 

 Parafacials and cheeks with almost white pollen, both very broad, 

 the cheek fully one-half the eye height, with black hairs. Facial 

 ridges with small bristles about halfway up. The vibrissae more 

 than half the length of the third joint above the oral margin. Anten- 

 nae black, the third joint less than twice the second and somewhat 

 protuberant near the arista. Palpi dark yellow; beard white. 



Thorax decidedly black, with thin gray pollen which changes to 

 dark brown on the scutellum. Scutellum with six pairs of long bristles 

 in the described specimen, without any smaller apical suberect pair. 



Abdomen very broad, entirely black, rather dull, without distinct 

 pollen. The first segment with three pairs of marginal bristles, the 

 second with three on one side and two on the other, the third with a 

 marginal row of about 14 ; the fourth with a row of about the same 

 number situated at two-thirds of the length, a few smaller bristles on 

 the extreme apex. 



