8 PROCEEDINGS OP THE NATIONAL MUSEUM vol.73 



Legs black, claws and pul villi yellow; hind tibia with six or eight 

 suberect bristles on the outer side, just behind which are numerous 

 sloping cilia. 



Wings dark brown, bend of fourth vein rather close to margin, the 

 distance about half of that between hind cross vein and bend. Both 

 calypters blackish. 



Length, 15.5 mm. 



Described from one female collected at Ixiamas, Bolivia, in Decem- 

 ber, 1921, by Dr. W. M. Mann, while director of the Mulford 

 Biological Exploration. 



2V^e.— Female, Cat. No. 40474, U.S.N.M. 



BELVOSIA AUSTRALIS, new species 



Female.— Front 0.35 of the head width at level of the front ocel- 

 lus, widening rapidly below; parafrontals with thin plumbeous pollen, 

 having a blackish appearance in some directions but not actually 

 shining. The frontal bristles mostly in a single row except three 

 pairs of proclinate orbitals. The hairs below the frontals are rather 

 numerous and distinctly black. Face, parafacial, and cheek shining 

 white pollinose, almost silvery; vibrissae not so far above the mouth 

 as in most species, the distance being somewhat less than the length 

 of the second antennal joint; facial ridges bristly to the middle; 

 antennae blackish, third joint one and a half times the second! 

 Palpi yellow, rather large and swollen; beard white. 



Thorax black with gray pollen, that of scutellum dark brown. 



Abdomen wholly black, the last two segments rather shining, the 

 first with two pairs of median marginals, the second with a complete 

 marginal row of about 20, the third with a marginal row of 14, the 

 fourth more shining black than in the preceding, with a submarginal 

 row of smaller bristles, about 14 in number. 



Legs black, claws and pulvilh yellow, the hind tibia with a rather 

 even row of sloping small bristles or stout cilia, about 25 in number, 

 one below the middle somewhat larger. 



Wings dark brown; both calypters blackish. 



Length, 11 mm. 



Described from one female, Eio Grande do Sul, Brazil, from the 

 collection of C. W. Johnson, to whom the specimen has been returned. 



BELVOSIA VANDERWULPI Williston 



Belvosiavanderwulpi Williston, Trans. Amer. Ent. Soc, vol. 13, 1886, p. 303. 



Female (type) .—Vertex 0.30 of head width. Head with brown 



pollen throughout except the facial ridges and an mdefinite spot on 



the lower part of the parafacial; the facial ridges contrast strongly in 



color with the face, they being of a dull silvery or slightly plumbeous 



