ABT.8 REVISION OF THE FLY GENUS BELVOSIA ALDRIOH 41 



Wings uniformly brown, rather long and narrow. Bend of fourth 

 vein rather close to hind margin, the distance being about half of that 

 between the hind crossvein and the bend. Both calypters brown. 



Length, 14-15 mm. 



Female. — Front at vertex 0.36 of the head width; pollen of head as in 

 male. Antennae slightly shorter, the third joint little enlarged at 

 base, of more uniform width. Hairs of cheek and upper parafacial 

 decidedly black. CUiation of hind tibia rather coarser and more 

 bristly than in the male. 



Length, 12 mm. 



Described from two males and one female, collected at Chapada, 

 Brazil, by H. H. Smith. Sent for identification by the American 

 Museum of Natural History. The male paratype is retained by the 

 National Museum. 



Named in honor of the late H. H. Smith, a wonderfully capable 

 and energetic collector of insects. 



Paratyjpe.—M2lQ, Cat. No. 40479, U.S.N.M. 



BELVOSIA SPINICOXA. new speciei 



Male. — Front rather narrow at vertex, measuring 0.34 to 0.37 of the 

 head width; the sides above subparallel for a short distance; para- 

 frontals shining brownish-black, more poUinose adjacent to the frontal 

 stripe. Frontal bristles in two or more irregular rows, a few black 

 hairs below the lowest ones; parafacials pure glistening white ; face 

 and cheeks of the same color. Vibrissae a little higher above the 

 mouth than in most of the species, almost as in hicincta. Antennae 

 black, second joint brown, the third a little over twice the second, 

 considerably swollen at the base near the arista, which tapers evenly 

 to its apex. Facial ridges moderately prominent, bearing small 

 bristles a little more than half way to the base of the antennae. 

 Palpi yellow. 



Thorax black with the usual pale pollen anteriorly. The scutellum 

 brown in ground color and with brownish pollen. 



Abdomen black in ground color; base of second segment with a very 

 narrow pale fascia, broadly interrupted in the middle; second seg- 

 ment densely yellowish white pollinose on the basal half or more^ 

 gradually fading out posteriorly; fourth segment densely pollinose 

 with light yellow except rather broad apical black portion iucluding 

 the marginal bristles, the light yellow part destitute of hairs. The 

 first and second segments have one pair of marginal bristles, the third 

 and fourth a marginal row. 



Legs black, front pulvilli nearly as long as last two tarsal joints. 

 Hind tibia with several rather striking suberect stiff bristles on the 

 outer hind side in addition to numerous smaller and more sloping 

 bristles and hairs. 



