16 PKOCEEDINGS OF THE NATIONAL MUSEUM vol.73 



BELVOSIA RECTICOB^aS variety BUFICOBNIS, new 



Male.— Front 0.32 and 0.33 of the head width at vertex, widening 

 but httle for a short distance, then more rapidly. The face and 

 posterior orbit are sHvery white, the facial ridges, parafacials, and 

 cheeks pale yellow poUinose with satiny reflections; parafrontals 

 rather more deeply yellow poUinose, the upper third, however, sub- 

 shmmg and somewhat dark; frontals in three very irregular rows, 

 the hairs below them pale yellow, as are also those of the cheek and 

 a few on the facial ridges outside the bristles. Cheek almost half 

 the eye height; antennae red, the third joint tending to become a 

 little brown in the male, more distinctly so in the female. The third 

 antennal joint two and a half times the second, arista thickened 

 almost to the apex, the tip, however, slender. Palpi yellow; beard 

 white. 



Thorax black, the sides and scutellum obscurely yellowish, the 

 pollen moderately dense in front. 



Abdomen brownish black, second segment with interrupted, basal, 

 light yellow crossband, which in some lights extends almost to the 

 middle of the segment, gradually fading out; third segment with a 

 similar but somewhat more distinct crossband which from some 

 angles covers considerably more than half of the segment; fourth 

 segment covered with dense yellow pollen to the apex; first and 

 second segments with a single pair of median marginals, third with a 

 marginal row, fourth with a submarginal weaker row. The yellow- 

 ish pollen on the second and third segments is distinctly visible 

 underneath and not so changeable as above. 



Legs black; front pulvilli as long as the last two tarsal joints; hind 

 tibia with a row of bristles of increasing size on basal three-fifths, 

 only a few sloping hairs adjacent to these. 



Wings light brown, both calypters pale yellow in color. 

 The pteropleura and adjacent parts bear a considerable cluster of 

 fine, yellow hairs. 

 Length, 10-11 mm. 



Female.— Front 0.37 of the head width, the upper part of the 

 parafrontals subshining, but this region is not sharply limited. 



Described from tliree specimens, Chapada, Brazil (H. H. Smith), 



from the collection of the American Museum of Natural History^ 



and one female from the Vienna Museum, bearing only the label' 



"potens p. p. 266. Coll. Winthem." ' 



Paratype.—M&le, Cat. No. 40475, U.S.N.M. 



BELVOSIA FOSTERI Townsend 



Belvosiomima Josteri Townsend, Proc. U. S. Nat. Mus., vol. 49, 1915, p. 413. 



Male.— Front 0.45 of the head width at vertex; the eyes diverge 



from each other along their inner border very slightly so the face in 



