24 . PROCEEDINGS OF THE NATIONAL MUSEUM vol 73 



BELVOSIA VITTATA, new species 



Male. — Front 0.36 of the head width at vertex, widening from about 

 the level of the front ocellus. Frontal bristles in about three irregu- 

 lar rows, the parafrontals with changeable dark pollen almost tessel- 

 lated in effect; the outer and upper portion shining black. Face, 

 cheeks, and posterior orbit white pollinose with satiny reflection; below 

 the frontal bristles there are only one or two black hairs. Cheek with 

 fine brown hairs. Antennae dark red, the third joint very long, seven 

 or eight times the second, black all along the front margin and about 

 the apex. Arista broken off. Vibrissae quite close to the mouth, the 

 distance being as usual about equal to the second antennal joint. 

 Facial ridges not very prominent, with sparse stout bristles extending 

 slightly above the middle. 



Thorax black, the pollen distinct so as to leave four black stripes 

 very plainly visible to the naked eye and reaching ahnost to the scu- 

 tellum, which is black with gray pollen. Stemopleurals 3; scutellum 

 with scars of five stout lateral bristles, no differentiated apicals and 

 three pairs of «raall discals. 



Abdomen black, with changeable gray pollen on the basal part of 

 the second segment, which is not distinctly lunited; the third segment 

 is yellowish gray pollinose on about the basal half, narrowly inter- 

 rupted in the middle and extending on the venter; the fourth segment 

 is covered with dense rather light-yellow pollen to the apex, but with 

 a narrow median black shining stripe. The first segment has no 

 median marginals, the second a single pair, the third a marginal row, 

 the fourth a sparse submarginal row of six or eight. 



Wings brownish, the calypters whitish-yellow, in the center a little 

 infuscated. 



Legs black, front ones missing; hind tibia with cilia in a single 

 dense, even row with one stronger bristle at three-fifths the length. 



Length, 11 mm. 



Described from one male, Sapucay, Paraguay, taken May 24, 1902, 

 by an unknown collector. 



T^/pe.— Male, Cat. No. 40469, U.S.N.M. 



BELVOSIA FRONTALIS, new sp«cies 



IfaZe.— Front 0.36 to 0.38 of the head width at vertex, the sides 

 diverging quite rapidly. Face white pollinose, a distmct shade of 

 light yellow in the dense pollen of the parafacial, cheek, and posterior 

 orbit; parafrontals with thin yellowish pollen through which the 

 light ground color shows considerably. In the type there is a sharp 

 line of division just above the lowest frontal, above which the pollen 

 is more distinctly yellow; but in the paratype this line of division is 

 barely perceptible. Antennae deep reddish-yellow, the third joint 

 four times the second. Vibrissae rather close to the oral margin. 



