40 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 78 



Legs black, coxae with strong curved bristles or spines. Hind tibia 

 with a row of erect bristles of increasing size ending just before the 

 middle; rather numerous small hairs and bristles extending all the 

 way to the tip. 



Wings brown, both calypters deeply infuscated. 



Length, 14-15 mm. 



Described from four females ; two, including the type, were collected 

 at Puerto Barrios, Guatemala, March 5, 1905, by Prof. Jas. S. Hine, 

 from whom they were received; another was collected in Brazil by 

 H. H. Smith and was received from the American Museum of Natural 

 History; the fourth is in the collection of the Vienna Museum, labeled 

 "Schott. Brasilien," and "Willistonia det. B. B." This last has but 

 three marginals on the second abdominal segment, but agrees in other 

 characters, especially in the dense spines of the middle ventral region. 



Type.— Female, Cat. No. 40471, U.S.N.M. 



BELVOSIA SMITHI, new species 



Male. — Front rather narrow, 0.30 to 0.32 of the head width, the 

 narrow space continuing a little in advance of the ocelli, thence rap- 

 idly widening. Frontal bristles in three irregular rows, the outer not 

 very strong. Parafrontals with thin somewhat plumbeous pollen. 

 Face, paraf acial] and cheek with shining white pollen, the last with 

 yellowish brown hairs which in certain lights look pale; a few dark 

 hairs below the frontals on the parafacial, but these are not quite 

 black in some lights. Facial ridges bristly more than halfway. Third 

 antennal joint black, noticeably tapering toward the tip, twice as long 

 as the second; the first and second joints yellowish brown. Vibrissae 

 almost half the length of third joint above the oral margin; palpi 

 yellow; beard white. 



Thorax black, brownish along the sides, with gray pollen, that of 

 the scutellum more brown. 



Abdomen subshining black, the third segment with a narrow and 

 sometimes faint interrupted pale pollinose band at extreme base ; fourth 

 segment pale yellow pollinose, except the apex including the bristles 

 and a distinct median black line; the pale pollinose portion has a few 

 erect hairs rather large on the sides and the black of the apex expands 

 underneath to include the whole width of the segment; in other words, 

 the pale pollen does not extend much below the middle of the side of 

 the segment; first and second segments with a single pair of median 

 marginal bristles. The venter has rather striking soft black hair 

 which is dense on the second and third segments, but does not form 

 distinct patches. Genitalia blackish, outer forceps somewhat paler, 

 not distinctly swollen. 



Legs black, front claws and pulvilli much elongated, the latter as 

 long as the last two tarsal joints. Hind tibia with dense ciliation in 

 several rows. 



