AMERICAN DIPTERA. 327 



white pile and black bristles, except on the posterior side where the 

 bristles are white; middle tibiae white, pilose before the middle, below 

 marked with a brush of dense black pile and then on both sides black- 

 pilose; armed on the posterior side with white bristles, on the anterior 

 side with black or black and white bristles; all the bristles of the hind 

 tibiffi and the pile for the most part black. Tarsi reddish; the ex- 

 treme apices of the several segments darker, the last segment almost 

 wholly black; the bristles of the tarsi black, of the front metatarsi in 

 part white; the pile of the tarsi black, but that of the front metatarsi 

 above dense and white. Halteres yellowish. The anterior half of 

 the wings hyaline, the lowermost base as far as the humeral vein, 

 black, the apical half black; the base of the first submarginal cell, 

 the apex of the first basal and of the discal cells and the fourth and 

 fifth at base darkened, the transverse veins enveloped in a deeper 

 black color. 



$. — Like the male, but covered with somewhat shorter pile over 

 the whole body; the middle femora below near the apex have no black 

 spines, the middle tibise lack the brush of black bristles and pile, and 

 are wholly clothed with white pile; the white pile of the front meta- 

 tarsi is shorter and much more sparse. 



Type. — M. C. Z. Type series consists of two male and one 

 female specimens. 



Habitat. — Texas (type, Belfrage). 



The above is a liberal translation from Loew with the in- 

 sects before me. The white pile of the male abdomen is most 

 dense and long on the sides of segments 1-3, and on the venter 

 of the same; from thence on shorter and confined almost 

 exclusively to the venter. The posterior angles of segments 

 2-4, and all the other segments with the same short reddish 

 pile as found on the hypopygium. 



Heteropogoii rubidiis. 



Anisopogon rubidus Coquillett, Can. Ent., XXV, 21, 1893. 

 " (^ 9- — Length 14-17 mm. — Obscure brown; the following parts 

 black: the third antennal segment, basal half of style, proboscis, 

 palpi, scutellum except its base, first segment of abdomen, basal half 

 of second, lateral margins of the others, seventh segment and genitalia 

 largely, apex of venter and upper side of each femur, that on the first 

 and second segments of abdomen with a strong bluish tinge, brown of 

 abdomen more reddish than on other parts; thorax irregularly marked 

 with grayish-black. Head gray pruinose, the pile yellowish-white; 

 face evenly convex, the pile extending nearly to base of antennae; 

 first segment of antennae slightly longer than the second; third seg- 

 ment slightly longer than the first two taken together, tapering grad- 



TR.\NS. AM. ENT. SOC. , XXXV. AUGUST, 1909 



