AMERICAN DIPTERA. 169 



covered with a light brown bloom. Abdomen dark brown, first seg- 

 ment and posterior margins of the following segments whitish pruinose; 

 empodia present. 



Face white pruinose with mystax of same color: occiput and vertex 

 thinly grayish pruinose; proboscis black. Antennae (PI. IV, fig. 10), 

 yellowish, darker toward tips; third segment short, about equaling the 

 style; both the third segment and the style clothed with sparse but 

 distinct outstanding microscopic hair. Thorax polished black, every- 

 where thinly white pruinose except on the mesonotum, where the 

 bloom is light brown; the median stripe geminate, and the more 

 obscure lateral stripes very broad. Abdomen polished, dark brown; 

 the first segment and the posterior margins of the following segments 

 whitish pruinose; venter whitish pruinose. The female abdomen is 

 strikingly swollen distally as in annulatus. Legs whitish; front femora 

 somewhat yellow toward tip, the apical third of hind femora greatly 

 incrassate, dark brown, with fulvous subapical ring which in some 

 cases extends to the apex. Hind tibiae gradually incrassate, basal 

 third whitish like base of the femora, apical two-thirds dark brown 

 with a more or less prominent testaceous median ring. Tarsal segments 

 whitish, their apices brown. Halteres polished black, peduncle whitish. 

 Empodia present, claws black. Wings pure hyaline, violaceous, veins 

 polished black; second posterior cell not elongate, the base obliquely 

 truncate with the base of the second submarginal cell opposite; fourth 

 posterior cell sessile or subsessile, occasionally with a pronounced 

 peduncle. 



Type. — M. C. Z. One male type of pictipes, and one female 

 type of varipes. 



Habitat.— m. (type); L. I. (Aug. 2), N. Y.; Clementon (May 

 30), Atco (June 4 and 18), Dunnfield (July 12) and Riverton 

 (July 7), C. W. Johnson, N. J.; Pa. (June 17, July 5, Sept. S, 

 E. Daecke); Md. ; D. C. ; Va. ; N. C. ; Ga.; Ala.; Huachuca 

 Mts., Ariz. (H. Skinner); Vera Cruz, Mexico. 



Described from twelve specimens including the type. Many 

 specimens have antennae very dark and a yellowish cast to 

 the pruinose bands of the abdomen, and the legs are often 

 yellowish. It is readily distinguished from annulatus , which 

 it closely resembles, by the bands of the legs and the presence 

 of empodia. 



Leptogaster scapiilaris. 



Leptogaster scapularis Bigot, Annales, 1878., 444. 

 Length 14 mm. — Nigro fusco, pleuris scapulisque late rubidis; an- 

 tennes nigris, base fulvis; facie et mystace albidis; halteribus fuscis; 



TRANS. AM. ENT. SOC, XXXV. (22) MAY, 1909. 



