1895. PB0CEEDING8 OF THE NATIONAL MVSEUM. 401 



four dark-brownisli vittiB, almost destitute of pile, the bristles black- 

 pleura black, sometimes partly yellowish, bluish gray pollinose. pile 

 iu frout of halteres black ; scutellum black, gray pollinose, bear- 

 ing two bristles. Abdomen compressed, shining, black j the broad 

 hind margin of each segment laterally yellow, sometimes extending to 

 the anterior edges of the segment, dividing the black color into three 

 vittas medio-dorsal and lateral; pile of abdomen sparse, black; venter 

 yellow; hypopyginm rather large, ascending, abundant black pilose, 

 middle lamelhie yellow, broadening to the tip; iilamcnt very thick at 

 base, then suddenly attenuated and bristle-like, arcuate. Legs, includ- 

 ing the coxne, light yellow; apical half of front tibi* and extreme apex 

 of the others, front tarsi wholly, apex of iirst two joints and the whole 

 of the remaining joints on the middle and hind tarsi, usually but not 

 always dark brown ; all tibiie and tarsi furnished with numerous long 

 bhick pile; on the under side of each hind femur before its apex is an 

 irregular, three-pronged process, and on the inner side of each hind tibia 

 near its base are two processes, one behind the other; just before the 

 basal process the tibia is hollowed out; front metatarsi nearly twice as 

 long and three times as thick as the middle ones, hind metatarsi one- 

 half thicker and one-third longer than the middle ones. Knob of hal- 

 teres light yellow. Wings dark gray, stigma slightly darker, veins 

 dark brown. 



Female. — Like the male, except that the hind femora and tibiae are 

 destitute of processes, the front metatarsi are not thicker than the 

 middle ones, while the hind metatarsi are much thicker than and fully 

 as long as the front ones; abdomen tapering to the apex. 



Types.— Nos. 3163 and 31G1, U.S.N.M.; length, G to 7 mm. Five 

 males and five females were received from Mr. Charles Eobertson and 

 Prof. H. E. Weed. 



Locality. — Illinois and Ohio. 



EMPIS CLAUSA, new species. 



Male. — Head black, subshining, eyes contiguous, upper facets much 

 larger than the lower ones; antennte black, the third joint quite short, 

 rather broad at base; style two-thirds as long as the third joint; pro- 

 boscis two and one-half to four times as long as height of head, palpi 

 brown. Thorax, iDleura, and scutellum black, opaque, gray pollinose, 

 pile in front of halteres black; scutellum bearing two bristles. Abdo- 

 men black, su.bshining, toward the base more or less tinged with yel- 

 lowish, its pile black; hypopygium very small, porrect; filament slender, 

 yellow, hidden except on basal half. Legs simple, slender, the middle 

 and hind femora and all the tibiae furnished with many very long black 

 pile; coxoe yellow, the hind ones brown; femora yellow, the hind ones, 

 except at base, blackish ; tibiae and tarsi blackish, extreme base of each 

 tibia 5'ellowish; hind tibiae greatly dilated toward the tip, bowing 

 inward at the middle; front metatarsi nearly t^vice as thick as the 

 Proc. N. M. 95 20 



