4 PROCEEDINGS OF THE NATIONAL, MUSEUM. vol.63, 



below. Hypopygiiim small and without visible appendages, except 

 a black central filament. 



Fore coxae yellow, middle and liind ones wholly black; hairs on 

 the coxae yellow. Fore femora a little thickened, yellow on lower 

 half or more, upper part blackish, these colors sharply defined (fig. 

 3) ; their tibiae yellow with six erect, flattened, pale bristles above on 

 basal half, and a row of long hairs on each side of the dorsal sur- 

 face. Fore tarsi wholly black; first two joints short, about as long 

 as wide, first with a stift' bristle above, second with a very long 

 narrow appendage which is not much shorter than the whole tarsus 

 and is fringed with very long hairs; third joint as long as fifth, of 

 about equal thickness throughout and fringed above with about six 

 very long hairs, below with shorter hairs; fourth joint about twice 

 as long as wide, its tip prolonged into a blunt point below, it has 

 three very long hairs above and several shorter hairs below: fifth 

 very slender, with about six very long hairs above and shorter ones 

 below ; claws long, spreading out more than usual. Middle and hind 

 femora yellow, knees blackish. Middle tibiae mostly black or brown, 

 still a little yellow, especially near the base; posterior tibiae yellow 

 with extreme base and tip brown, both with several slender bristles. 

 Middle and hind tarsi wholly black. Calypters, their cilia, and the 

 halteres yellow. 



Wings dark grayish, more brown in front of fifth vein, especialh' 

 along the veins; third and fourth veins parallel, the latter ending in 

 the apex of the wing; last section of fifth vein a little longer than the 

 cross vein ; anal angle rather prominent. 



Female. — ^Wings and body color about as in the male. Face wholly 

 grayish; first antennal joint yellow below, black above; third joint 

 smaller than in the male; arista plain; legs and feet normal; fore 

 coxae black with their inner surface and tips yellow; fore femora 

 black with broadly yellow tips ; middle and hind femora yellow with 

 their upper edge more or less blackened ; all tibiae and tarsi appear 

 black in certain lights, viewed at other angles the tibiae appear a 

 little yellowish ; cilia of the calypters black. 



Described from three males and three females; two males and one 

 female were taken at Healy, June 26; the others at Anchorage. 

 June 15. 



Type.—MoXQ. Cat. No. 25957, U.S.N.M., from Healy. 



In general appearance and the color of the antennae this is- very 

 much like the European species com'pediUis Loew, but that species 

 has no flattened bristles on fore tibiae; the third joint of fore tarsi 

 is somewhat different, and it has no long bristles on third and fourth 

 joints, and the fifth joint is almost wholly bare. I have not seen the 

 European species, but am judging from Doctor Becker's figure and 

 description : the latter is rather meager. 



