NO.2099. THE DIPTEROUS GENUS SYMPHOROMYIA—ALDRICH. 125 



Abdomen black, with glaucous pollen and long bushy pile, which is 

 yellow at base and on the sides, black on most of the dorsal surface; 

 hypopygium somewhat embedded. 



Coxae and femora black, tibiae and base of tarsi dark yellow; 

 middle coxae with mixed black and yellow hairs, no spine. 



Wings rather pale yellow. 



Length, 7.5 mm. 



Female (cotype redescribed; variations noted below). — Front 

 cinereous, overlaid with brown pollen in the middle, with moderate 

 black pile; Vvddth of front above antenna rather less than that of the 

 eye; first joint of antenna yellowish-brown in ground color, cinereous 

 poUinose, short and hardly swollen, with rather short black hair, that 

 on the lower side slightly reddish; palpi wide toward the tip, dark 

 yellow, ])rown on the bare upper edge before apex, the pile elsewhere 

 mostly pale, but varying to blackish near the tip with the angle of 

 view; proboscis short; labella fleshy; beard whitish. 



Mesonotum and abdomen as in male, but with shorter pile; sixth 

 and following segments brownish-yellow. 



Legs and wings as in the male. 



Length, 6.6 mm. 



Material examined : 



Type male and cotype female, Edge Hill, Philadelphia, lent by 

 C. W. Jolmson. 



3 males, Mouiit Washington, New Hampshire (Slosson) ; 1 male, 

 2 females, Pennsylvania, in the United States National Museum. 



3 females, Pennsylvania (Daecke) ; these have the tibiae dark, in 

 one the hind tibiae quite black, but the middle and front ones are 

 decidedly not black. 



1 female, Ira, Summit County, Ohio (liine); like the dark form 

 just mentioned. 



1 female, Thomasville, Alabama, lent by United States National 

 Museum. 



1 female, Wasatch Mountains, Utah, cotype oi Jiavipaljns Adams, 

 lent by C. W. Johnson; the legs are quite pale, femora deep brown 

 toward base, antennae and palpi rather pale yellow. 



1 female. Emigration Canyon, Utah, in the Wasatch Mountains 

 (A. K. Fisher), is just a shade darker than the preceding. 



6 females, Marshall Pass, Colorado, 10,856 feet, collected by me, 

 are about as dark as Dr. Fisher's specimen. 



8 females, Sedan, Montana (R. A. Cooley, No. 143); they have the 

 femora black except tip, tibiae yellow, antennaer from brown to 

 black, palpi from yellow to black. These are the specimens men- 

 tioned in the introduction as sucking blood. 



5 females, from Spanish City, West Gallatin Canyon, and Gallatin 

 County, Montana, from Professor Cooley. 



