502 bulletin: museum of comparative zoology. 



clypeus, anterior borders of cheeks, antennae, and legs light red or 

 even yellowish. The last funicular joint, femora, and tibiae are often 

 darker, except at the articulations. In some specimens the femora are 

 blackish, with the knees, tibiae and tarsi reddish yellow. 



Female. Length 8-10.5 mm. 



Resembling the worker in color and pubescence, except that the 

 body is darker and less silvery. Differing from the female of all the 

 preceding forms of fusca in having the wings colorless or very faintly 

 tinged with yellow near the anterior border, veins yellow, stigma brown. 



Male. Length 9-10 mm. 



Differing from the male of the preceding forms in having colorless 

 wings and in the color of the body. The head and thorax are black 

 or dark brown, the gaster sometimes paler. Legs, genitalia, antennae, 

 and mandibles clear yellow. 



Type locality.— Illinois: Rockford, (Wheeler). 



Illinois : Algonquin (W. A. Nason) ; Galesburg (Centr. Exp. Farms 

 Coll.). 



Washington: Yakima River (S. Henshaw). 



Oregon: Corvallis, The Dallas (Amer. Mus. Nat. Hist. Coll.). 



California: Palo Alto (H. Heath); Corte Madera Creek (W. M. 

 Mann); Harris, Humboldt Co. (J. C. Bradley). 



Arizona: Coconino Forest, Grand Canyon, 7,000 ft., Williams, 

 7,000 ft. (Wheeler); Miller Canyon, Huachuca Mountains (H. A. 

 Wenzel). 



New Mexico: Gallinas Canyon, Pecos (T. D. A. Cockerell); Man- 

 zanares (Miss Mary Cooper); Las Vegas (Wheeler). 



Montana: Helena (W. M. Mann). 



Colorado: Colorado Springs, Colorado City, Florissant, Buena 

 Vista, Sali'da, Pike's Peak, 10,000-11,000 ft. (Wheeler); Troublesome, 

 Boulder (S. A. Rohwer); Salina (T. D. A. Cockerell). 



South Dakota: Pierre (S. S. Visher). 



Utah: East Mill Creek, Willow Canyon (R. V. Chamberlin). 



Kansas: Lawrence. 



Michigan: Porcupine Mountains (O. McCreary); Isle Royale 

 (Gleason); Marquette (M. Downing). 



New Hampshire: Durham, White Mountains (W. F. Fiske). 



Massachusetts: Ellis\alle, Annisquam (Wheeler); Cotuit, Woods 

 Hole (Miss A. M. Fielde). 



British Columbia: Loon Lake, Spillimacheen River, Selkirk Moun- 

 tains (J. C. Bradley). 



This variety, which in its pure form is readily distinguished by the 

 beautiful silvery pubescence and pale legs and antennae of the worker 



