MOUNTAIN ANTS OF NORTH AMERICA. 525 



8-9 mm. respectively) and quite as large as those of the typical 

 Eurasian form of the species. The worker has the same abundant 

 pubescence and erect hairs on the legs and scapes, but in the female 

 the hairs are less abundant. The ocelli of the worker are very distinct. 

 The body is yellowish brown, with the upper surface of the head, 

 thorax and gaster darker and the appendages a little paler. The 

 wings of the female measure 10-10.5 mm. and are uniformly pale 

 yellowish brown, whereas those of the typical niger are colorless. 

 The male sitkaensis is scarcely smaller than the male niger dark brown 

 and with the wings faintly tinged with the same color. This form 

 passes by gradations into the smaller and darker variety, neoniger 

 Emery and also approaches the true niger and the subspecies alienus. 

 Thus the workers of some of the colonies found at Lake Tahoe and in 

 the Yosemite are much like the European niger, whereas others are 

 smaller and, except for their pilosity, might be confounded with large 

 forms of alicnvs or its variety americanus Emery. 



79. Lasiiis niger var. neoniger Emer;^'. 

 Alberta: Banff (Wheeler). 

 California: Lake Tahoe (Wheeler). 

 South Dakota: Elk Point (C. N. Ainslie). 



Colorado: Broadmoor, near Colorado Springs, Florissant and 

 Salida (Wlieeler); Ward, 9000 ft. and Steamboat Springs (T. D. A. 

 Cockerell). 



New Mexico: Viveash Ranch, 9000 ft. (Cockerell). 



Washington: Pullman (W. M. Mann and R. W. Doane); Union 

 City (J. C. Bradley). 



This variety is also common in cool woods or at higher altitudes 

 throughout the maritime provinces of Canada and the Eastern and 

 Central States as far south as the Black Mts. of North Carolina. The 

 worker and male measures only 2-2.5 mm., the female 6-7 mm. The 

 wings of the female measure 8-9 mm. and both in this sex and the 

 male are clear and hyaline. The body of the worker and female is 

 dark brown or black and the erect hairs on the dorsal surface and on 

 the legs and scapes are abundant and conspicuous. 



80. Lasius niger subsp. alienus Forster var. americanus Emery. 

 Alberta: Banff (.J. C. Bradley). 



British Columbia: Glacier, Field and Emerald Lake (Wheeler); 

 Carbonate (J. C. Bradley). 



Colorado: Denver (E. Bethel); Silverton, 10,000 ft. (E. T. Oslar); 



