MOUNTAIN ANTS OF NORTH AMERICA. 527 



and more nearly eireular eyes wliieli have only 11-13 ommatidia. 

 The funicular joints of the antennae are slightly longer. The petiole 

 is narrower, with straight sides and broadly and feebly emarginate 

 superior border, whereas the typical hrnncornis has the node entire 

 with more rounded sides and border. The pubescence on the head 

 and thorax is distinctly shorter so that the surface is more shining 

 and the color of the body is not a pure but a more brownish yellow. 



Described from numerous specimens taken from a large colony 

 under a stone at Yosemite Village, 4000 ft., Cala. 



S3. Lasius (Formiciua) flavus Fabr. subsp. vearcticus Wheeler. 



Colorado: Topaz Butte, 9000 ft., near Florissant, and Salida 

 (Wheeler). 



This form is common throughout the Eastern and Middle States but 

 evidently rare in the arid west, probably because of its preference for 

 damp, shady situations. In the eastern .states and Canada I have 

 found it only in moist woods. 



84. Lasius (Formicina) flavus subsp. claripennis subsp. nov. 



Worker. Length 2.6-3 mm. 



Similar to the typical flavus of Europe and the subsp. ncarcticus 

 but averaging smaller and with the antennae shorter, the scapes 

 scarcely surpassing the posterior corners of the head. The color of 

 the body is brownish yellow as in the true flavus and not pale yellow 

 with whitish gaster as in nearcticus. The eyes are distinctly smaller 

 and much as in the European subsp. myops Forel. 



Female. Length 7 mm. 



Differing from the female flavus and nearcticus in the shorter 

 antennae, the scapes of which reach only to the posterior corners of the 

 head. The wings are not infuscated at the base as in these forms, but 

 clear and hyaline throughout and the posterior portion of the head and 

 thoracic dorsum is dark brown, much darker than in nearcticus and 

 perceptibly darker than in the typical flavus. 



Male. Length 3 mm. 



Differing from the male flavus and nearcticus in having slightly 

 shorter antennae, in its smaller size and the darker, nearly black color 

 of the body. 



Described from numerous workers, four females and six males taken 

 Aug. 20th from several colonies nesting under stones on the southern 

 slope of 't'unnel Mt. at Banff, Alberta. Several workers received 

 from P'arewell Creek, Southern Saskatchewan (E. G. Titus), three 

 workers from Pullman, Washington, and a series of workers, males 



