MOUNTAIN ANTS OF NORTH AMERICA. 549 



blackish, with a few small reddish spots at the anterior end of the 

 mesonotum and on the pleurae. Coxae yellowish red, like the legs. 

 Thorax with erect hairs on the dorsal surface; those on the gaster 

 longer than in the worker and pointed. Petiole broad, much com- 

 pressed anteroposteriorly, its anterior and posterior surfaces flat, its 

 superior border transverse and emarginate in the middle. Gaster 

 long and narrow, more than twice as long as broad. Wings grayish 

 hyaline, with pale brown veins and dark brown stigma. 



Male. Length 7-7.5 mm. 



Very similar to the male of the var. neoclara but with the coxae and 

 bases of the femora black, the external genitalia more infuscated and 

 the thorax more robust and broader through the mesonotum. Wings 

 like those of the female but with darker veins. 



Described from many workers, two males and three females taken 

 from several nests at Emerald Lake, British Columbia, Aug. 12-15 

 (type locality), a dejilated female and several workers from Field, 

 B. C, numerous workers from a single colony which I found at Banff, 

 Alberta and three workers taken at Beaver Creek, Montana (6300 ft.) 

 by Dr. S. J. Hunter. 



This form may represent a distinct species, but as the following 

 variety and the var. hlanda seem to connect it with the var. neoclara 

 I have preferred to regard it, at least provisionally, as a subspecies of 

 fusca. At Emerald Lake the colonies of pruinosa were found only on 

 the open flat delta at the north end of the lake in a rather moist spot 

 traversed by the icy streams from the Emerald Glacier. The nests 

 were peculiar, being small, loose mounds of spruce needles 8 to 12 

 inches in diameter and of about the same height, built about the 

 trunks of the scattered and stunted bushes. The colonies were very 

 populous. The two seen at Field and Banff were nesting under 

 stones, in the latter locality at the base of Tunnel Mt. 



154. Formica fusca subsp. pruinosa var. lutescens var. nov. 



Worker. Differing from the typical pruinosa in color and in 

 averaging a little smaller. Body and appendages pale brownish 

 yellow, the gaster pale brown, the head behind the frontal area dark 

 brown, the thorax and coxae spotted with pale brown. Antennae 

 scarcely infuscated at the tip. The petiole is narrower and its superior 

 border distinctly blunter than in the typical pruinosa, though usually 

 emarginate in the middle. There are no differences in sculpture and 

 pilosity. 



Described from numerous workers taken bv Dr. W. IVI. Mann at 



