WHEELER, NORTH AMERICAN ANTS 331 



scapes and femora are black. Middle and hind tibiae with only a few short 

 bristles at the distal ends of their flexor surfaces. 



Worker minor. Length, 6-8 mm. 



Head somewhat broader than long, but little broader behind than in front, 

 with feebly convex sides and nearly straight posterior border. Eyes slightly 

 convex, clypeus cariuate. Antennal funiculus extending about one-third its 

 length beyond the posterior corners of the head. In other respects like the 

 worker major. 



Female. Length, 13-16 mm. 



Very much like the worker major. Head with somewhat straighter sides, 

 but broader behind than in front. Eyes larger and more convex. Thorax 

 through the wing-insertions scarcely broader than the head ; epinotum with 

 convex base, impressed in the middle ; declivity longer and distinctly concave. 

 Petiole more compressed than in the worker major, narrow and high, with 

 rounded, entire and more acute border. 



Surface throughout more shining than in the worker, especially the thorax, 

 which is quite glabrous above ; epinotum opaque, shagreened. Gaster very 

 finely transverselj- shagreened and covered with small punctures. Mesonotum 

 and gastric segments also with a few scattered piligerous foveolse. 



Pilosity like that of the worker, but sparser and shorter. Pubescence also 

 shorter and sparser, especially on the gaster. 



Black ; mandibles, legs, antennae and often also the epinotum, pleurre and 

 petiole tinged with red. Wings very long (in large specimens 18 mm.), 

 strongly tinged with brown ; veins and stigma yellowish brown. 



Male. Length, 9-10 mm. 



Head through the eyes about as broad as long ; broadly rounded behind ; 

 ■cheeks feebly convex, converging anteriorly, as long as the eyes. Ocelli very 

 small. ^Mandibles edentate. Clypeus convex in the middle, but scarcely cari- 

 nate, its anterior border broadly rounded and slightly sinuate in the middle. 

 Thorax robust ; epinotum with flattened and subequal base and declivity meet- 

 ing to form a rounded obtuse angle. Petiole rather high, distinctly compressed 

 anteroposteriorly, with thin, rather acute border, which is deeply excised in 

 the middle above. 



Opaque ; very finely shagreened ; gaster shining. 



Hairs and pubescence shorter and sparser than in the worker, especially on 

 the head and thorax. Cheeks without hairs. Short hairs on the legs and 

 antennal scapes appressed and scarcely more than pubescence. 



Black ; mandibles, antenna? and legs reddish. Wings paler than those of the 

 female; veins and stigma yellow. 



Forel based this variety on specimens from Alberta. I have seen a 

 large number of individuals from the following localities : 



Alberta: Field, Vermillion Pass and Lake Louise, cotypes (Whvm- 

 per) ; Eed Deer: Banff (J. C. Bradley). 



Alaska: (Dall) : Kasiloff Lake, Kenai Peninsula (Berlin Mus.); 

 Koyukuk (W. J. Peters). 



