MOUNTAIN ANTS OF NORTH AMERICA. 539 



but with more numerous erect hairs on the head, gula, thoracic dorsum 

 and petiolar border than even in the typical integroides , and these 

 hairs are coarse and bhmt on the thorax. The head is a Httle less 

 narrowed in front than in the var. tahoensis, the cheeks feebly convex, 

 the eyes of the same size. 



Described from numerous specimens taken from several colonies in 

 the same localities as the var. tahoensis. As the differences of pilos- 

 ity of these two varieties appear to be constant throughout the colo- 

 nies, it seems necessary to regard them as distinct. It is not improba- 

 ble that they really belong to different altitudes, propinqiia preferring 

 the hot moraine region (6000 ft.) between Fallen Leaf Lake and Lake 

 Tahoe and tahoensis the greater elevations (7000-7500 ft.), but as I 

 did not distinguish the two forms in the field, owing to their great simi- 

 larity in size and color, I am unable to make a positive statement on 

 this matter. 



112. Formica truncicola subsp. integroides var. color adensis Wheeler. 

 Colorado: Bullion Peak, Park County 12,000 ft., Gibson's Peak, 



10,000 ft. and Wilson Peak, 13,000 ft. (E. J. Oslar); Creede 8844 ft. 

 (S. J. Hunter); Tolland (W. W. Robbins). 



Known also from other localities in Colorado, from New Mexico 

 and Idaho. 



113. Formica truncicola subsp. integroides var. haemorrhoidalis 

 Emery. 



Colorado: Creede, 8844 ft. (S. J. Hunter). 



This form seems to be more widely distributed than coloradeyisis as 

 it is known to occur in Colorado, South Dakota, Idaho, Nevada and 

 Washington. 



^o' 



114. Formica truncicola subsp. integroides var. ravida Wheeler. 

 Known only from Elkhorn and Helena, Montana (W. M. Mann). 



115. Formica truncicola subsp. integroides var. suhfasciata var. nov. 

 Worker. Length 6-8.5 mm. 



Averaging considerably larger and apparently much more feebly 

 polymorphic than the typical integroides. Erect hairs on the upper 

 surface of the head, thorax and petiole much less numerous. The red 

 color of the body is paler and clearer and without traces of infuscation 

 even in the smaller workers. Gaster with the base of each of the seg- 

 ments dull red. Tips of antennal funiculi scarcely infuscated. Anus 

 red as in the other forms of the subspecies. 



