542 WHEELER. 



128. Formica dakotensis var. saturata var. nov. 

 Worker. Length 4.5-5 mm. 



Averaging a little smaller than the other forms of the species and of 

 a much deeper color, the head, thorax, petiole and appendages being 

 rich blackish red, nearly as dark as the gaster, the cheeks and anterior 

 portion of the head sometimes a little paler. The pilosity is like that 

 of the typical dakotensis, the erect hairs being exceeding scarce on the 

 head and thorax and lacking on the gula. 



Described from a dozen workers taken by Dr. W. M. Mann at 

 Helena, Montana. 



129. Formica microgyna Wheeler. 



Known only from Manitou and Florissant, Colo. (7000-8100 ft.). 



130. Formica viicrogyna var. recidiva Wheeler. 

 Colorado and New Mexico. 



131. Formica viicrogyna subsp. rasilis Wheeler. 

 Colorado: Buena Vista (Wheeler). 



Recorded previously from several localities in Colorado, New 

 Mexico, Utah and Washington. 



132. Formica viicrogyna subsp. rasilis var. spicata Wheeler. 

 Known only from Florissant, Colorado, 8100 ft. 



133. Formica viicrogyna subsp. rasilis var. jmllnla Wheeler. 

 Taken at Flathead Lake, Montana, by Prof. C. C. Adams. 



134. Formica microgyna subsp. rasilis var. nahua Wheeler. 

 Taken by Dr. W. M. Mann at Guerrero Mill (9000 ft.) and Velasco 



in Hidalgo, Mexico. 



135. Formica microgyna subsp. rasilis var. pinetorum var. nov. 

 Worker. Length 3.5-6 mm. 



Very similar to the var. spicata but differing in the darker, more 

 blackish gaster, its much more abundant, obtuse hairs and the greater 

 tendency to infuscation of the red regions of the body in the large and 

 median workers. In the latter the ocellar region is black and there is 

 a very distinct, elongate triangular black spot on the mesonotum, with 

 dark clouds on the pronotum and occiput. In small workers the infus- 

 cation is more extensive on the head and pronotum and the legs and 



