440 bulletin: museum of comparative zoology. 



F. TRUNCICOLA INTEGROIDES Var. COLORADENSIS, Var. nOV. 



F. rufa subsp. Integra var. coloradensis Wheeler, Ants, 1910, p. 570. 



Worker. Length 4-9 mm. 



Differing from the typical integroides in its somewhat greater aver- 

 age size, in having more shining mandibles and frontal area, and in 

 the pilosity, which is pale yellowish and as abundant as in the Euro- 

 pean truncicola, covering all parts of the body, except the antennae. 

 The scapes often have a few scattered suberect hairs and the eyes are 

 distinctly hairy. Oblique hairs on the extensor surfaces of the tibiae 

 as long as those on the flexor surfaces. The pubescence is also long 

 and abundant, conspicuous on the head and thorax as well as the 

 gaster. Small and large workers are of the same color. 



Head, thorax, petiole, legs, and antennae bright red, mandibles 

 darker; gaster dark brown, with red anal region and often with a 

 small red spot at the base of the first segment. 



Female. Length 8-10 mm. 



Mandibles more opaque and more coarsely sculptured than in the 

 worker. 



Pilosity and pubescence similar to those of the worker, but the 

 former whitish, more delicate and less conspicuous on the thorax. 

 Pubescence on the gaster more dilute so that this region is slightly 

 lustrous or shining and not opaque as in the worker. 



Color like that of the worker; raesonotum with three elongate 

 brown spots; funiculi, metanotum, and posterior border of scutellum 

 infuscated; mandibles deep red. Wings grayish hyaline, distinctly 

 infuscated towards the base. 



Type locality.— Colorado: Florissant, 8,100 ft. 



Colorado: Wild Horse and Woodland Park, 8,500 ft. (Wheeler); 

 Ward, 9,000 ft. (T. D. A. Cockerell); Boulder, Breckenridge (P. J. 

 Schmitt). 



New Mexico: Pecos, Beulah, 8,000 ft. (T. D. A. Cockerell and Mrs. 

 W. P. Cockerell). 



Idaho: Blackfoot, Market Lake (J. M. Aldrich). 



Of all our forms this is most like the typical European truncicola 

 in pilosity. It differs, however, in color, the red parts being lighter 

 and the gaster with an inconspicuous yellow base and a peculiar bluish 

 bloom, due to the dense gray pubescence covering a blackish surface. 

 Its habits are similar to those of the European species since it nests 

 under and in stumps and logs, filling their interstices with vegetable 

 debris, but the colonies are much larger than those of the European 



