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 zntegroides 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. 
FremMaLe. 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; mesonotum with three elongate 
brown spots; funiculi, metanotum, and posterior border of scutellum 
infuscated; mandibles deep red. Wings grayish hyaline, distinctly 
infuscated towards the base. 
TyprE LocaLiry.— 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 
débris, but the colonies are much larger than those of the European 
