WHEELER: ANTS OF THE GENUS FORMICA. 443 
front. Tibiae with oblique and rather long pubescence on their 
flexor surfaces. Pubescence gray, long, dense, and suberect on the 
gula, upper surface of the head and thorax, appressed on the antennal 
scapes and gaster. The latter region is slightly more lustrous than in 
the worker. 
Head, thorax, and petiole sordid brownish yellow; mandibles, ocellar 
region, posterior corners of head, posterior border of pronotum, 
mesonotum, scutellum, metanotum, mesopleurae, legs, antennae, 
and sometimes also the upper border of the petiole, brown; gaster 
blackish brown, with slightly reddish anal region. Wings distinctly 
infuscated, scarcely paler towards their tips; veins and stigma brown. 
Mate. Length 7-8 mm. 
Mandibles edentate, clypeus convex, carinate, transversely im- 
pressed behind; head rather broad; eyes large. Petiole low and thick 
with rounded, entire superior border. 
Mandibles and frontal area shining; head and thorax opaque; gas- 
ter, pleurae, legs, and genitalia lustrous. 
Hairs yellowish, very short, erect, and rather abundant on the head 
and thorax, sparser and more appressed on the upper surface of the 
gaster, absent on the legs. Pubescence grayish, moderately developed, 
most distinct on the gaster. 
Black; even the tips of the mandibles not paler; genital sclerites 
black or castaneous, with yellowish insertions. Wings infuscated 
as in the female. 
Type LocALity.— Colorado: Colorado Springs. (Wheeler). 
Colorado: Colorado City, Malvern, Wild Horse, Manitou (Wheeler) ; 
West Cliff (P. J. Schmitt). 
This form is rather puzzling. It is perhaps a distinct species, but 
I have preferred to regard it provisionally as a subspecies of truncicola. 
The small, almost hairless and peculiarly colored females enable one 
to recognize the species better than the workers, which at first sight 
resemble those of F. truncicola integroides vars. haemorrhoidalis and 
coloradensis. The new form differs from these varieties, however, in 
pilosity and pubescence, and in the smaller average size of all three 
phases. The males are peculiar in being almost entirely black, even 
to the greater portion of the genital appendages. 
I found several colonies of this ant both in 1903 and 1906, each con- 
taining many females and males. They were nesting in open places, 
at altitudes of about 5,000-7,000 feet, under stones banked with 
vegetable detritus. 
