454 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
scutellum, and the alar insertions black or infuscated. Wings uniformly 
grayish hyaline; veins and stigma more yellowish gray, the latter not 
very conspicuous. 
Mate. Length 6.5-8 mm. 
Mandibles edentate, sharply pointed. Head very short, very broad 
behind the eyes, very narrow in front, occipital border straight. 
Clypeus strongly carinate. Maxillary palpi 5-jointed. Thorax 
robust, broader than the head. Petiole thick, convex anteriorly, 
more flattened posteriorly, border very blunt, evenly rounded and 
entire both in profile and when seen from behind. 
Mandibles and upper surface of body slightly shining, remainder 
of body, including the frontal area, opaque. 
Head, thorax, petiole, and base of gaster with short, rather dense 
hair; pubescence grayish, moderately developed on these and the re- 
maining portions of the body and appendages. [yes distinctly hairy. 
Deep black even to the tips of the mandibles and appendages; geni- 
talia yellowish, the separate sclerites tipped and bordered with black 
and castaneous. Wings grayish hyaline, distinctly infuscated towards 
their bases; veins dark brown, stigma black. 
Host (Temporary). Unknown; probably F. fusca var. argentea. 
TYPE LOCALITY.— Colorado (Mayr). 
Colorado: Manitou, Ute Pass, Colorado City, Colorado Springs, 
Malvern, Wild Horse (7,000—-8,000 ft.) (Wheeler). 
Montana: Elkhorn (W. M. Mann). 
The aberrant type of female, with its remarkable pilosity so much 
like the trichomes of many myrmecophilous beetles, suggests that 
this ant must be a temporary parasite on some one of the Colorado 
varieties of F. fusca, but up to the present time it has not been taken 
in mixed colonies. Although the female may be distinguished at a 
glance from the females of any of the known species of Formica, the 
worker and male are not so easily recognized, since they closely re- 
semble the various western forms of rufa and truncicola and the two 
following species, comata and criniventris. The ground color and 
pilosity of the gaster of the worker are, nevertheless, peculiar, the 
erect hairs being very short and stubby, and more abundant than in 
any of the foregoing species. 
45. F. comata Wheeler. 
F. comata Wheeler, Journ. N. Y. ent. soc., 1909, 17, p.85, 8 @ oH. 
WorkKER. Length 4.5-7 mm. © 
Allied to F. ciliata Mayr. Head, excluding the mandibles, as broad 
as long, broader behind than in front, with rounded posterior cor- 
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