506 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
often confined to a spot on the pronotum and one on the mesonotum; 
medium sized workers often have the pleurae more or less infuscated 
and in the smallest workers the whole thorax may be dark brown. 
Base of gaster and venter usually paler than the upper surface. Peti- 
ole more compressed anteroposteriorly, with flatter anterior and pos- 
terior surfaces and sharper border than in any of the preceding forms. 
of fusca. 
FremaLe. Length 6-8 mm. 
Resembling the worker, but the gaster even more shining. ‘This. 
region is also more spherical and less elliptical than in the other forms. 
of fusca. The head and thorax are subopaque, except the frontal area, 
which is shining. Posterior border of the pronotum and the dise of 
the mesonotum with a few large, scattered punctures. 
Reddish brown, posterior portion of head, upper surface of gaster, 
posterior border of pronotum, the mesonotum, scutellum, and metano- 
tum blackish or dark brown. The pleurae may also be clouded with 
this color. Petiole and legs more yellowish brown. In some speci- 
mens (from California) the thorax is pure reddish brown, with three 
large spots on the mesonotum, the metanotum and posterior portion 
of the scutellum black. Wings colorless, with pale brown veins and 
darker stigma. 
Mate. Length 6-7 mm. , 
Head and thorax, including the frontal area, opaque; mesonotum 
covered with coarse, scattered punctures. Epinotum, petiole, and 
gaster shining. Erect hairs on thoracic dorsum, petiole, and base 
of gaster rather abundant. Pubescence very sparse and rather long. 
Black; gaster dark brown; genital appendages distinctly infuscated. 
Legs yellow, middle portions of femora slightly infuscated. Antennae 
black; only the tips of the mandibles brownish. Wings as in the 
female. 
TYPE LOCALITY.— Colorado: Ward, 9,000 ft. (T. D. A. Cockerell). 
Colorado: Arapahoe Peak, timberline, Long’s Peak, 12,500 ft. 
(T. D. A. Cockerell); Cripple Creek, 10,200 ft., Cheyenne Mountain, 
8,000 ft. (Wheeler); Canyon City (P. J. Schmitt). 
New Mexico: N. E. Truches Peak, 12,000-13,000 ft., above timber- 
line (Mrs. W. P. Cockerell and Miss Ada Springer); Harvey’s Ranch, 
Las Vegas Range, 9,600 ft. (Miss Ruth Reynolds); Top of Las Vegas 
Range, 11,000 ft. (T. D. A. Cockerell). 
Arizona: Coconino Forest, Grand Canyon, 7,000 ft. (Wheeler). 
California: Alta Peak, Sequoia National Park, 9,500—-11,000 ft., 
Blue Lake, Humboldt Co. (J. C. Bradley). 
Oregon: (Amer. Mus. Nat. Hist. Coll.). 
Washington: Three Brothers, Olympic Range (J. C. Bradley). 
