WHEELER: ANTS OF THE GENUS FORMICA. 519 
and mesonotum infuscated. Tips of funiculi not infuscated. The 
gaster is black, not paler ventrally. Small workers often have the 
head and thorax dark brown. In some large specimens the head is 
immaculate above. The hairs are sparse and scarcely more abundant 
on the thorax than in the variety occidua. 
FEMALE. Length: 7-8 mm. 
Smaller than the female of the typical rufibarbis. Surface subopaque 
and gaster somewhat shining as in the worker. Pubescence longer 
and denser, hairs more abundant. Head, thorax, and petiole brown; 
mandibles, cheeks, clypeus, antennae, and legs yellow; mesonotum 
with three large dark brown blotches, often more or less: confluent. 
Gaster blackish brown. Wings colorless, with dark brown veins and 
stigma. 
Maur. Length 7-8 mm. 
Mandibles edentate or indistinctly tridentate. Thorax and gaster 
stout. Petiole much as in the typical form but with the notch in its 
superior border often obsolete or narrow. 
Surface of body, including the frontal area, opaque; head and thorax 
coarsely, gaster more finely shagreened; the gaster slightly lustrous. 
Hairs extremely sparse, absent on the upper surface of the thorax 
and gaster. Pubescence grayish, short but rather abundant. 
Head and thorax black; gaster dark brown; genital appendages 
strongly infuseated. Legs yellow. Wings as in the female. 
TYPE LOCALITY.— Texas. 
Texas: Austin, Fort Davis, New Braunfels, Langtry (Wheeler); 
Llano (A. W. Morrill); Kerrville, Devil’s River (F. C. Pratt). 
New Mexico: Las Vegas (T. D. A. Cockerell); Las Valles (Miss 
Mary Cooper); Mesa Negra, San Ildefonso (EK. L. Hewett and Miss 
Ruth Reynolds); Albuquerque (Wheeler); Alamogordo (G. v. 
Krockow). 
Arizona: Indian Garden, Grand Canyon, Phoenix, Prescott, Tempe, 
Tucson, Benson Miller Canyon, Huachuca Mountains (Wheeler); 
Ramsey Canyon, Huachuca Mountains (W. M. Mann). 
California: Needles (Wheeler). 
Colorado: Canyon City (P. J. Schmitt); Salida (Wheeler). 
Utah: Lehi (W. A. Hooker). 
This variety has been confounded with F’. fusca var. neorufibarbis 
and var. gelida by Emery, Forel, and myself, owing to the somewhat 
shining surface of the gaster, but a study of living colonies shows that 
it belongs to rufibarbis, for the workers have the characteristic odor 
of this species, are aggressive, and live in the ground under stones 
or in nests without craters. ‘They are found only in shady canyons 
at rather low altitudes in the Southwest, never in the open desert 
