316 AXNALS NEW YORK ACADEMY OF SCIENCES 



side, separated by a rather deep notch or sinuosity from the lateral corner of 

 the sclerite. Antennal scapes slender at the base, neither flatten^ nor dilated, 

 enlarged towards the tip. Thorax long and slender, low in profile and regu- 

 larly arched above; epinotum sloping, its base nearly twice as long as the 

 declivity. Petiole rather high and narrow, with feebly convex anterior and 

 posterior surfaces and blunt border. Legs long ; middle and hind tibiae some- 

 what flattened, triangular in cross-section, grooved on their anterior surfaces. 



Shining throughout, head more opaque behind; mandibles coarsely striato- 

 punctate; head densely shagreened and covered with sparse punctures or 

 foveolse, which are large and elongate on the cheeks, clypeus and front, small 

 and round on the sides. Thorax and gaster very finely and superficially 

 shagreened. 



Pilosity yellow, resembling that of vicinus but more abundant; mandibles, 

 clypeus. cheeks and sides of head with short, erect hairs ; antennal scapes 

 with numerous short, stiff hairs arising from coarse punctures; hairs on the 

 clypeal border short and inconspicuous. Legs with very short, scattered and 

 oblique hairs ; flexor surfaces of middle and hind tibiae without rows of 

 bristles. Pubescence very feebly developed, especially on the thorax and 

 gaster. where it is very short and scattered, somewhat longer and more con- 

 spicuous on the posterior portion of the head. 



Mandibles and head dark reddish brown or black, clypeus and front usually 

 paler. Antennal scapes dark brown, yellow at the extreme base; funiculi 

 yellow, first joint brown. Thorax clay yellow, sometimes brownish on the 

 pro- and mesonotum. Petiole and legs yellow, tarsi and tibiae sometimes 

 brownish or reddish. Gaster dark brown, posterior borders of segments and 

 base of first segment clay-yellow. 



Worker minor. Length, 8-10 mm. 



Head much as in vicinus. longer than broad, with parallel sides and rounded 

 posterior border. Clypeus like that of the worker major. Antennae long and 

 slender. Thorax narrow. Petiole very blunt, almost conical. Legs long and 

 slender. 



In sculpture and pilosity very similar to the worker major, even to the 

 foveolae on the head and the short, erect hairs on the antennal scapes and 

 sides and front of head. Color also similar, but the head is pale brown, the 

 clypeus. cheeks and front yellow and the yellow at the base of the gaster is 

 more extensive, sometimes embracing the whole of the first and much of the 

 second segment. 



Female. Length, 14 mm. 



Resembling the worker major in sculpture, pilosity and color. Base of 

 epinotum much longer in proportion to the declivity than in vicinus. Petiole 

 broader, with more acute border. Wings long (13 mm.), strongly suffused 

 with yellow ; veins and stigma brownish yellow. 



Described from inimerous workers taken by Mr. C. E. Biedernian 

 from two large colonies nesting under stones at Palmerlee, Arizona. 

 (5000 and 6000 ft.) and a single female taken by Dr. H. Skinner in the 

 Huachuca Mts. of the same territory.^ 



° I have taken this species in Hunter's Canyon in the same mountains. 



