MOUNTAIN ANTS OF NORTH AMERICA. 517 



64. Aphaenogaster texana xnv. furvcscens Wheeler. 

 Described from the Huachuca Mts., Arizona. 



65. Aphaenogaster fidva Roger subsp. aquia Buckley var. rudis 

 Emery. 



Several workers, a dealated female and a male of this form were 

 taken by me at Boulder, Colo. July 29, 1906. Like other forms of the 

 species it is common in the Central and Eastern States and reaches the 

 western limit of its range on the eastern slopes of the Rocky Mts. 



66. Aphaenogaster fulva subsp. aquia var. azteca Emery. 



A form closely related to the preceding but more coarsely sculptured. 

 It was described from Mexico without more precise locality. 



67. Aphaenogaster uinta sp. nov. 

 Worker. Length 4.5-5 mm. 



Head subrectangular, a little longer than broad, as broad in front 

 as behind, with straight sides and rounded posterior corners and with a 

 distinct pit-like impression in the median line on the vertex between 

 the eyes. These are rather large, convex and situated near the median 

 transverse diameter of the head. Mandibles with straight external ■ 

 borders and convex tips, with three larger apical and several more 

 indistinct basal teeth. Clypeus moderately convex, its anterior 

 border rather deeply notched in the middle. Frontal area distinct; 

 frontal carinae small, erect in front, continued behind into slightly 

 converging ridges. Antennae slender; scapes surpassing the posterior 

 border of the head by somewhat less than \ their length, curved at 

 the base and slightly thickened at the apex; funiculi with a distinct 

 4-jointed club; first funicular joint longer than second; joints 2-7 

 subequal, nearly twice as long as broad, joints 8-10 subequal, less 

 than twice as long as broad, terminal joint distinctly longer. Thorax 

 slender; pro- and mesonotum together forming a convex, hemispheri- 

 cal mass, the anterior border of the mesonotum not projecting above 

 the pronotum, sloping and concave behind. Seen from above the 

 mesonotum is narrow, more than twice as long as broad. Mesoepino- 

 tal constriction rather deep. Epinotuni long, somewhat less than 

 twice as long as high, in profile with the base perfectly straight and 

 horizontal, and on each side passing into the declivity, with a rectangu- 

 lar projection, representing the spine of other species. Seen from 

 above the dorsal surface of the base is longitudinally impressed in the 

 middle. Petiole short, its peduncle shorter than the node, which is 



