MOUNTAIN ANTS OF NORTH AMERICA. 531 



New Jersey: Weasel Mt. and Lakehurst (Wheeler). 



New York: Bronxville and White Plains (Wheeler). 



Connecticut: Colebrook (Wheeler). 



Massachusetts: Franklin and Boston (Wheeler); Needham (A. P. 

 Morse). 



As shown by the list of localities, this species has a very wide range, 

 from Boston to San Francisco. It is rather sporadic and nests under 

 large stones in dry fields and pastures. 



92. Lasius (Acanthomyops) interjecfus Mayr. 

 Washington: Pullman (W. M. Mann). 



Colorado: Manitou, Cheyenne Canyon and Colorado Springs 

 (Wheeler); Longmont (P. J. Schmitt). 



New Mexico: Las Valles (Mary Cooper). 



Montana: Flathead Lake (C. C. Adams). 



Specimens of all three phases from these localities are indistinguish- 

 able from those of the Central and Eastern States where the species is 

 much more common. It nests in rather dry, sunny places. The basal 

 border of the mandibles in the worker and female, is distinctly denticu- 

 late, a peculiarity which I have not observed in our other species of 

 the subgenus Acanthomyops. 



93. Lasius {Acanthomyops) interjectus subsp. californicus subsp. nov. 

 Worker. Length 2.6-3 mm. 



Much smaller than the worker of the typical form, which measures 

 4-5 mm., with the basal border of the mandibles very indistinctly 

 denticulate and the funicular joints of the antennae a little shorter and 

 the scapes much shorter, extending only slightly beyond the posterior 

 corners of the head. The sides of the head are distinctly less convex. 

 The mesoepinotal constriction is much feebler and the base of the 

 epinotum much less convex, narrower and rounded. Color/ sculpture 

 and pilosity much as in the typical form. 



Female. Length 7.5 mm. 



Somewhat smaller than the typical form and of a different color, the 

 thorax, petiole and gaster being rich reddish castaneous, the head, base 

 of first gastric segment and the appendages red. The infuscation of 

 the bases of the wings is scarcely perceptible. The petiole is much 

 broader and more deeply excised than in the female of the typical 

 interjectus and the fimicular joints of the antennae are distinctly 

 shorter. 



Described from eleven workers taken by myself from a single colony 



