530 WHEELER. 



This ant might be regarded as an extreme subspecies of umbratus, 

 but the worker and female are decidedly smaller even than the corre- 

 sponding phases of the eastern subsp. minutus Emery, the female, 

 indeed, being smaller than that of any other North American Lasius. 

 The different proportions of the funicular joints seem to justify a 

 specific name, as the joints 9 and 10 are very distinctly longer. The 

 eyes of the worker are smaller, the promesonotal suture is much less 

 deeply impressed and the mesonotum much less convex and projecting, 

 the mesoepinotal impression shallower than in umbratus and the petio- 

 lar border not so sharp. 



89. Lasius (Acanthomyops) occidentalis Wheeler. 

 Colorado: Colorado Springs and Ute Pass (Wheeler). 



New Mexico: Pecos and Trout Spring, Gallinas Canyon (T. D. A. 

 Cockerell); Manzanares (Mary Cooper); Albuquerque (W. H. Long). 



This small species is not known to occur east of the Rocky Mts. 

 and appears to have the most limited range of any species of the sub- 

 genus. 



90. Lasius {AcantJwmyops) murphyi Forel. 

 North Carolina: Morganton, type locality (Forel). 



New York: Cold Spring Harbor, L. I. and Bronxville (Wheeler). 



Ontario : Toronto. 



Colorado: Boulder (P. J. Schmitt and T. D. A. Cockerell). 



Montana: Helena (W. M. Mann). 



This ant appears to belong to the warmer and dryer portions of the 

 Transition Zone and to be rare in all parts of its range. It forms large 

 colonies under stones in open woods. 



91. Lasius (Acanthomyops) latipes Walsh. 



California: Mt. Tamalpais (C. G. Hewitt); Mountain View. 



Washington: Pullman and Wawawai (W. M. Mann); Almota (A. L. 

 Melander); Rock Lake. 



Idaho: Julietta (J. M. Aldrich). 



Utah: Salt Lake Co. (R. V. Chamberlin). 



Colorado: Manitou and Florissant (Wheeler); Boulder (P. J. 

 Schmitt and T. D. A. Cockerell). 



New Mexico: Las Vegas (T. D. A. Cockerell); Albuquerque (W. H. 

 Long). 



Illinois: Rockford (Wheeler). 



Pennsylvania: Enola. 



