MOUNTAIN ANTS OF NORTH AMERICA. 555 



173. Formica (Neoformica) pallidcfulva subsp. nitidiventris Emery. 

 ^Yith the same distribution and western limits as the preceding. 



174. Formica {Neoformica) paUidefulva subsp. nitidiventris var. 

 fuscata Emery. 



Also known to occur as far west as New Mexico, but more abundant 

 in the Eastern States. 



175. Formica (Neoformica) mold Wheeler. 

 Recorded from Arizona and Utah. 



176. Poly gems lucidiis Mayr subsp. montivagus Wheeler. 

 Colorado: Colorado Springs (Wheeler). 



The typical lucidus is known only from the Eastern and Central 

 States as far west as South Dakota. 



177. Poly gcr lis rufesccns Latr. subsp. breviceps Emery. 

 Colorado; Breckenridge (P. J. Schmitt); Florissant, Ute Pass and 



Colorado Springs (Wheeler). 



New Mexico: Old Pecos Pueblo (T. D. A. Cockerell). 



Kansas: Osage City (A. C. Burrill). 



Illinois: Algonquin (W. A. Xason); Galesburg (M. Tanquary). 



Montana: Elkhorn Mts. (W. M. Mann). 



California: Santa Cruz (H. Heath); Kern Lake (J. C. Bradley); 

 Fallen Leaf Lake and Glen Alpine, near Lake Tahoe (Wheeler). 



Washington: Pullman (W. M. Mann). 



In extending to Illinois this subspecies overlaps the distribution of 

 lucidus in the Mississippi Valley. My observations on the slave- 

 raids of breviceps at Lake Tahoe are published in the Proc. N. Y. Ent. 

 Soc. 24, 1916, pp. 107-118. 



178. Polyergus rufescens subsp. breviceps var. montezuma Wheeler. 

 Mexico: Pachuca in Hidalgo (W. M. Mann). 



179. Polyergus rufescens subsp. breviceps var. umbratiis Wheeler. 

 California: Brookdale (H. Heath). 



180. Polyergus rufescens subsp. breviceps var. fusciventris var. nov. 

 Worker. Length 4 mm. 



D flf ering from the typical breviceps in its smaller size, more opaque 

 and more coarsely shagreened surface, in having the petiolar node 

 distinctly shorter and more compressed anteroposteriorly and the 



