MOUNTAIN ANTS OF NORTH AMERICA. 555 



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

 With the same distribution and western Hmits as the preceding. 



174. Formica (Neoformica) pallidefulva 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) moki Wheeler. 

 Recorded from Arizona and Utah. 



176. Polygerus lucidus 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. Polygerus rufescens 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. Nason); 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. Folyergus rufescens subsp. breviceps vox. montezuma Wheeler. 

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



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

 California: Brookdale (H. Heath). 



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

 Worker. Length 4 mm. 



Differing 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 



