202 MICROTUS. 



b.— irvlcoloides. {Au/acomys), Rhoads, Amer. Natur. , 1894, xxviii, 

 p. 183. 



principalis, Rhoads, Amer. Nat., 1895, xxix, p. 940. 



Type locality. Lake Kichelos, Kittitas county, Washington. 

 Altitude, 8,000 feet. 



Geogr. Distr. Cascade range, Oregon and Washington. 



Genl. Char. Size large; tail less than half the length of body 

 and head; premaxillaries extending beyond nasals. 



Color. Summer Pelage. Above reddish brown lined with black; 

 beneath hoary plumbeous, throat lighter. Tail blackish above, 

 whitish beneath; feet blackish; whiskers black. Winter Pelage. 

 Darker than summer pelage; belly nearly white. 



Measurements. Total length, 197-253; tail vertebrae, 70-81 ; hind 

 foot, 27-29.3; ear, 10. 



G. Neofiber . 

 Neofiber. True, Science, 1884, 18, p. 34. 



Skull and dentition as in Fiber. Feet normal; toes not bent 

 laterally at an angle with the sole; tail round. (True, 1. c.) Plantar 

 tubercles, five; side glands conspicuous. 



Fig. 44. Microtus (Neofiber) alleni. 



No. 572 Field Columbian Museum Coll. Nat. size. 



Lower tooth row. 



Enlarged 3 times. 



Upper tooth row. 

 Enlarged 3 times. 



