122 BROOKLYN INSTITUTE MUSEUM. SCIENCE BULLETIN I I ; 5. 



ventral surface dull grayish washed with buff, the hairs blackish plumbeous 

 basally for three fourths of their length, tipped with buffy gray ; top of head and 

 nuchal region gray, tinged with buff, the tips of the hairs black, giving a black- 

 ish gray effect, but quite different from the same region in O. schisticeps ; ears 

 blackish externally, narrowly edged with white; inside grayish dusky, with the 

 long hairs at the inner base whitish; fore feet buffy gray above, soles silvery 

 gray ; hind feet similar above, soles blackish. 



Skull similar to that of O. schisticeps but very much smaller, less convex 

 and more depressed, and the audital bullae are much smaller and much less 

 swollen. 



Unfortunately there are no external measurements from the fresh specimen, 

 but the skull shows it to be a much smaller species than either O. schisticeps, 

 O. cuppes, or O. princeps, the total length being 40 mm., as against 43 in O. 

 schisticeps, and 45 in true O. princeps (from Banff, Alberta). In the dry skin 

 the hind foot measures 27 mm. and the ear 23. 



O. dnnamomea differs from all of its known North American 

 congeners by its much smaller size and much more rufous coloration, 

 and from schisticeps especially by lacking the well-defined slaty-gray 

 area on the head and nape, which in O. cinnamomea differs from the 

 back only in being less suffused with cinnamon and more strongly 

 washed with black. 



This species is represented by two specimens, collected by Mr. 

 Engelhardt in the Beaver Range mountains in Beaver County, Utah, 

 at an elevation of 11,000 feet. As the Beaver Range is separated by 

 desert areas of relatively low elevation from any of the other mountain 

 ranges of Utah, this colony of alpine animals has evidently been long 

 isolated and subjected to unusual conditions of environment for mem- 

 bers of the family Ochotonidse. According to Mr. Engelhardt it lives 

 in colonies at from about 10,000 to 11,000 feet. 



l6. PUTORIUS ARIZONENSIS (MeOTHS). 



One specimen, Briggs Meadows, Belknap Peak, altitude 1 1 ,000 feet, 

 August 20. 



