134 Bailey The American Voles of the Genus Evotomys. 



June specimens almost naked, not rufous ; lateral glands well defined in 

 half of the specimens examined, conspicuous in the type and two other 

 old males. 



Color. Upper parts dark bister or sepia, becoming dusky on rump and 

 dull, dark chestnut on back ; dorsal area indistinct and shading gradually 

 into color of sides; oval patches of dense fur covering side glands plum 

 beous in slight contrast to surrounding fur; belly pale buffy or soiled 

 whitish, darkened by the plumbeous under fur; tail sharply bicolor, 

 blackish above and at tip all round, whitish beneath; feet whitish or 

 but slightly dusky ; ears dusky, with no rufous or light-colored hairs. 



Cranial and dental characters. Skull thick and heavy, with short, stout 

 decurved rostrum ; audital bulke and pterygoids both relatively and act 

 ually larger than in any other species ; palatines usually triangular in 

 outline instead of U-shaped, as in other species, and with a triple or single 

 pointed posterior projection ; zygomatic arches bent well down and not 

 abruptly spreading ; molars wide and heavy ; enamel folds crowded lon 

 gitudinally and irregular ; posterior upper molar short, with terminal 

 loop very small or, in 4 specimens out of 6, absent. 



Measurements. Type, measured in flesh by T. S. Palmer: total length, 

 161; tail vertebrae, 50; hind foot, 21. An adult $ from Yaquina Bay, 

 Oregon, measured by B. J. Bretherton : total length, 163 ; tail vertebrae, 55 ; 

 hind foot, 20. Skull: basal length, 22.8 ; nasals, 7.5; zygomatic breadth? 

 14; mastoid width, 12.3 ; alveolar length of upper molar series, 5.3. 



General remarks. In geographic position this species lies nearest to 

 E. obscurus on the east and to E. occidentals on the north, and with these 

 species only does it need comparison. The darker color, larger size, and 

 longer tail distinguish it at a glance from E. obscurus without reference to 

 the numerous cranial differences. Specimens from localities away from 

 the coast (Willetts and Sherwoods, near the center of Mendocino Count} 7 , 

 California) are somewhat smaller and lighter colored than the type, which 

 suggests that the species may grade into E. obscurus, though at present no 

 intermediate specimens are available. E. californicus is readily distin 

 guished from its northern neighbor, E. occidentals, by light feet and belly, 

 bicolor tail, larger size, and blacker coloration, in contradistinction to the 

 sooty feet and belly, concolor tail, smaller size, and more rufous back of 

 occidenlalis. 



Specimens examined. Total number, 9, from the 5 following localities : 

 California: Eureka,]; Willetts, Mendocino County, 3 ; Sherwoods, 3. 

 Oregon: Yaquina Bay, 1; Oregon City, 1. 



Evotomys occidentalis Merriam. 



Evotomys occidentalis Merriam, North American Fauna, No. 4, p. 25, pi. ii, 



fig." 1 , Oct. 8, 1890. 

 Evotomys pygmseus Rhoads, Proc. Phila. Acad. Nat. Sci., p. 284, October, 



1894. 



Type locality. Aberdeen, Washington. 



Geographic distribution. Coast and Puget Sound region of Washington 

 and southern British Columbia. 



