ZAPODID.^ 175 



or interspersed with groves or shrubs, and some prefer moist 

 locaHties. They are most often noticed in mo-wing- the grass of 

 meadows inhabited by tliem. They are crepuscular and noctur- 

 nal, but are abroad occasionally in the daytime. 



Genus Zapus Coue:s. (Great — foot.) 

 Nasals long, projecting some distance in advance of the in- 

 cisors ; upper premolar present, very small ; enamel folds of molars 

 crowded; frontal narrow interorbitally ; ears rather long; pelage 

 coarse; four pairs of mamma;. 



Zapus trinotatus Rhoads. (Thrice — Marked.) 



NORTHWEST JUMPING-MOUSE. 



Summer pelage ; a broad, well defined dorsal band from nose 

 to tail black mixed with the color of the sides; head lighter; sides 

 brownish ochraceous butT or yellowish clay color sparsely mixed 

 with coarse black hairs, bordered below with a narrow buff line ; 

 feet white; tail bicolor, dusky above, whitish beneath. Autumn 

 pelage; dorsal band more tlecked with yellowish; sides dull yel- 

 low. Immature; back with less black. 



Length about 240 mm. (9.45 inches) ; tail vertebrae 145 

 (5.70) ; hind foot 33 (1.30) ; ear from^ crown 11 (.43). 



Type locality. Lulu Island, British Columbia. 

 Coast region of British Columbia, western Washington, west- 

 ern Oregon and northwestern California to Humboldt Bay. 



Zapus trinotatus alleni Elliott. (For J. A. Allen.) 



ALLEN JUMPING-MOUSE. 



Similar to trinotatus; dorsal band less black; skull smaller 

 with small audital bullae ; tip of tail sometimes white. The autum- 

 nal pelage appears to be the same as that of summer. Size of 

 trinotatus. 



Type locality, Pyramid Peak, Eldorado County, California. 



