ZAPODID^ 175 



or interspersed with groves or shrubs, and some prefer moist 

 locahties. They are most often noticed in mowing the grass of 

 meadows inhabited by them. They are crepuscular and noctur- 

 nal, but are abroad occasionally in the daytime. 



Genus Zapus CouES. (Great — foot.) 

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

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

 crowded ; frontal marrow interorbitally ; ears rather long ; pelage 

 coarse; four pairs of mammae. 



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 buff 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 flecked 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. 



