FIELD BOOK OF MAMMALS 



ings better developed, white at base of ear reduced ; "ankles " 

 generally dusky. Total length, 6-7 inches; tail vertebrae, 

 2.4-3.3 inches; hind foot, .78-88 inch. Found in "Great 

 Basin region in general. Northern Sonora, southern and 

 western Arizona and Utah, exclusive of the higher moun- 

 tains, . . . southern and eastern California east of the 

 Sierra Nevada and the San Bernardino and associated 

 ranges, practically all of Nevada, and parts of southeastern 

 Oregon and south-central Idaho." (Osgood) 



San Clemente Island White-footed Mouse. — Peromysciis 

 maniculatiis dementis (Meams). 

 Resembling gambeli but slightly larger and darker; lateral 

 line ochraceous buff, better defined. Total length, 6.2- 

 6.9 inches; tail vertebras, 2.7-3.1 inches; hind foot, .8-.86 

 inch. Found only on the following islands of the Santa 

 Barbara group, ofT coast of southern California, — San Cle- 

 mente, San Nicolas, Santa Rosa, and San Miguel. 



Catalina White-footed Mouse. — Peromysciis maniculatus cata- 

 lincB (Elliot). 

 "Similar to P. m. dementis, but larger; ears larger; tail 

 longer and coarser; skull larger and heavier. Color. — • 

 AJDout as in P. in. dementis; slightly darker and more vin- 

 aceous than in P. m. gambeli." Total length, 6.4-S.6 

 inches; tail vertebrse, 3.5-4.2 inches; hind foot, .84-92 

 inch. Found on "Santa Catalina and Santa Cruz islands, 

 Santa Barbara group, off the coast of southern California." 

 (Osgood) 



Sicka White-footed Mouse. — Peromysciis sitkensis sitkensis 

 Merriam. 

 Resembling in color and general appearance maniculatus 

 hylccus, but much larger, with largest skull of the group 

 found north of Mexico. "Worn pelage: Sides rich russet 

 or Mars brown, shading on dorsum to Prout brown and 

 sometimes burnt uTnber; dusky markings about face, fore- 

 arms, and "ankles" well developed; very little or no white 

 at anterior bases of ears." Total length, 9 inches; tail 

 vertebrse, 4.5 inches; hind foot, 1.06 inches. Found on 

 "Baranof and Chichagof islands, Alaska." (Osgood) 



Prevost Island White-footed Mouse. — Peromysciis sitkensis 

 prevostensis (Osgood). 

 "Similar to sitkensis, but with slightly shorter tail and 

 slight cranial characters. Somewhat similar to macrorhiniis, 

 but hind foot longer and tail shorter; skull decidedly larger 

 and heavier. Color. — Similar to sitkensis and macrorhiniis, 

 but averaging slightly darker. Sides rich Mars brown shad- 

 ing into a broad irregular area of mummy-brown on dor- 

 sum." Total length, 8.2-9.2 inches; tail vertel)r«, 3.9-4.6 

 inches; hind foot, i.i inches. Found on "Prevost Island, 

 Queen Charlotte Group, British Columbia." (Osgood) 



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