MAMMALS 329 



£2 Color bxiff. 



gi Length about 130 mm P. flavescens. 



g2 Length under 120 mm P. merriami. 



62 Tail about 50 mm. long P. flavus. 



d-z In the States of the Mexican border P. apache. 



C2 Tail longer than the head and body. 



di In southern California and Nevada: P. panamintinus. 



d2 In the San Joaquin Valley P. longimembris. 



ds In the Great Basin P. parvus. 



6.4 On the plains of the Columbia P. lordi. 



bo Tail long and heavily crested P. formosus. 



ao Fur harsh, usually with spiny bristles on the rump; soles of 

 hind feet naked; tail very long and terminating with a 

 penicUlate tuft (except P. hispidus). 

 bi Fur without bristles. 



Ci Tail not crested, shorter than or equal to the head and 



body P. hispidus. 



C2 Tail crested, longer than the head and body P. penicillatus. 



hi Fur with spiny bristles. 

 Ci Ear rounded. 



di In Arizona to Texas P. intermedius. 



6.2 In southern California P. fallax. 



C2 Ear elongate. 



di Near San Diego P. femoralis. 



d2 In central and southern California P. calif orniciis. 



P. Jasciatus Wied. Color olivaceous; pure white below; fur soft; 

 soles of feet hairy; length 134 mm.; tail 64 mm.; hind foot 17 mm.: 

 eastern Montana and Wyoming and western Dakota; Upper Sonoran 

 and Transition zones. 



P. flavescens Merriam. Color buff; white below; feet and legs white; 

 length 129 mm.; tail 61 mm.; hind foot 17 mm.: South Dakota to northern 

 Texas; Upper Austral plains. 



P. merriami Allen. Color ochraceous buff; belly, feet and fore 

 legs white; length 116 mm.; tail 57 mm.; hind foot 16 mm.: central and 

 southern Texas. 



P. flavus Baird. Color pinkish buff; pure white below; fur very 

 soft; length 112 mm.; tail 50 mm.; hind foot 15 mm.: eastern Colorado 

 and western Nebraska to Mexico. 



P. apache Merr. Color rich buff; length 139 mm.; tail 67 mm.; 

 hind foot 18 mm.: eastern Arizona, western New Mexico and southern 

 Utah. 



P. panamintinus Merr. Color grayish buff; underparts white; 

 fur long and silky; length 143 mm.; tail 78 mm.; hind foot 20 mm.: 

 southern California and Nevada. 



