In San Jacinto Valley of east Riverside county 



Dipodomys stephensi (Merriam) San Jacinto Kangaroo Rat 



90. In western and central Cal. and northward into Oregon; northern sub' 



species with a white tail tuft 



Dipodomys heermanni Le Conte Heermann Kangaroo Rat 

 In southeastern Cal. or eastward 91. 



91. Light buff, with no dark facial markings; total length about fourteen 



inches; adjoining areas of Cal. and Nevada 



Dipodomys deserti Stephens Desert Kangaroo Rat 

 Darker, with dark facial markings and some black hairs on body 92. 



92. About twelve to fourteen inches long; tail usually white-tipped; Ariz. 



to Texas 



Dipodomys spectahilis Merriam Banner-tailed Kangaroo Rat 

 About nine to ten inches long; tail usually dark tipped 93. 



93. In the San Joaquin Valley, Cal.; dark tail stripes (dorsal and ventral) 



narrower than the light lateral tail stripes 



Dipodomys nitratoides (Merriam) Short-nosed Kangaroo Rat 

 In the Mohave Desert and westward into Texas; dark tail stripes wider 

 than the light ones 



Dipodomys merriami Mearns Merriam Kangaroo Rat 



94. Base of tail slimmer than central part; soles of hind feet thickly haired; 



body heavy; head large; found in the arid section where Oregon, 



Nevada and Cal. meet Kangaroo Mice 95. 



Base of tail stouter than central section; soles of hind feet bare to half 



haired; body slender and mouse-like Pocket Mice 96. 



95. Upper parts dark; end of tail dark; fur behind ears brownish 



Microdipodops megacephalus Merriam Brown Kangaroo Mouse 

 Upper parts light; tail more uniformly colored; fur behind ears white 

 Microdipodops pallidus Merriam Pale Kangaroo Mouse 



96. Fur coarse, with stiff or spiny bristles; soles of hind feet usually bare 



(Subgenus Chaetodipus) 97. 



Fur soft, without bristles; soles of hind feet usually hairy behind 



(Subgenus Perognathus) 103. 



97. Tuft on end of tail less than three-eighths of an inch long 98. 

 Tuft on end of tail usually over one-half an inch long 99. 



98. Tail longer than head and body; Ariz, to Cal. 



Perognathus haileyi Merriam Bailey Pocket Mouse 

 Tail about one-half total length; plains states to the Rockies 

 Perognathus hispidus Baird Stiff -haired Pocket Mouse 



99. Bristles coarse but not spiny; Cal. to Texas 



Perognathus penicillatus Woodhouse Desert Pocket Mouse 

 Bristles spiny 100. 



100. Ears elongate; Cal. 



Perognathus calif ornicus Merriam California Pocket Mouse 

 Ears round 101. 



101. Stripe along side obscure or absent; southern Cal. 



514 



