MAMMALS 339 



mm. ; hind foot 50 mm. : central prairie region from Saskatchewan into 

 Oklahoma; eastward to Indiana; i litter annually of 4 to 8 each. 



C. spilosoma (Bennett) (Fig. 182). Color reddish brown with 

 ill-delined spots arranged in longitudinal series; under parts yellowish 

 white; ears very short; length 255 mm.; tail 75 mm.; hind foot 32 mm.: 

 southern CaHfornia to Texas. 



Subspecies of C. spilosoma 



C. s. macrospilotus (Merr.). Color dark; spots large and far apart; 

 also with a drab-gray color phase: southern Arizona and New Mexico. 



C. s. major (Merr.). Dorsal spots indistinct: eastern New Mexico 

 and western Texas to Colorado. 



C. s. pratensis (Merr.). Size small; length 197 mm.; colors dark: 

 northwestern Arizona. 



C. s. arens (Bailey). In 2 color phases, a reddish and a gray; spots 

 small: southwestern Texas. 



C. s. annectans (Merr.). Color grayish brown; spots buff: southern 

 coast region of Texas and New Mexico. 



C tereticaudus (Baird). Color grizzled grayish brown, without 

 spots; tail very long; length 248 mm.; tail 112 mm.; hind foot 35 mm.: 

 southern California to southern Arizona. 



C neglectus (Merr.). Like C. tereticaudus but with a much shorter 

 tail; length 200 mm.; tail 74 mm.; hind foot 32 mm.: western Arizona. 



C. cryptospilotus (Merr.). Color pale buff, without spots; length 

 190 mm.; tail 60 mm.; hind foot 32 mm.: Painted Desert, Arizona. 



C. obsoletus (Kennicott). Color light gray, spotted indistinctly; 

 length 212 mm.; tail 62 mm.: Black Hills and western Nebraska; west- 

 ward to Utah. 



C. elegans (Kenn.). Color uniform dusky yellowish brown, with- 

 out spots; length 275 mm.; tail 67 mm.; hind foot 46 mm.: Wyoming, 

 northern Utah and northwestern Colorado; Transition and Upper 

 Sonoran zones. 



C. armatus (Kenn.). Color uniform dark gray, without spots; 

 length 275 mm.; tail 62 mm.: Utah, Wyoming, Idaho and Montana. 



C. richardsonii (Sab.). Similar to C. elegans, but paler: North 

 Dakota and Montana; Canada. 



C. columhianus (Ord). Color yellowish brown, with many white 

 blotches; length 370 mm.; tail 102 mm.; hind foot 55 mm.: western 

 Montana to Washington. 



C. mollis (Kenn.). Color dusky yellowish brown, without spots; 

 ears rudimentary; length 208 mm.; tail 45 mm.: Utah and Nevada. 



