42 EPINOMYS. ONYCHOMYS. 



Epinomys rattus (Linnaeus). 

 Epinomys norwegicus (Erxleben). 

 Epinomys alexandrinus (E. Geoffroy). 



Subfamily Cricetinae. 

 Genus Onychomys (59). 



Onychomys torridus clarus Hollister. 



Onychomys torridus clarus Hollister, Proc. Biol. Soc. Wash., XXVI, 

 1913, p. 215. 



Type locality, Keeler, Inyo County, California. 



Gent. Char. Like O. t. longicaudus but brighter colored and with 

 very little dark streaking above. Anterior palatine foramina reaching 

 to anterior line of first .molars. 



Color. Head pinkish cinnamon; cheeks, white; upperparts bright 

 pinkish cinnamon, hairs with subapical buff band; underparts, limbs, 

 hands and feet white, under-fur neutral gray; grayish brown on upper 

 side of tail for two-thirds its length, remainder above and below white. 

 Ex type in United States National Museum. 



Measurements. Total length, 143; tail, 51; hind foot, 20.5; ear, 

 15.7. Skull: Occipito-nasal length, 25; Hensel, 18.5; zygomatic 

 width, 13.2; intertemporal width, 5 ; length of nasals, 9 6 ; breadth of 

 braincase, n.6; length of upper molar series, 3.5; length of mandible, 

 11.4; length of lower molar series, 3.4. Ex type in United States 

 National Museum. 



Onychomys leucogaster capitulatus Hollister. 



Onycomys leucogaster capitulatus Hollister, Proc. Biol. Soc. Wash., 

 XXVI, 1913, p. 215. 



Type locality. Prospect Valley, Hualpai Indian Reservation, 

 Grand Canon, Arizona. Altitude, 4500 feet. 



Genl. Char. Like O. 1. ruidosa but darker. Skull smaller. 



Color. Upperparts mixed cinnamon and black, the latter color 

 most prominent on lower back and rump; cheeks paler cinnamon; 

 flanks like back; underparts and limbs, hands and feet white; tail 

 dark brown on basal half above, beneath white. Ex type in United 

 States National Museum. 



Measurements. Total length, 142; tail, 43; hind foot, 21; ear, 

 14.6; Skull: Occipito-nasal length, 29.1; Hensel, 20.6; zygomatic 

 width, 14; intertemporal width, 4.7; breadth of braincase, 13; length 

 of nasals, 9.2; length of upper molar series, 3.8; length of mandible, 



