Ocmis Cratof/eoniys 



Size lai'ji,'(', r('.s(;iriblin<»' Geomys, but upper incisors liavc only 

 one longitudinal groove. 

 Colorado Species. 



Cliestnut-faeed Pocket-Gopher, Cratofjromys castanops cast- 

 anops. 



We have no records of the distribution of tliis pocket goplier, 

 but Warren reports it from Bent, Prowers, l^as Animas, Pueblo 

 and Baca Counties. 



FAMILY HETEROMYIDAE 



Pocket-mice and kangaroo-rats belong to this family, both 

 iiaving' external cheek pouches like the Geomyidae. Tail and hind 

 legs elongated. Except to the naturalist, pocket-mice are prob- 

 ably the least known of all our rodents, and this is also true, to a 

 large extent, of kangaroo-rats. It is a common belief with some 

 ranchmen that kangaroo-rats have an abdominal pouch like the 

 opossum and kangaroo in which to carry their young, but this is 

 not a fact. 



Genus Perognathus (Pocket-Mice) 



Pocket-mice are related to the kangaroo-rats, but the hind 

 limbs and tail are of a moderate length. Coloration similar to 

 kangaroo-rats, but underparts tend to bluffy, pelage coarse; size 

 medium to small; cheek pouches external and large. 



Fig. 8. Pocket Mouse (Perognathus paradoxus). From a specimen taken 

 near Ft. Collins, October 18th. Original. M. A. Palmer. Delineator. 



Colorado Species. 



Buff -bellied Pocket-Mouse, Perognathus fasciaius infrahiteus. 

 Plains Pocket-Mouse, Perognathus flavesceus flavesceiis. 

 Apache Pocket-Mouse, Perognathus apache apache. 

 Baird's Pocket-Mouse, Perognathus flavus flavus. 

 Kansas Pocket-Mouse, Perognathus hispidus paradoxus. 



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