114 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



Contrasted with M. daricnsis this species seems to be smaller. It 

 is similar in the general character of its pelage, but differs otherwise 

 in about the same characters as M. cavator. 



Specimens examined: Bugaba. 6* (including type). 



Family HETEROMYIDAE. Pocket Mice 



The pocket mice are small rodents at once distinguishable by the 

 deep external cheek pouches in combination with spiny or bristly 

 pelage. In the character of the pelage they are not very unlike the 

 Murine genus Neacomys, but the cheek pouches are distinctive. Two 

 genera, Heteromys and L'unnys, inhabit the region under review. 



Subfamily HETEROMYINAE. Pocket Mice 

 Genus HETEROMYS Desmarest. Pocket Mice 

 Externally the pocket mice of this genus closely resemble those 

 of the genus Liomys, but are more blackish, less grayish in the color 

 of the upper parts, and the sole of the hind foot in the Panama forms 

 is naked to the heel. The generic characters are exhibited by the 

 skull, the dentition being more complex, the interpterygoid fossa 

 V-shaped instead of U-shapcd, and the angle of the mandible much 

 less strongly everted than in the genus Liomys. 



Subgenus HETEROMYS Desmarest 

 HETEROMYS AUSTRALIS CONSCIUS Goldman 



Cana Pocket Mouse 



[Plate 25, figs. 4, 4a] 



Heteromys australis conscius Golkman, Smiths. Misc. Coll., Vol. 60, No. 22, 

 pp. 8-9, February 28, 1913. Type from Cana, eastern Panama (altitude 

 2,000 feet). 



H. a. conscius is a small form of the genus, a rather slightly 

 differentiated northern oft'shoot of the Ecuadorean species H. aus- 

 tralis, which belongs to the Heteromys anomalus group. It is 

 similar externally to some of the other forms of the region, but the 

 cranial characters are distinctive. It is darker in general color than 

 H. a. australis, and the slender hairs among the bristles on the back 

 are grayer than in H. a. lomitensis, a closely allied Colombian form. 

 The skull is more elongated, with broader ascending branches of 

 premaxillae than that of H. a. australis; from that of H. a. lomitensis 

 it dift'ers in the broader upper surface of the maxillary arm of the 



* Collection Mus. Comp. Zool. 



