162 CALIFORNIA MAMMAL.S. 



Subfamily Heteromyinae 



Molars rooted; temporal region moderately inflated; inter- 

 parietal large; hind legs not greatly lengthened; size small. 



Genus Perognathus Maximilian. (Pouch — jaw.) 

 Upper incisors narrow, grooved in front ; zygomatic process 

 not greatly expanded in front of the orbit; tail about as long 

 as head and body; hind feet with five toes, the inner toe small, 

 situated but little above the other toes ; soles nearly naked ; pelage 

 sometimes spiny on the rump and sides. 



Subgenus Perognathus. 



Mastoids comparatively large, projecting beyond the plane 

 of the occiput ; pelage soft, without spines or bristles. 



Perognathus. panamintus Merriam. (Of the Panamint 

 Mountains.) 



PANAMINT POCKET-RAT. 



Above grayish buff, often wth a pearl}- appearance caused 

 by the pale buff ground color being overlaid by dark-tipped hairs ; 

 lateral line pale buff, not sharply defined; subauricular spot small 

 and inconspicuous ; fore legs buffy or white ; under parts white ; 

 tail, above dusky, darkest toward tip, below buff or whitish; 

 pelage long, full and silky. 



Length alx)ut 143 mm. (5.63 inches) ; tail vertebrae 78 

 (3.07); hind foot 20 (.78). 



Type locality, Perognathus Flat, (alt. 3,200), Panamint 

 Mountains, California. 



Panamint Mountains, California, eastward to St. George, 

 Utah. 



In April, 1891, Mr. Bailey and I found Panamint Pocket- 

 Mice abundant in the type locality, which is a small sandy plain 

 in the northern part of the Panamint Mountains, having a moder- 

 ate growth of small shrubs and some grass. 



