HETEEOMYIDjE 155 



Type locality, Carbondale, Mariposa County, California. 

 Western foothills of the Sierra Nevada. 



Perodipus microps Merriam. (Minute — like.) 



INYO POCKET-RAT. 



Small; ears small; above pale bufTy ochraceous; skull small, 

 narrow, with narrow braincase. 



Length a.boat 270 mm. (10.60 inches) ; tail vertebrae 158 

 (6.20) ; hind foot 41 (1.62). 



Type locality. Lone Pine, Inyo County, California. 



Northern part of the Mojave Desert. 



Genus Dipodomys Gray. (Two-footed — mouse.) 

 Hind foot with but four toes, otherwise similar to Perodipus, 

 but varying more in color and size. See under Perodipus for 

 color pattern. 



Dipodomys califomicus Merriam, 



CALIFORNIA POCKET-RAT. 



Very similar to Perodipus goldinoni in color and size; skull 

 similar but narrower interorbitally, nasals narrower; supraoc- 

 cipetal wider; mastoids and audital bulla much smaller. 



Length about 300 mm. (11.80 inches) ; tail vertebras 185 

 (7.80); hind foot 43 (1.70). 



California Pocket-Rats probably occur in all the northern 

 coast Counties. I have taken them in Lake and Mendocino 

 Counties. In the Pacific Railroad Reports, Dr. Suckley says 

 that a "Kangaroo Rat" is common on the Salmon River; this is 

 doubtless the present species. They inhabit brush and forests 

 as well as open land, though probably not living in dense forests. 

 I trapped one among redwoods near an open glade. I did not 

 observe anything peculiar in their habits in other respects. They 

 did not seem to be commion. One trapped in an old vacant house 

 near the end of April, contained three foetuses. 



