MURID^ 105 



feet and lower parts white; tail bicolor, dusky or brownish above; 

 remainder white. 



.Length about i8o mm. (7.10) inches); tail vertebrae 82 

 (3-25); hind foot 21 (.83); ear from crown 16 (.63). 



Type locality, Mojave Desert near Hesperia, California. 



Desert Mice are common in the arid regions of northeast- 

 ern Lower California, southeastern California, southern Ne- 

 vada, southwestern Utah and western Arizona, in all places where 

 they can find food. Like most mammals of this arid region they 

 are independent of water, though probably using it when it is 

 to be had. Like other mice the food is varied. 



The label of one of my skins from^ Salt Creek, Colorado 

 Desert, taken March 29th, bears the notes "contained eight 

 foetuses". I have other foetal notes in April (seven), June (five) 

 and November (five). The habits of this subspecies do not dif- 

 fer materially from those of others of the species. Examples 

 from parts of the San Bernardino and other mountains are very 

 similar to deserticolus and perhaps should be referred to that 

 form. 



Peromyscus texanus dementis Mearns. (Of San Cle- 



mente Island.) 



SAN CLEMENTE MOUSE. 



"Above drab anteriorly, strongly tinged with burnt umber 

 posteriorly ; top of head drab gray ; ears black with faint hoary 

 edging; feet and under surface white; tail sharply bicolored". 



"Length 177 mm. (7 inches) ; tail vertebrae yy (3) ; hind 

 foot 21 (.83); ear 17 (.67)". 



Type locality, San Clemente Island, California. 



I have seen a few Peromyscus from each of the following 

 Islands, Coronado, San Clemente, San Nicolas, and Santa Bar- 

 bara. These agreed in size but differed slightly in shade of 

 color, the Santa Barbara skins being the darkest. 



