1905.] NATURAL SCIENCES OF PIIILAUELrHIA, 



679 



be caught at the same entrance on successive nights. They are closely 

 associated with the kangaroo rats in these colonies. Judging by the 

 lack of specimens on coldest nights, I judge there is a short period of 

 intermittent hibernation in February." 



Dipodomys merriami arenivagus Elliot. San Felipe Kangaroo Rat. 



Three specimens from the Cocopahs. These seem to be referable 

 to Elliot's race, though whether it is really separable from simiolus I 

 am in doubt. 



"All three were taken at the mouth of the same sand burrow at tlio 

 base of Mount Major, near camp. This and a large white species, 

 probably deserti Stephens, are said by the guides to abound in the 

 sand plains on the borders of the delta all the way to Calexico. ^ If so, 

 this would indicate a continuous distribution toward the habitat ot 

 simiolKs in the Mojave Desert. I doubt the separability of arenivogusr 



Lepus arizonae Allen. Arizona Hare. 



One example from the Colorado river, near the Mexican boundary 

 line, and another from New river, twelve miles from Calexico. 



"A bottom-land species, not abundant because of the overabundance 

 of coyotes." 



Pipistrellus hesperus (Allen). Western Bat. 



One obtained in the Cocopah Mountains, February 21, identified by 

 Mr. J. A. G. Rehn. The margins of the interfemoral membrane as well 

 as the inner portion of the wing margin is whitish. 



Procyon pallidus :^Ierr. Pallid Raccoon. 



A specimen from the mouth of the Hardy river and one from tlie 



Colony. 



"Coons occur everywhere along the river." 



TJrocyon littoralis (Baird). Coast Fox. 



A skull from nine miles west of Bruce's ranch; also a mummified 

 skeleton from :\Iount Major which could not be preserved. 



Canis estor Merriam? Coyote. 



Five skulls and four skins, which seem to be referable to this form; 

 but without topotypes for comparison, it is impossible to satisfactorily 

 identify them. That three species of coyotes occur together iu the 

 San Pedro Martir Mountains, as stated by Mr. Elliot, seems to me very 



unlikely. 



"Mr. Wilder, whose experience with coyotes extends over a wide 

 territory in the far West, told me he never heard the like of those which 



