1912.] Townsend, Mammals from Lower California. 121 



Sides of body and outside of legs much darker and more iron gray than malleni. 

 Rump patch darker and less differentiated from color of back. Iron gray of sides 

 extending on underparts, leaving only a narrow median white area. Under side of 

 neck more buff, ears darker and grayer. Top of head very similar to alleni. 



Type, Xo. 31990. male. Represented by three males in rather worn spring pelage, 

 Tiburon Island, April 13. 



A dozen or more of these rabbits were seen by our party. Measurements, 

 average of three specimens: total length, 610; tail, 63, hind foot 127. 



Heteromyid.e. Pocket Mice, Kangaroo Rats, etc. 



Pocket mice of the genus Perognaihus are naturally abundant in the 

 desert-like country of Lower California, and were obtained at all localities 

 where the traps were set at night. 



There were signs that they were quite as common on the islands as on 

 the Peninsula. They are burrowers, nocturnal in habit, and feed on seeds 

 which they collect and carry in their cheek pouches. 



13. Perognathus penicillatus arenarius Merriam. Little Desert 



Pocket Mouse. 



Male, San Bartolome Bay, March 14; male San Francisquito Bay, 

 April 10. 



14. Perognathus spinatus peninsulae Merriam. Cape San Lucas 



Pocket Mouse. 



Seven males, 3 females, Cape San Lucas, March 24; 5 males, San Jose 

 del Cabo, March 26; 2 males and 2 females, Pichilinque Bay, March 28-30; 

 male, Agua Verde Bay, April 2; male and female, Mulege, April 5; male, 

 Concepcion Bay, April 8; 3 males, Miraflores, April 25; female, San Ber- 

 nado Mountains, May 5. 



15. Perognathus penicillatus siccus Osgood. 

 Male, 2 females, Cape San Lucas, March 24. 



16. Perognathus baileyi rhydinorhis Elliot. San Quentin Pocket 



Mouse. 



Two males and 3 females, Pichilinque Bay, March 29-30; male, Concep- 

 cion Bay, April 8. 



