460 CALIFORNIA ACADEMY OF SCIENCES. 



lachiymals decidedly larger; posterior ends of nasals and 

 premaxillary together forming a deep emargination. Total 

 length of skull, 25; mastoid breadth, 12. (In spi)i at iis 

 the length is 23.5, while the mastoid breadth remains the 

 same, 12.) 



Perognathus spinatus peninsulae subsp. nov. 



Type from San Jose del Cabo, Peninsula of Lower 

 California. No. 274 6 yg. ad. Collection of California 

 Academy of Sciences. Collected September 11, 1891, 

 by Walter E. Bryant. Original number, 460. 



Measurements (taken in flesh). — Type: Total length, 

 198; tail vertebrae, 107; hind foot, 23. Ear from anterior 

 base, 9 (in dry skin). 



Average measurements of three specimens from type 

 locality: Total length, 195; tail vertebra?, 108.6; hind 

 foot, 24. 



General characters. — Similar to C. spinatus but con- 

 siderably larger, with much larger ears, and coarser 

 pelage [pelage less coarse than in hryanti'\ ; rump spines 

 as in spinatus; tail slender and sparsely crested as in 

 spinatus — not heavily crested as in bryanti. 



jfjll Color. — Upper parts drab-gray heavily 



I hi lined with black hairs, and becoming brown- 



i ;'\ ish in worn pelage; under parts and feet 



/yl/^'-m^ white; tail bicolor, dusky above, white be- 



if;/" "''"' 'ml "^^^^"^• 



ii A-~Ji^-i\ I Cranial characters. — Skull similar to that 

 W •' JjiM of ^/''"'^'''^'''^^ but very much larger (total length 

 i . aP 28 instead of 23.5), flatter, with angles of 



^^'^^^w interparietal usually more rounded. 



Fig. 3. 1'. piiiiimulit. 



Note.— This animal is sufficiently different from spi- 

 natus to merit full specific recognition except for the fact 



