June, 1903. A List of Mammals — Elliot. 221 



idad, 2 Agua San Matias, 3 Head of San Antonio River, 4 Rosarito, 

 1 Rosarito Divide, San Pedro Martir Mts. 



San Matias appears to be the eastern limit of this species in the 

 mountains. 



SUBFAM. HETEROMYIN^E. 



PEROGNATHUS. 



A. Chaetodipus 



Perognathus baileyi rhydinorhis. 



Perognathus baileyi rhydinorhis. Elliot, Pub. Field Columb. 

 Mus., 1903, iii, p. 167. 



14 Specimens: 10 San Quentin, Pacific coast; 3 Agua Joncolito, 

 1 Rosarito, West of San Pedro Martir Mts. 



Perognathus penicillatus angustirostris. 



Perognathus penicillatus angustirostris. Osgood, N. Am. Faun., 

 No. 18, 1900, p. 47, Elliot, Syn. N. Am. Mamm., 1901, p. 252. 



12 Specimens: 1 Buena Vista, 11 San Felipe, Gulf of California. 



The type of this race came from Carriso Creek, Colorado Desert, 

 California, and these Lower California examples are not typical, 

 being paler and with a fulvous tinge on the upper parts. But the 

 difference observable does not warrant any separation of individuals 

 in the various localities. Mr. Heller only met with it in the two 

 places mentioned above, both in desert regions on the east coast, 

 where it associated with the next race, a gradation from one to the 

 other of the two forms being noticeable. 



Perognathus penicillatus arenarius. 



Perognathus penicillatus arenarius. Merr., Proc. Cal. Acad. Scien., 

 1894, iv., p. 461. 



21 Examples, San Felipe, Gulf of California. 



These specimens are referred to P. arenarius, although certain 

 differences in the cranial characters are observable. The unique 

 type of P. arenarius was taken at Comondu, much to the south of 

 San Felipe, and until more examples are obtained and comparison 

 made with northern individuals it will not be possible to know if the 

 determination of these San Felipe specimens is correct or not. 



