31'2 perognathus. 



Eastern Desert Pocket Mouse. 



Type locality. Fort Hancock, El Paso County, Texas. 



Geogr. Distr. Western Texas south to north central Mexico east 

 of the Sierra Madre, to La Ventura, State of Coahuila. 



d. rcrogiKitliHH jjciiiciLLdfits (( rciKd'ius (Merriam). 



Perognatfms arenarius Merr., Proc. Cal. Acad. Scien., 2d Ser., iv, 



1894, p. 461. 

 Perognathus penicillatus arenarius Elliot, Mamm. Middle Amer. & 

 W. Indies, F. C. M. Pub., iv, Pt. i, 1904, p. 358. Zool. Ser. 

 Little Desert Pocket Mouse. 



Type locality. San Jorge, near Comondu, Lower California, 

 Mexico. 



Geogr. Distr. East coast of Lower California. 



768. Perognathus helleri Elliot. 



Perognathus helleri Elliot, Pub. Field Columb. Mus., iii, 1903, 

 p. 166. Zool. Ser. Id. Mamm. Middle Amer. & W. Indies, 

 F. C. M. Pub., IV, Pt. I, 1904, p. 360. Zool. Ser. 

 Heller's Pocket Mouse. 



Type locality. San Ouentin, Lower California, Mexico. 



Geogr. Distr. Known only from the type locality. 



769. Perognathus Stephens! Merriam. 



Perognathus stephensi Merr., Proc. Acad. Nat. Scien. Phil., 1894, 

 p. 267. Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 1901, 

 p. 253. Zool. Ser. 

 Stephens' Pocket Mouse. 



Type locality. Mesquite Valley, northwest arm of Death Valley, 

 Inyo County, California. 



Geogr. Distr. Known only from the type locality. 



770. Perognathus pernix Allen. 



Perognathus pernix Allen, Bull. Am. Mus. Nat. Hist. N. Y., 1898, 

 p. 149. Elliot, Mamm. Middle Amer. & W. Indies, F. C. M. 

 Pub., IV, Pt. I, 1904, p. 359. Zool. Ser. 

 SiNALOA Pocket Mouse. 



Type locality. Rosario, State of Sinaloa, Mexico. 



Geogr. Distr. States of Sinaloa and Jalisco, Mexico. 



a. Perognathus pernix rnstratus Osgood. 



Perognathus pernix rostratus Osgood, N. Am. Faun., No. 18, 1900, 

 p. 51. Elhot, Mamm. Middle Amer. & W. Indies, F. C. M. 

 Pub., IV, Pt. I, 1904, p. 359. Zool. Ser. 



