PEROGNATHUS. 309 



Measurements. Total length, 195; tail vertebrae, 114; hind foot, 

 23; ear, 11. Skull: total length, 21; Hensel, 18; zygomatic width, 

 13; interorbital constriction, 7; mastoid width, 14; greatest parietal 

 width, 10.5; length of nasals, 9.4; palatal length, 10; length of upper 

 tooth row, 4; length of mandible, 12.5 ; length of lower tooth row, 3.5. 



Subgenus B. Chaetodipus. 



764. Perognathus baileyi Merriam. 



Perognathns baileyi Merr., Proc. Acad. Nat. Scien. Phil., 1894, 

 p. 262, fig. I. Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 

 1901, p. 251. Zool. Ser. hi. Mamm. Middle Amer. 8z W. In- 

 dies, F. C. M. Pub., IV, Pt. I, 1904, p. 361. Zool. Ser. 

 Bailey's Pocket Mouse. 



Type locality. Magdalena, State of Sonora, Mexico. 

 Geogr. Distr. South central Arizona, south into the State of 

 Sonora and Lower California, Mexico. 



((. PfTodiifitliufi hfiilpyi rhjidinnrhis Elliot. 



Perognathus baileyi rhydinorhis Elliot, Pub. Field Columb. Mus., 

 Ill, 1903, p. 167. Zool. Ser. Id. Mamm. Middle Amer. & W. 

 Indies, F. C. M. Pub., iv, Pt. i, 1904, p. 362. Zool. Ser. 

 San Quentin Pocket Mouse. 



Type locality. San Quentin, Lower California, Mexico. 

 Geogr. Distr. West coast of Lower California, Mexico, in the 

 vicinity of San Quentin. 



765. Perognathus cnecus Elliot. 



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

 p. 169. Zool. Ser. Id. Mamm. Middle Amer. & W. Indies, 

 F. C. M. Pub., IV, Pt. I, 1904, p. 362. Zool. Ser. 



BuFF-COLORED PoCKET MoUSE. 



Type locality. Rosarito, San Pedro Martir Mountains, Lower 

 California, Mexico. 



Geogr. Distr. Known only from the type locality. 



766. Perognathus hispidus Baird. 



Perognathus fasciatus Baird, N. Am. Mamm., 1857, p. 420. (nee 



Max.) 

 Perognathus hispidus Baird, N. Am. Mamm., 1857, p. 421. 

 Perognathus paradoxus spilotus Merr., N. Am. Faun., No. i, 1889, 



p. 25. 

 Perognathus hispidus Elliot, Syn. N. Am. Mamm.. F. C. M. Pub., 



II, 1901, p. 251. Zool. Ser. Id. Mamm. Middle Amer. & W. 



Indies, F. C. M. Pub., iv, Pt. i, 1904, p. 360. Zool. Ser. 



