J28 SIGMODON. 



hispidus pallidus Mearns, Proc. U. S. Nat. Mus., 1898, p. 504. 



Elliot, Syn. N. Am. Mamm., 1901, p. 145. 

 BERLANDIER'S COTTON RAT. 



Type locality. Rio Nazas, State of Coahuilla, Mexico. 



Geogr. Distr. Brownsville to El Paso, Texas, and Carlsbad, New 

 Mexico; south to southern part of State of Jalisco, Mexico. 



Genl. Char. Smaller than S. hispidus texensis; ears larger, color 

 paler. 



Color. Above buffy gray, mixed with black; under parts white; 

 feet grayish white; tail dusky brownish above, grayish white beneath. 



Measurements. Total length, 242; tail vertebrae, 103; hind foot, 

 30; ear, 14. Skull: basal length, 30.5; zygomatic breadth, 19; mas- 

 toid breadth, 13.4; length of nasals, 12.3; length of upper molar 

 series, 6.5. 



hispidus arizonce (Sigmodon}, Mearns, Bull. Am. Mus. Nat. Hist., 



1890, p. 287. Elliot, Syn. N. Am. Mamm., 1901, p. 144. 

 ARIZONA COTTON RAT. 



Type locality. Fort Verde, Yavapai County, Arizona. 



Geogr. Distr. Arizona into State of Sonora and Lower California, 

 Mexico. 



Genl. Char. Larger than 5. hispidus; ears larger; tail longer, 

 colors paler. 



Color. Above light yellowish brown, mixed with ashy and lined 

 with black; under parts white; tail dusky above, whitish below. 



Measurements. Average total length, 320; tail vertebras, 121; 

 hind foot, 35-36. Skull: total length, 40; zygomatic breadth, 23; 

 length of nasals, 15.9; length of upper molar series, 7.1. 



hispidus major (Sigmodon), Bailey, Proc. Biol. Soc. Wash., xv, 



1902, p. 109. 

 LARGE COTTON RAT. 



Type locality. Sierra de Choix, 50 miles northeast of Choix, State 

 of Sinaloa, Mexico. 



Geogr. Distr. Province of Tepic to southern part of State of 

 Sonora, Mexico. 



Genl. Char. Very large ; feet stout. Skull heavily ridged in adults ; 

 interparietal strap-shaped, ends rounded; nasals notched posteriorly; 

 audital bullae large, elongated. 



Color. Above light brownish gray; nose yellowish; beneath 

 white; hands and feet light gray; tail above blackish, beneath dark 

 gray. 



Measurements. Total length, 365; tail, 156; hind foot, 40.5. 

 Skull: basal length, 36; nasals, 16; zygomatic breadth, 23.5; mastoid 



