SIGMODON. 229 



breadth, 16.4; alveolar length of upper molar series, 7.3. (Bailey, 

 I.e.) 



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



1902, p. 109. 

 TONALA COTTON RAT. 



Type locality. Tonala, State of Chiapas, Mexico. 



Geogr. Distr. Eastern part of State of Oaxaca, into western part 

 of State of Chiapas. 



Genl. Char. Similar to S. mascotensis, but larger. 



Color. Above yellowish brown; beneath creamy white; feet and 

 tail dull brownish gray. 



Measurements. Total length, 350; tail, 166; hind foot, 41. 

 Skull: basal length, 34.5; nasals, 15; zygomatic breadth, 22; mastoid 

 breadth, 14.5; alveolar length of upper molar series, 6.8. 



FIG. XXXVIII. SIGMODON H. INEXORATUS. OCOTLAN COTTON RAT. 



hispidus inexoratus (Sigmodon], Elliot, Pub. Field Columb. Mus., 



in, 1903, p. 144. Zoology. 

 OCOTLAN COTTON RAT. 



Type locality. Ocotlan, State of Jalisco, Mexico. 



Genl. Char. Size large. Skull with infraorbital foramina oblong 

 and narrow; frontal region broad. 



Color. Above mixed creamy buff and black; sides paler cream 

 buff, as are also the arms, hands, and thighs; hind feet gray; under 

 parts grayish white; tail nearly naked, blackish above, whitish 

 beneath; ears dark brown or blackish. 



Measurements. Total length, type, 310"; tail vertebras, 146; 

 hind foot, 36. Skull: total length, 37; Hensel, 31; zygomatic width, 

 20; mastoid width, 15; median palatal length, 8; length of incisive 

 foramen, 7 ; upper tooth row, 7 ; lower tooth row, 7. 



