224 SIGMODON. 



PAGE 



b." Above yellowish gray S. h. ercmicus 227 



c." Above buffy gray and black S. h. berlandieri 227 



d." Above light yellowish brown S. h. arizona 228 



e." Above light brownish gray 5. h. major 228 



b.' Under parts creamy white 5. h. tonalcnsis 229 



c.' Under parts grayish white S. h. inexoratus 229 



B. Tail well haired. 



a. Size small; hind foot less than 30 mm. 



a.' Under parts pale buff; above mixed 



brown, gray, and black S. minimus 230 



b/ Under parts white or whitish. 



a." Above dull brownish gray 5. leucotis 230 



b." Above yellowish gray, tinged with 



ochraceous 5. ochrognathus 230 



c/ Under parts pale cinnamon. 



a." Above dark ochraceous, or light 



umber brown S. alticola 231 



b." Above dull tawny gray 5. a. amoles 231 



b. Size large; hind foot over 30 mm. 



a/ Under parts white 5. austerulus 231 



b.' Under parts ochraceous buff S. fuLviventer 232 



c.' Under parts dark rusty ochraceous 5. mclanotis 232 



201. alien! (Sigmodon}, Bailey, Proc. Biol. Soc. Wash., xv, 1902, p. 112. 

 ALLEN'S COTTON RAT. 



Type locality. San Sebastian, Mascota, State of Jalisco, Mexico. 



Geogr. Distr. Western part of State of Jalisco, and southern part 

 of Province of Tepic, Mexico. 



Genl. Char. Hands, feet, and tail slender; colors bright. 



Color. Above dull tawny; beneath white or buffy; hands and 

 feet yellowish brown; tail above black, beneath brownish. 



Measurements. "Average of 8 adults: total length, 244; tail, 

 112; hind foot, 31.6. Skull of type: basal length, 29.3; nasals, 13; 

 zygomatic breadth, 19.3; mastoid breadth, 13; alveolar length of 

 upper molar series, 6.4." (Bailey, 1. c.) 



liispidus borucce. 



boruccB (Sigmodon}, Allen, Bull. Amer. Mus. Nat. Hist., 1897, p. 



40. 

 BORUCA COTTON RAT. 



Type locality. Boruca, Costa Rica. 



Geogr. Distr. Costa Rica, Central America. 



Color. Above yellowish brown, tinged with chestnut and lined 

 with black, paler on the sides; under parts grayish white; limbs like 



