204 SIGMODON. 
PAGE 
b:” Above yellowish oray sc. cee eas S. h. eremicus 227 
c.”” Above buffy gray and black... .%.: S. h. berlandiert 227 
d.’’ Above light yellowish brown......... S.h. artzone 228 
e.”” Above light. brownish’ gray...) ....-s... S.h. major 228 
b.” Under parts: creamy white... 2.22... < S. h. tonalensis 229 
c.’ Under parts ‘grayish whites.) o.o2en<: 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, ‘eray, cade: black: Uo Ase. ce ere S. minimus 230 
b.’ Under parts white or whitish. 
a." Above dull brownishssray. cts. 4.72 eee S. leucotis 230 
b.”” Above yellowish gray, tinged with 
OCGHSACEOUS! oc. eee eerste eee ie S. ochrognathus 230 
c.’ Under parts pale cinnamon. 
a.’ Above dark ochraceous, or light 
tamer Drowns us one he ok b ebaeio ey eee S. alticola 231 
b:’* Above dull tawieysdray on cctv. ees S..a. amoles 23a 
b. Size large; hind foot over 30 mm. 
ax (Under parts: White, axenic a sash see S. austerulus 231 
b.’ Under parts ochraceous buff............S. fulvivenier 232 
ce.’ Under parts dark rusty ochraceous.......S. melanotis 232 
201. alleni (Sigmodom), 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.) 
hispidus boruce. 
boruce (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 
stad 
