HETEROMYS. 371 
breadth of interparietal, 8; length of interparietal, 4.1; length of 
upper molar series, 4.7.”’ 
378. gaumeri (Hetcromys), Allen & Chapman, Bull. Amer. Mus. Nat. 
EUse.. 1807, Pp. 9: 
GAUMER’S SPINY Rat. 
Type locality. Chichen Itza, Yucatan, Mexico. 
Geogr. Distr. Yucatan, Mexico. 
Genl. Char. Size large; premaxille and nasals terminating equally. 
Color. Above dark smoke gray; sides lighter, fulvous; lateral 
line and outer surface of fore legs orange ochraceous; outer surface 
of hind legs like back; under parts and inner surface of limbs white; 
ears dusky with white edges; tail crested and tufted, dusky above, 
grayish white below; middle of dorsal surface covered with spines 
which are whitish at base, black apically, and mixed in with orange 
ochraceous hairs. 
Measurements. Total length, 292; tail vertebra, 162; hind foot, 
and claw, 32; ear from notch, 14.5. Skull: basal length, 31; greatest 
length, 37; greatest breadth, 16; interorbital breadth, 10.5; length 
of nasals, 16; length of interparietal, 11; palatal length, 20; upper 
tooth row, 5. 
379. annectens (Heteromys), Merr., Proc. Biol. Soc. Wash., xv, 
1902; p, 43. 
ALLIED SPINY Rat. 
Type locality. Pluma, State of Oaxaca, Mexico. 
Genl. Char. Size medium; tail long; skull similar to that of 
H. gaumeri, but ‘smaller, narrower interorbitally, with more 
abruptly spreading zygomata and smaller interparietal.’’ Hind foot 
6-tuberculate. 
Color. Upper parts blackish brown; lateral line fulvous; under 
parts, hands, and feet white, the latter sometimes ‘‘clouded’’; tail 
above dusky, beneath whitish, except tip, which is all dark. 
Measurements. Total length, 300; tail vertebre, 165; hind foot, 33. 
380. hispidus (Heteromys), Allen, Bull. Amer. Mus. Nat. Hist., 1897, 
p- 56. 
Hispip Spiny Rar. 
Type locality. Compostella, Territorio de Tepic, Mexico. 
Geogr. Distr. Territorio de Tepic, Mexico. 
Genl. Char. Pelage soft; soles 6-tuberculate, hairy. 
Color. Upper parts reddish brown, mixed with black-tipped 
bristles; under parts and feet white; lateral line reddish fulvous; 
tail above pale brown, beneath lighter. 
