HETEROMYS. 371 



breadth of interparietal, 8; length of interparietal, 4.1; length of 

 upper molar series, 4.7." 



378. gaumeri (Hctcromys), Allen & Chapman, Bull. Amer. Mus. Nat. 



Hist., 1897, p. 9. 

 GAUMER'S SPINY RAT. 



Type locality. Chichen Itza, Yucatan, Mexico. 



Geogr. Distr. Yucatan, Mexico. 



Genl. Char. Size large; premaxillae 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 vertebrae, 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, n; palatal length, 20; upper 

 tooth row, 5. 



379. annectens (Hetcromys), 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 vertebrae, 165 ; hind foot, 33. 



380. hispidus (Heteromys), Allen, Bull. Amer. Mus. Nat. Hist., 1897, 



p. 56. 

 HISPID SPINY RAT. 



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. 



