98 PEROGNATHUS. HETEROMYS. 



Color. Head and upperparts buff, heavily lined with black, dark- 

 est on lower back; entire underparts and inner side of limbs white; 

 outer side of limbs like upperparts; hands and feet white; tail above 

 dusky including the pencil; beneath white. Ex type in American 

 Museum of Natural History. 



Measurements. Total length, 172; tail, 93; hind foot, 24. Skull: 

 Occipito-nasal length, 26; Hensel, 17.5; zygomatic width, 13; inter- 

 temporal width, 6.5; length of nasals, 9.6; length of upper molar 

 series, 3.9; length of mandible, 11.4; length of lower molar series, 

 3.7. Ex type in American Museum of Natural History. 



Perognathus spinatus magdalense Osgood. 



Perognathus spinatus magdalence Osgood, Proc. Biol. Soc. Wash., 

 XX, 1907, p. 21. 



Type locality. Magdalena Island, Lower California,- Mexico. 



Genl. Char. Similar to P. s. peninsula; mastoids smaller; ros- 

 trum longer. 



Color. Like P. s. peninsula but more vinaceous; upperparts fawn 

 color lined with dusky; narrow lateral line fawn color; underparts 

 creamy white. Ex type in United States National Museum. 



Measurements. Total length, 188-200; tail vertebrse, 110-122; 

 hind foot, 23.5-25. Skull: Greatest length, 26.4; basilar length, 

 17.9; mastoid width, 12.6; zygomatic width, 12.8; interorbital con- 

 striction, 6.9; nasals, 10.5; interparietal, 8.1 X 3.6; maxillary tooth- 

 row, 4.3. Ex type in United States National Museum. 



Genus Heteromys (99). Spiny Pouched Rats. 



Subgenus Heteromys. 



Heteromys zonalis Goldman. 



Heteromys zonalis Goldm., Smith. Misc. Coll., LVI, 1912, No. 36, 

 p. 9. 



Type locality. Rio Indio, near Gatun, Canal Zone, Panama. 



Genl. Char. Similar to H. desmarestianus but darker, with the 

 slender hairs on back paler; no lateral line ; skull heavy. 



Color. Upperparts blackish; flanks and outer side of limbs 

 mouse-gray; underparts, inner side of limbs, the line on hind legs 

 going to the metatarsus, cream-buff; hands and feet buff; tail above 

 blackish, below whitish at base, brownish all around. Ex type in 

 United States National Museum. 



Measurements. Total length, 263; tail, 134; hind foot, 35. Skull: 



