DIDELPHYS. 15 



48; length of nasals, 46; mastoid breadth, 29.4; palatal length, 52; 

 length of upper molar series, 19. 



a- cozuiiH'/tr (DiJelpliis!), Merr., Proc. Biol. Soc. Wash., xiv, 1901, 



p. 101. 

 ISLAND OF COZUMEL OPOSSUM. 



Type locality. Cozumel Island, Yucatan. 



Genl. Char. Similar to D. yucatancnsis but larger; tail shorter; 

 rostrum and nasals broader; ears large, broad. 



Color. Upper parts black, many long white hairs protruding; 

 beneath dusky with white hairs intermingled; hands and feet black; 

 tail black for two-thirds the length, remainder flesh color; ears black. 



Measurements. Total length, 703; tail vertebras, 324; hind foot, 

 59. (ex Type.) 



FIG. V. DIDELPHYS MESAMERICANA. LINNEAN OPOSSUM. 

 No. 8725 Field Columbian Mus. Coll. 



14. mesamericana, Oken, Lehrb. der Zool., n, 1816, p. 1152. 



californica (Didelphis!) Bennett, Proc. Zool. Soc., 1833, p. 40. 



Elliot, Syn. N. Am. Mamm., 1901, p. 3. 

 LIXNEAN. OPOSSUM. 



Type locality. "Northwestern Mexico, adjacent to California." 



Geogr. Distr. Oklahoma Territory, through Mexico generally into 

 Gautemala. 



Genl. Char. Black; toes reddish half way from claws. 



