CLASS MAMMALIA. 



Order Marsupialia. Marsupials. 



Family Didelphiidae. Opossums. 

 Genus Chironectes (i). 



1 Chironectes panamensis Goldman. 



Chironectes panamensis Goldman, Smith. Misc. Coll., LXIII, 1914, 



No. 5, p. i. 



Type locality. Cana, eastern Panama. Altitude 2000 feet. 



Geogr. Distr. Guatemala into Colombia. 



Genl. Char. Similar to C. minimus of Guiana in size and color ; 

 but cranial characters different. Braincase longer; lambdoid crest 

 projecting over foramen magnum; nasals longer, ends pointed, sides 

 not constricted; fronto-parietal suture convex posteriorly; sagittal 

 crest developed. 



Color. Pattern as in C. minimus, grayish white, light brown and 

 black; the crescentic band over eyes less distinct; black of forearms 

 extending to first phalanges of the three middle digits; base of tail 

 dark all around; rest like C. minimus. Ex type in United States 

 National Museum. 



Measurements. Total length, 651; tail, 386; hind foot, 72. 

 Skull: Greatest length, 74.2; Hensel, 69.2; zygomatic width, 43.8; 

 intertemporal width, 14.1; length of nasals, 33; palatal length, 45.6; 

 length of upper molar series, 26.4; length of mandible, 57.2; length of 

 lower molar series, 29.1. Ex type in United States National Museum. 



Genus Marmosa (2). 



Marmosa ruatanica Goldman. 



Marmosa ruatanica Goldm., Proc. Biol. Soc. Wash., XXIV, 1911, 



P. 237. 

 Type locality. Ruatan Island, off north coast of Honduras. 



1 This separates the water opossum of South America from that of Central 

 America, heretofore considered as one and the same species, and limits the range 

 of C. panamensis from Guatemala into Colombia. 



