Vol. 30, pp. 107-116 May 23, 1917 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 





NEW MAMMALS FROM NORTH AND MIDDLE AMERICA. 



BY E. A. GOLDMAN. 



General comparison of museum material in connection with 

 work in progress has revealed the existence of ten hitherto un- 

 recognized subspecies of mammals representing various orders, 

 families and genera. For the privilege of studying collections 

 in their charge, and other courtesies I am much indebted to 

 Dr. J. A. Allen and Mr. H. E. Anthony of the American Mu- 

 seum of Natural History, New York, and to Mr. Samuel Hen- 

 shaw, Mr. Outram Bangs, Dr. Glover M. Allen, and Dr. Thomas 

 Barbour of the Museum of Comparative Zoology, Cambridge, 

 Massachusetts. 



The new forms are described as follows : 



Didelphis marsupialis particeps, subsp. nov. 

 SAN MIGUEL ISLAND OPOSSUM. 



Type from San Miguel Island, Panama. No. 8439, d 1 adult, Museum of 

 Comparative Zoology (Bangs collection), collected by W. W. Brown, Jr., 

 May 8, 1900. Original number 165. 



General characters. — Similar in general to Didelphis marsupialis etensis 

 as represented on adjacent mainland, and Didelphis marsupialis colombica 

 of South America, but face less blackish and skull differing from both in 

 structural details, especially the narrow braincase and posteriorly spread- 

 ing zygomata. 



Color. — Type: Muzzle yellowish; cheeks, middle of face and areas over 

 eyes grayish brown ; over fur on top and sides of head and over dorsum 

 black, the under color pale yellowish; under side of neck and abdomen 

 yellowish or buffy, tinged with black ; orbital rings, ears, limbs, inguinal 

 region and basal third of tail black ; terminal two-thirds of tail (epider- 

 mis) yellowish. 



Skull. — Rather small, short and broad in general dimensions with 

 broad rostrum, narrow braincase and posteriorly expanded zygomata. 



26— Proc. Biol. Soc. Wash., Vol. 30, 1917. (107) 



