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)
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