A Preliminary Study of the South Ameri- 

 can Opossums of the Genus Didelphis. 



By J. A. ALLEN. 



AUTHOR'S EDITION, extracted from BULLETIN 



OF THE 



plxtscum of Uatttra 



VOL. XVI, ARTICLE XX, pp. 249-279. 

 New York, Aug. 18, 1902. 



