268 Bulletin American Museum of Natural History. [Vol. XVI, 



Didelphys azara WATERHOUSE, Nat. Hist. Mamm. I, 1846, 470 (except 

 ref. to D. aurita Wied). Brazil, Paraguay, Bolivia, etc. BUR- 

 MEISTER, Erlaut. Faun. Bras. 1856, 61, pi. i, animal. WAGNER, 

 Schreber's Saug. Suppl. Ill, 1843, 3 8 (part); ibid. V, 1855, 223 

 (part). HENSEL, Phys. Abhandl. Akad. Wiss. Berlin, 1872 

 (1873), III, pi. i, figs, i and 4. Rio Grande do Sul. THOMAS, 

 Ann. Mus. Civ. Stor. Nat. Genova, XX, 1900, (p. 4 of sepa- 

 rates). Province of Parana, Brazil. 



Didelphys marsupialis azaroz COPE, Am. Nat. Feb. 1889, 129, 149. 

 Sao Joao do Monte Negro, Rio Grande do Sul, and Chapada, 

 Matto Grosso, Brazil. 



Didelphis albiventris LUND, Kongl. Dansk. Vidensk. Selsk. Afhandl. 

 VIII, 1841, 236. Lagoa Santa, Brazil. BURMEISTER, Erlaut. 

 Faun. Bras. 1856, pi. ii, animal; pi. v, figs 4 and 5, and pi. vi, 

 fig. 4, skull. 



Didelphys pcecilotis WAGNER (ex Natterer, MS.) Arch. f. Naturg. 

 1842, i, 258, Cuyaba, Matto Grosso, Brazil; Abhandl. Akad. Wiss. 

 Munchen, V, 1847 ( l8 S). I26 ; Schreber's Saug. Suppl. V, 1855, 

 219 (identified with D. albiventris Lund, of earlier date). 

 PELZELN, Verh. z.-b. Gesell. Wien, XXXIII, Anh. 1883, 109. 

 Didelphis leucotis WAGNER, Abhandl. Akad. Wiss. Munchen, V, 1847 

 (1850), 127 (in text); Schreber's Saug. Suppl. V, 1855, 223 

 (Azara's Micoure" premier renamed) . 

 Didelphis poscilonota SCHINZ, Syn. Mamm. I, 1844, 504. Rio Grande 



do Sul, Brazil. 



Didelphys lechii IHERING, Mamm. do Rio Grande do Sul, 1892, 95 

 (p. 5 of separates) Dark phase, from south of the Rio Grande 

 do Sul. 



Didelphys marsupialis var. albiventris WINGE, Jordf. og nulev. Pung- 

 dyr (Marsupialia) fra Lagoa Santa, etc., E. Mus. Lundii, II, 7, 

 pi. iii, fig. 3; pi. iv, fig. 9. Lagoa Santa. 

 Type locality, Asuncion, Paraguay. 



Geographical Distribution. Uruguay, northern Argentina, eastern 

 Bolivia, and northward to central Matto Grosso, and Minas Geraes, 

 Brazil. 



Adult. Above varied black and white, through the presence of a 

 more or less abundant coat of long overhair, which is wholly clear 

 "white to the base in fresh pelage, soiled dingy white in old pelage; 

 underfur clear white or yellowish white, the apical third deep black, 

 the black-tipped portion very long and much coarser than the basal 

 white portion, the pelage of the ventral surface having the character 

 of woolly underfur tipped with black hairs, especially over the median 

 -area. The amount of white overhair above varies from being abun- 

 dant, and forming a conspicuous feature of the pelage, to a scanty 

 sprinkling or, in the black phase, its entire absence. Below the 

 general color varies from nearly pure white to deep buff, with or 



