8 U.S. NATIONAL MUSEUM BULLETIN 2 46 



[Stenodelphis] Blainvillei, Trouessart, 1898, Cat. Mamm., p. 1016 [classi- 

 fication; tenuirostris Malm, 1870, a synonym]. 



Stenodelphis blainvillei, Slijper, 1930, Bull. Mus. Roy. Hist. Belgique, 

 14(10): 13 [skeleton in museum collection]. — Cabrera and Yepes, 

 1940, Mamiferos Sudamericanos, p. 293, pi. 72 (animal) [characters; 

 habits; distribution]. — Kellogg, 1928, Quart. Rev. Biol., 3: 71, fig. 

 11 (skull) [characters; relationships]. — Fraser and Purves, 1960, Bull. 

 Brit. Mus. (Nat. Hist.), Zool., 7: 91, 107, fig. Mb (pterygoid sinus), 

 pis. 19-20 (skull).— Carvalho, 1961, Rev. Brasil. Biol., 21(4): 443, 

 fig. 2 (animal), figs. 3-5 (skull), figs. 6-11 (skeleton) [S. Atlantic: 

 Brazil (Santos, Sao Paulo); external characters; osteology; measure- 

 ments; comparisons; stomach contents: clupeids, crustaceans]. 



Stenodelphis blainvillii [sic], Kellogg, 1940, Nat. Geogr. Mag., 77(1): 81, 

 pi. 15 (animal) [characters; habits; distribution]. 



Pontoporia tenuirostris Malm, 1871, Kongl. Svenska Vetensk. Akad. 

 Handl., 9(2): 46, pi. 2, fig. 10a (animal), \0b-c (skull), pi. 4, fig. 34 

 (forelimb bones) [S. Atlantic: Uruguay (type locality: Montevideo); 

 type a mounted skin ; skull in Goteborg Naturhistoriska Museum] . 



Type: Skull only, Museum National d'Histoire Naturelle, Paris; collected 

 by M. de Freminville. 



Type locality: Mouth of Rio de La Plata, near Montevideo, Uruguay. 



Distribution: Atlantic coast of South America from Rio Grande do 

 Sul, Brazil (Lagoa dos Patos), to Peninsula Valdes, northern Chubut, 

 Argentina. 



Genus INIA d'Orbigny 



Inia d'Orbigny, 1834, Ann. Mus. Hist. Nat., Paris, 3: 31. — Gervais, 

 1855, Castelnau Exped. Amerique du Sud, pt. 7, Zool., Mamm., p. 

 90 [characters; taxonomy]. — Flower, 1869, Trans. Zool. Soc. London, 

 6: 98 [review]. — Van Beneden and Gervais, 1880, Osteographie des 

 cetaces, p. 468 [taxonomic review]. — Beddard, 1900, Book of whales, 

 pp. 293, 296 [characters].— Kellogg, 1928, Quart. Rev. Biol., 3: 54 

 et seq. [characters; history; relationships]. — Winge, 1942, Interrelat. 

 Mamm. Gen., 3: 245, 247, 273, 297 [characters; classification].— 

 Fraser and Purves, 1960, Bull. Brit. Mus. (Nat. Hist.), Zool., 7: 45 et 

 seq., fig. 26 (table) [classification; auditory system]. 



Type species: Inia Boliviensis d'Orbigny (=Inia geoffrensis Blainville), by 

 monotypy. 



Distribution: Tropical zones of the Amazonian drainage system in 

 Brazil, Bolivia, northern Peru, Ecuador, Colombia, Venezuela (upper 

 Rio Negro) and the connecting Casiquiare Canal, and upper Rio Orinoco 

 system westward into the upper Rio Guaviare system in Colombia. Inia 

 occurs above the cataracts of the upper Guaviare in Meta, Colombia, and 



