584 Mr. O. Tliomas on the 



B. Sexes approximately equal in size. 



c. Size larg'er, both males and females with skull 



68-75 mm. in length. 

 «^. General coionr more brownish. Lower 



Parana from Santa Fe to Montevideo. ... '3. L. c. ijhvannlis. 

 h"^. General colour paler and more yellowish. 



Province of Buenos Ayres 4. X, c. hojiaria. 



d. Size smaller; (^ skull 60 mm., $ 58. South 



Uruguay and Rio Grande do Sul 6. L. c. lutrllla. 



1. Lutreolma crassicaudata tumeric GUiitli. 



Size comparatively small : skull-lengths, (^ 60 ram. ; 

 $ 52, the latter the smallest adult skull in the collection. 

 General colour dark brown. 



Only recorded locality. Better Hope, Demerara [Rev, 

 W. Y. Turner). 



Type, B.M. no. 79. 5. 1. 3. 



2. L. c. crassicaudata, Desm. 



Size larger: skull-lengths, J 70, Qb mm. ; $ 59, 57, 55. 

 Colour greyish olivaceous. 



Hab, Paraguay. Museum specimens from the Chaco 

 west of Asuncion {Insleij^ Marquis de Wavrin), 



3. L. c. paraiialisj subsp. n. 



Size large, the skulls of males of about the same lengtli as 

 in crassicaudata, and the females equalling the males, so as 

 markedly to exceed those of the Paraguayan forms ; skull- 

 lengths, cT 69, and others, broken, of about the same size ; 

 ? 70, 6H, 67, (^8, 61, 68 ; two of unknown sex 74, 72. 

 General colour comparatively dark brown, that of the type 

 approximating to *' buffy brown." Under surface also dark, 

 and the peculiar purplish tinge found in the living animal 

 more persistent in the skins than it is in other forms. 

 Dimensions of type (measured in the flesh) : — 

 Head and body 311 mm.; tail 282 ; hind foot 46 ; ear 26, 

 Skull : greatest length 69 ; combined length of ms^~^ 11. 

 Hah. Province of Santa Fe, extending apparently to the 

 delta of the Parana and eastward to Montevideo. Type 

 from Las Rosas, Santa Fe. Others from Noetinger, in the 

 same province. 



The range of this subspecies, both to north and south, 

 is as yet rather doubtful, for though the Museum possesses 

 specimens of the group from Corrientes and Goya to the 

 north, and Isla Ella, Parana Delta, and Colon, Montevideo, 

 which I provisionally refer to it, yet these are all more or 

 less immature, and so not diagnostic. But Lutreolina does 



