On the " Huron " of the Argentine. 213 



at Lagoa Santa) by Dr. M. Clau.ssen, and may be treated 

 as a genuine wild-killed example of (J.furax. 13eing a fully 

 adult male, it is of especial value for comparison with the 

 Argentine examples available. This skull is 77 mm. in 

 median length, a size which is exactly the same as that given 

 by Winge tor a Lagoa Santa skull in Copenhagen. 



In comparison with this, it is evident that the materially 

 larger animal from the Argentine should be distinguished. 

 It may be called 



Grisonella hurona.v, sp. n. 



Size largest of genus. Colours as usual, the facial band 

 in the type well marked, creamy-buff; light tipping of the 

 dorsal hairs well developed. But there is great variation in 

 both facial band and dorsal tipping, some examples being 

 quite dark and with a nearly obsolete frontal band. 



Skull stout and heavy, with well-developed crests and 

 ridges. Teeth stout, molar comparatively large. 



Dimensions of the type, male, and of an adult female from 

 the same locality : — Head and body 600 mm., 510 ; tail 

 (imperfect), 135; hind foot 70, 61. 



Skull : median length 83, 73'5 ; condylo-basal length 84, 

 74 ; zygomatic breadth, 48, 42 ; interorbital breadth 20, 17*5; 

 mastoid breadth 43'5, 37*5; maxillary tooth-row 24*8, 21 ; 

 length of ;/ 9*2, 7'4 ; transverse diameter of m^ 7*1, 6. 



[Jah. Central and Eastern Argentina. Type from Mar del 

 Plata, S.E. Buenos Ayres. Other specimens from various 

 localities northwards to San Cristobal, Province of Santa Fd. 



Type. Adult male. B.M. no. 12. 2. 17. 6. Original 

 number 3. Collected 4th June, 1911, and presented by 

 W. A. Smithers, Esq. 



The larger Chilian huron, which in 1912 I described as 

 Grison furax melinus^ I should now consider as a distinct 

 species, and its name shouhl be Grisonella melina. In the 

 comparison with the nuiterial then existing, too much stress 

 was laid on the pallor of the facial lim*, which additional 

 specimens show to be more strongly buff than in G. huronax, 

 even if paler than in true G. furax. G. melina is a rather 

 smaller animal than G. huronax, and is confined to the 

 western side of the Andes. 



