CANIS AZAK.E. 71 



We do not perceive that it differs from C. azara by any important 

 character, though the fourth upper premolar is somewhat smaller com- 

 pared with the length of the two upper molars. Bearing in mind the 

 variability we have found to exist in other species, we cannot bring 

 ourselves to regard this as more than a dark local variety of C. azara. 



Similarly we regard Burmeister's C.griseus and C. gracilis as but pale 

 varieties of the same species, the skulls and teeth of these forms being 

 in such full agreement with those of C. azara. Burmeister himself 

 admits that there is much resemblance between these asserted species, 

 his C. gracilis being intermediate between his C. griseus and his 

 C. azarce. It may be that these are distinct species, but as yet we have 

 no material evidence which, we think, entitles us to assert them so to 

 be *. The name C. griseus, which was given by Gray to a skin in the 

 British Museum, cannot be seriously regarded, as it was applied to an 

 immature animal. 



Dr. Burmeister found between the rivers Parana and Uruguay 

 specimens of a form for which he proposed the name C. entrerianus 

 specimens of different sexes, ages, and seasons. He describes his 

 species as being of " a reddish yellow-brown, with hairs on the back 

 which were black, tipped with white annulations. Face and limbs red- 

 brown, like the back. Front of the neck, breast, and inner side of the 

 limbs whitish or pale yellowish red ; end of the tail black." 



The young (which he found sucking in January) were of a yellowish 

 brown, except the face, limbs, and tail-end, 'which were blackish brown. 



A female (which was in milk on the 27th of October) was reddish 

 brown, with white and black bristly hairs interspersed. An old male 

 was of a much lighter yellow colour. 



These differences of hue show how little distinctions of the kind can 



* He says of C. gracilis : " Le renard de cette espece ressemble beaucoup a la pre- 

 cedente, mais il est plus petit, plus elegant de forme." Of C. griseus he tells us : 

 " C'est un renard extremement elegant et sans doute la plus jolie espece du groupe, se 

 distinguant des autres par le pelage assez long, fort epais, plus doux, d'apparence 

 presque soyeuse et de couleur plus harmonique, avec une teinte generale tirant plus sur 

 le roux que chez les autres." Description physique de la llepublique Argentine; 

 vol. iii.(1879), pp. 150 & 151. 



