158 MAMMALIA. 



The only species known is also from Brazil, somewhat sur- 

 passes the Guinea-Pig in size, and is of an olive-grey. 



Chloromys, Fr. Cuv. Dasyprocta, Illig. 



The Agoutis have four toes before and three behind ; four grinders 

 throughout, almost equal, with flat crowns irregularly furrowed, 

 rounded borders notched on the internal edge in the upper jaw, and 

 on the external one in the lower. In disposition, and in the nature 

 of their flesh, they resemble Hares and Rabbits, which they may be 

 said to replace in the Antilles and hot parts of America. 



C. acuti ; Cavia acuti, L.j Buff. VIII, 1, l, (The Common 



Agouti.) The tail reduced to a simple tubercle ; fur brown. 



The male fawn coloured on the croup ; as large as a Hare. - 

 C. acuchi; Cavia acicchi, Gm.^ Buff. Supp. Ill, xxxvi. (The 



Acouchi.) Six or seven vertebrse in the tail ; brown above, 



fawn coloured beneath ; size of a Hare. 



C. patagonicus ^ Cavia patagonica, Penn. and Schreb. ; the 



Pampas Hare of the Creoles of Buenos Ayres. This animal 



appears to be a species of Agouti, with longer ears, and a 



very short naked tail ; but its molars are not known. 



CCELOGENYS, Fr. Cuv.(l) 



The Pacas, in addition to teeth very like those of the Agoutis, have 

 a very small toe on the internal edge of the fore foot, and one on each 

 side, equally small on their hinder one, making five toes every where. 

 Besides this, there is a cavity formed in their cheek which dips un- 

 der the border formed by a very large and projecting zygomatic 

 arch,(2) which gives a very extraordinary aspect to the bony head. 

 Their flesh is said to be very good. 



There is one species or variety fawn coloured, and another 



brown, both of which are spotted with white, the Cavia paca, 



L. ; Buff. X, xliii ; Supp. Ill, xxxv. 

 Finally, there remains an animal perhaps nearly allied to the 

 Cavias, and possibly more so to the Lagomys or the Rats, which 

 we are unable to dispose of, on account of our ignorance of its teeth : 

 I mean the Chinchilla, thousands of whose skins are to be had, but 

 of which we have never yet been able to procure the entire body. It 



(1) Anoema, without sti-ength ; Chloromys, 3'ellow rat; Basyproda, hairy but- 

 tock ; Ccclogenys, hollow cheek ; Ilydrochosrus, water-pig. 



(2) Dr Harlan (Faun. Americ, p. 126) has made a new genus from a head pre- 

 served in the Philadelphia Museum, which he names Osteopera ; but from the de- 

 scription, it appears to us to be nothing more than that of the Paca. Desmarets 

 has already made the same observation. 



