LAGOMYS 109 



Cavia porcellus. 



Mus porcellus, LinnceusSyst. Nat., 12th ed., i, p. 79 (1766). 

 Cavia cobaya, Gmelin Syst. Nat., i, p. 122 (1788) ; Blyth Cat. no. 426, p. 

 129; IV'aterhouse Nat, Hist. Mamni , ii, p. i85. 



The Guinea Pig. 



Distribution. — South America, only known domesticated. 



a. Skin $ Purchased. 



b. Skin, skull $ Purchnsed. 



c. Skin $ Zoological Gardens. 



rf. Stuffed A. D. Bartlett (1849), A.S.B. 



e. Skeleton $ W. Rutledge. 



Cavia australis. 



Cavia australis, Is. Geoff. St. Hil. Mag. de Zool., iii, pi. 129* ; Blyih Cat. no. 



425, p. 129. 

 Kerodon kingii, Bennett P. Z. 5., p. 190 (1835). 



Distribution. — Patagonia. 



c. Stuffed C. T. Eyton, A.S.B. 



Genus HYDROCHCERUS. 



Hydrochoerus, Erxleben Syst. Regn. Anim,, p. 191 (1777). 



Hydrochoerus capybara. 



Hydrochoerus CcupyhsirdL Erxleben Syst, Regn. Anim, p. 193 (ijyy). 



Distribution. — South America from Guiana to Paraguay. 



a. Skeleton mtd. W. Rutledge. 



b. Skull E. Blyth, A.S.B. 



Genus LAGOMYS. 



Lagomys, Cuvier Regne Anim., 2nd ed., i, p. 218 (1829). 



Key of the Ifidian Species. 

 a. Larger forms generally over 7 inches in length. 



b. Fur sandy rufous ; skull very narrow between the orbits. 



c. Ear long about i inch ; no white nuchal patch ; skull with 

 the anterior palatine foramen divided into an anterior and 

 posterior portion by the inwardly projecting palatal 

 platesiofthe premaxillae. L. ladacensis, p. no. 



c^. Ear shorter, only about 75 inch; a large conspicuous white 



