On Brazilian Reptiles and Batrachians. 423 



larger in proportion to the size of the animal than those of 

 any of the allied species. 



The following are the dimensions of the typical specimen, 

 a female, preserved in spirit : — 



Head and body 147 millim., tail 195, hind foot 31, forearm 

 and hand 39" 5, ear (above crown) 14. 



Skull: basal length 31*5 millim., greatest breadth 20*0; 

 nasals, length 14-0; interorbital constriction, breadth 4*2 ; 

 interparietal, length 4*8, breadth 11*0; palate, length 17'6 ; 

 palatal foramen lo j length of molar series 7*0 j basi-cranial 

 axis 12*0. 



As to the other species incidentally mentioned under H. 

 pyrrJiorhinus in my former paper, 1 am indebted to Dr. 

 Herluf Winge, of Copenhagen, for such a description of the 

 true H. mastacalisj Lund *, as shows that II. pyrrhonotus is 

 wholly distinct from that animal ; while a personal examination 

 of the type of H. macrurus^ Gerv. f, in the Paris Museum, 

 proves that, like H. mastacalis, it is a true Rkipidomys, and 

 differs therefore very essentially from the Peruvian species 

 here described. 



XLI. — A Synopsis of the Reptiles and Batrachians of the 

 Province Rio Grande do Sid^ Brazil. By G. A. 

 BOULENGER. 



The present list includes all tlie species of Reptiles and 

 Batrachians hitherto obtained in the Province Rio Grande do 

 Sul. The total numbers (63 for the former and 28 for the 

 latter class, against 31 and 22 as given by Hensel, the first 

 explorer of that district) show an increase almost entirely d ue 

 to Dr. von Ihering's activity. In view of rendering this list 

 more useful, I have intercalated keys to the genera and 

 species, based on the most constant and easily ascertainable 

 characters, as taken from specimens obtained in the Provmce, 

 and every species is accompanied by an enumeration of the 

 principal synonyms. The latter part of the work will be 

 found to contain much original matter, especially as I have 

 had access to the entire Henselian collection in the Berlin 

 Museum. 



The indication " B. M. ; v. I. " signifies that specimens 

 have been sent to the Natural-History Museum by Dr. von 

 Ihering. 



* Blik Bras. Dyr., Dansk. Afliandl. viii. p. 279 (1841). 

 t CasteLa. Exp. Amdr. du Sud, Mamm. p. 3 (1855). 



29* 



