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*
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