54 Contribution towards the knowledge of snakes in Brazil 
Biology — This snake is a very agile and quite aggressive 
aquaiic species. It is generally found under rocks on the margins 
of rivers. As already, mentioned, the 13 specimens are irom the 
interior of the Stats of São Paulo, all having been captured along 
the Tieté or its tributary rivers. In accordance with the ohserva- 
tions and dissections made, it feeds on small fishes and batrachians. 
It is oviparous and its young are born between December and 
January. 
I prepared the skull of n.º 272 showing the maxillary teeth 
which increase gradually in size posteriorly; mandibular teeth 18. 
palatins 14, pterygoids 16, all sub-equal, 
Notes — This is a species very approximate to Helicops an- 
gulata (L.) of which H. ScHLEGEL (1) cites specimens from Per- 
nambuco, Pará and from Brazil in general; G. A. BOULENGER (2) 
describes several specimens found in Perú and English Guiana 
and, also in Brazil, from Pernambuco, Pará and Upper Amazonas; 
and O. BOETTGER (3) names two which were found in Ilhéos 
in Baia, 
On April 15th. 1919, among 39 specimens of snakes pertaining 
to a collection sent from the State of Baia by Pror. PIRAJÃ DA 
SILVA, for classification, J. FLORÊNCIO GOMES found a H. an- 
gulata which was collected in that State. In 1918 (4) he found another 
specimen of the same species in a collection sent by MR. FRANCISCO 
Dias DA RocHa, Director of the Rocha Museum, Ceará. This 
specimen had: Sc. 19; V. 108; A. 2; Subc. 71 pairs. Finally during 
same year 1918, J. FLORÊNCIO GOMES published (>) a list of the 
snakes pertaining to the collection sent from the Pará Museum, 
by DRA. E. SNETHLAGE, among which there was also found a 
specimen of the same species which had been collected in the 
Curuá river, Pará, and which had: Se. 19; V. 120; A. 2; Sube, 
16 pairs; Upper lab. 8 (4h). 
ln the Butantan Institute collection there are 4 specimens 
of H. angulata, of which n.ºs 777 (young) and 1,701 were found 
in Santa Filomena, State of Piauí, where they were collected by 
an agronomist MR. FRANCISCO IGLÉSIAS; and n.ºs 1.760 amd 1.761 
coming from the State of Baia, where they were obtained by 
Dr. Eurico DE SALES GOMES. 
In the «Museu Paulista» collection I found 3 specimens of 
this species two of which, n.º 1.393 and 1.395, have no specified 
origin and one, n.º 1.396, was found on November 1917 in S. Luis 
de Cáceres, State of Mato-Grosso by MR. ERNESTO GARBE, travelling 
naturalist for that Musgum. 
(1) H. SomceceL — “Éssai sur la Physionomie des Serpents”, 1837, v. II, p. 351. 
(2) G. A. BovuLenger — “Catl. of Snakes in the Brit. Mus ”, 1893, v. 1, p. 279. 
(*) O. Boerroer — “Katalog der Reptilien-Sammlung in Museum der Senckenbergischen natur- 
forschenden Gesellschaft”, 1898, II Teil. (Schlangen); p. 30. 
(4) J. FLorencio Gomes — “Contribuição para o conhecimento dos ofídios do Brasil” — II — 
Ofídios às Museu Rocha (Ceará) in Revista do Museu Paulista, 1918; t. X; p. 507. 
(5) J. Frorkncio Gomes — “Contribuição para o conhecimento dos ofídios do Brasil — III — 
Ofídios do Museu Paraense” — in Memórias do Instituto de Butantan, 1918, t. T, fase. I, p. 60. 
