An. das Mem. do Instituto de Butantan — Vol, 1 - fasc. 1 (Ofiologia) 55 
In accordance with this data I deduct that Helicops angu- 
lata: (L.) oceurs in Brazil, principally in regions crossed by the 
tributary rivers of the Amazonas, Parnaiba, São Francisco and 
Paraguai. 
As to the characteristics of this species (H. angulata) BOULEN- 
GER (6) names the following, among other: Frontal once and a half 
to once and two thirds as long as broad; temporals 1 or 2-2 cr 3, 
posterior keeled; 5 or 6 lower labials im contact with the an- 
terior chin-shields. Ventrals, 102-130. Subcaudals, 61-94 Olive or 
gvey-brown above, with more or less regular dark brown, black 
edged cross bands, which narrow towards the sides, where they 
are usually confluent with the black cross-bands of the belly; 
a large rhomboidal black blotch on the nape; lower parts yellowish 
(im spirit) with large black spots, or, more frequently, with re- 
gular black cross bands. 
G. Jan (7?) describes among other characteristics the follow- 
ing: 5 temporals (2-3), one alone in contact with the pos- 
toculars; 10 lower labials, first 6 in contact with the chin-shields. 
L. E. Grirrin (8) found the following in a specimen which 
came from South America and which exist in the collection of 
the Carnegie Museum; Ventrals 117, Subcaudals 74 pairs; Upper 
labials 9 and 8 (4th.); temporals 2-4. 
Besides the foregoing descriptions, I made a minute exami- 
nation of the 7 above mentioned specimens ot H. angulata pertaining 
to the Butantan and Paulista Museum coliections, and another 
(young) 'under n.º 21, which came from Bolivia and pertains te 
a collection of snakes sent by Dr. Pepro SERIE of the Buenos- 
Aires Nacional Museum for classification and verified the following 
characteristics: 
a) Frontal smooth, about once and three quarters as long 
as broad, terminating posteriorly in an open angle (nearly straight), 
only about twice as long as the diameter of the eye and, in 
all the specimens, widening posteriorly just in front of the extr emity, 
excepting specimen m.º 1.761 in which it is of uniform width. 
b) All 8.have 2 +3 temporals. N.º 777, however, has the 
two anterior temporals fused on the left; n.º 1.701 has two 
temporals, middle and upper, of the posterior row, separated by 
two small supplementary scales; n.º 242 and 21, according to 
JAN, have only one superior temporal of the Íst. row contiguous 
to the postoculars. All have the posterior temporals as well as 
the occipitals keeled, 
o) Tm n.º 1.393, 1.995,. 1.996, 21 and 1.701 and only on 
the right on n.ºs 1.760 and 1.761, there are 5 lower labials in 
contact with the anterior chin-shields. On the left of n.º 1.761 
+ -—— — 
(8) G. A. BouLENGER — Op. cit., p. 279. 
(7) G. Jax. — “Prodromo della Iconographia Generale degh Ofidi * VIII Grupo: Potamophi- 
lidae”, Modena, 1864, p. 5". 
(8) L. E. Grirriy — “A Catalog of the Ophidia from South America at present (June, 1916) 
contained in the Carnegie Museum with descriptions of some new species” in Memoirs of the Carnegie 
Museum; 1916; vol. VIII; n. 3; p. 179 
