REPTILES. 
47 
thigh ; a smaller one at the corner of the mouth ; the posterior surface of the 
hinder legs and the flanks marked with black spots. Iris gold coloured ; tym- 
panum brown.” 
DIMENSIONS. 
Length of the head and body 
of the anterior extremities 
of the posterior extremities .... 
In. Lin. 
1 8 
1 0 
2 8 
The young of this species, instead of the bright green colour of the 
upper parts, is of a delicate grey with small brown markings ; and a lateral 
fascia of brown, bordered above and beneath with a white line, extends from the 
fore part of the head backwards, the upper white line nearly to the thigh, the 
inferior one to the shoulder. The black spots on the flanks and thighs are but 
just visible. 
This species so nearly resembles the Hyla pulchella of Mons. Bibron, at 
least as far as his description enables me to ascertain its characters, that it was 
with some hesitation that I came to the conclusion that they are distinct. 
Exclusive, however, of the difference of colour, the back of the present species 
is granulated, and the throat still more distinctly so, whereas the other animal 
has the skin on the upper parts, as well as on the anterior part of the throat, 
quite smooth. The palatine teeth also appear to be somewhat differently 
arranged. 
Mr. Darwin observes, that this species was found in numbers in the open 
grass plains, and likewise in swamps, about Maldonado, and that they can 
never ascend trees, as these are entirely wanting at the places frequented by 
the Hylge. 
Fam.— BUFONID^. 
Genus — RHI NODERMA. Bihr. 
Lingua cordato-ovata, postice lihef'a et subemarginata. Dentes palatini rmlli. Tym- 
panum celatum. Glandee parotidese nullce. Digiti breves, depressi; anteriores 
ad basin tantum, posteriores fere dimidio palmati. Rostrum cutis appendiculo 
filiformi instructum. 
