472 Dr. P. L. Sclater on Ateles Bartlettii. 
I may add that the typical specimen of Testudo chilensis, 
i British M 
by Wagner in 1840, in the supplementary notes to his first 
volume of Schreber’s ‘ Saugethiere’ (p. 313). Further details 
are given in one of Wagner’s articles on South-American 
Mammals, in the ‘ Abhandlungen’ of the Academy of Munich 
(v. p. 420); and the species is inserted in its proper place in 
the fifth or * Supplement-Band " to Wagner’s ‘ Siiugethiere,’ 
the most ordinary book of reference on this Order of Mam- 
mals (/. c. p. 78). 
err v. Pelzeln, of the Imperial Cabinet of Vienna, who 
has most kindly examined the typical specimens of this spider 
monkey for me, and agrees in considering them the same as 
Ateles Bartletti, Gray, so far as he can tell from the figure 
and very short description * above referred to, informs me that 
Natterer obtained five examples of this animal—a male, three 
emales, and a young. But as the females agree with the 
male in the yellow colour of the under surface, it follows that 
the spider monkey just described by Dr. Gray as resembling 
his A. Bartlettii, except in being “ greyish white” where the 
A. Bartlettit is bright yellow,” cannot be the female of this 
species. Nor can it, I think, be the young of this spider 
monkey, as Herr v. Pelzeln informs me that the young indi- 
vidual of A. variegatus, in the Imperial Cabinet of Vienna, 
resembles the adult, except in the absence of the frontal spot 
and the white stripe on the sides of the face. At the same time 
the condition of the skeleton of the Society’s specimen shows 
it to have been quite immature ; and the length of the fur and 
other characters of this example agree so well with those of 
. * Herr v. Pelzeln observes that the under colour is rather too bright 
in the figure and that no dimensions are given. In two of Natterer's 
"gni, also, the yellow colour of the under body is continued over 
the upper surface of the limbs, 
