Sete AE Mr. O. Thomas on Agoutis. 
XXXV.—WNotes on Agoutis, with Descriptions of new Forms. 
By OLpFIELD THOMAS. 
(Published by permission of the Trustees of the British Museum.) 
In his list of duplicates for sale* Lichtenstein described, in 
1823, an agouti as follows :—“ Dasyprocta Azare n. Acouti 
Azar. Differt a Cav. Aguti Auct. potissimum tergo concolore, 
pllis bast albis vestito.. HE provincia San. Paulo Brasil. .... 
E, (i. e. spectmen eximium) Thir. 7.” 
He here describes a specimen with a definite locality-—S4o 
Paulo,—and it is clear that the name must be applied to the 
species of that locality, with his specimen as type, whether 
the “ Acouti” of Azara is or is not of the same species. 
In 1841, however, Lund fT, finding that the Lagoa Santa 
agouti was larger than the Paraguayan, with a longer tail, 
described the former as new under the name of D. caudata, 
and applied the name D. azare to the latter. 
This allocation of names has been followed by Waterhouse 
and other authors to the present time, though the distinction 
of the two forms has not been generally recognized. 
Now, however, I find that the two species are undoubtedly 
distinct, and since the name JD. azare must certainly be 
applied to the Sio Paulo animal, with D. caudata as a 
synonym, the Paraguayan one is left without a name. 
It may be called 
Dasyprocta felicia, sp. n. 
Size decidedly less than in D. azare.. Colour on the whole 
as in that animal, but the yellow of the fore-back and flanks 
is paler and greyer, so that there is less contrast between 
these parts and the greyish rump. Under surface with a 
distinct mesial line of yellow or white running from chest to 
inguinal region. Tail shorter than in azarae, little more than 
4 inch in length. 
Skull conspicuously smaller than that of D. azare. 
Dimensions of the type (measured on skin) :— 
Head and body 490 mm.; tail 15; hind foot 100; 
ear 84. 
Skull: greatest length 102 ; condylo-incisive length 86:4 ; 
* Verz. Doubl. p. 3 (1828). 
+ K. Dansk. Vid. Selsk. viii. p, 287 (1841). 
