Mammals from Salta, N. Argentina. 215 
2. Nyctinomus brasiliensis, Geoff. 
a-c. Cafayati, Salta. 
It seems probable that this common bat is Azara’s “ Petite 
Chauve-souris obscure ”’ (Chauve-souris neuviéme), to which, 
fortunately, Geoffroy did not give a special name, referring it 
(wrongly) to his own Mo/ossus obscurus. ‘That Azara’s bat 
was a Nyctinomus is clear from his statement that ‘‘ La lévre 
supérieure a des plis verticaux.”’ 
3. Phyllotis griseoflavus, Waterh. 
a. Upper Cachi, Salta. 
6. Lower Cachi. 
This handsome rat was first recorded from the north 
(Jujuy) by Matschie, who was, however, naturally doubtful 
of its identity with a species described from such a distant 
locality as Rio Negro, Patagonia, the type locality of 
Waterhouse’s animals. After the most careful comparison of 
these Salta examples withthe type, and with a skin from 
Catamarca in the Museum collection, I am still of the opinion 
I expressed when Dr. Matschie’s specimen was sent to 
London for examination, that the northern and southern 
forms cannot be separated. 
Moreover, the examination of several recent collections 
shows that there is a most remarkable affinity between the 
faunas of the extreme north-west part of Argentina, including 
the neighbouring parts of Bolivia, even up to considerable 
altitudes, and that of North-eastern Patagonia, so far at least 
as Bahia Blanca and the Rio Negro are concerned. ‘Thus I 
have lately seen a small collection from Bahia Blanca, and 
among them is a cavy which I cannot distinguish from 
Cavia boliviensis, Waterh., first described from the high land 
between Cochabamba and La Paz, Bolivia, while there is 
in the same collection an example of Oryzomys laucha, Desm., 
whose typical locality is Paraguay, but specimens of which 
were obtained by Dr. Borelli at Tala, Salta, and other 
localities in the present region. ‘lhe Museum possesses both 
the cavy and the Phyllotis from Catamarca, and the Laucha 
has been taken all down the Parana to its mouth, where, at 
La Plata, I have found it abundant. 
It would seem therefore that many of the Pampas animals 
extend north and south for a very great distance without 
any appreciable modification, ascending in the north to 
latitudes at which they no doubt find a very similar 
climate to that of the lowlands in the southern parts of their 
range. For this reason, when working out specimens coming 
from Bolivia, Argentina, or Patagonia, it must not be too 
15* 
