On new Species of Reithrodon de. from Argentina. 473 
- LXIV.—New Species of Reithrodon, Abrocoma, and Scapte- 
romys from Argentina. By OLDFIELD ‘l'HOMAS. 
(Published by permission of the Trustees of the British Museum.) 
A. A FURTHER COLLECTION FROM Sr. BuDIN. 
After making the collection in Jujuy, of which an account 
was given in February *, Sr. Budin went back to Catamarca,. 
and paid further visits to Clumbicha and Otro Cerro, localities 
at which he had obtained so many interesting novelties in 
1918. Lists of specimens from both places have already 
been published fT, and I now only propose to describe two 
more novelties from Otro Cerro, additional to the previous 
list, together with a couple of other new forms of Reithrodon. 
Attention should be again called to the fact that Otro Cerro 
is not in Rioja, as erroneously stated in the title to my earlier 
paper, but is in Catamarea, about 18 km. N.N.W. of 
Chumbicha. 
The discovery of a second Argentine species of Abrocoma, 
quite different from that of Jujuy, is the most noteworthy 
result of the fresh collection. 
Reithrodon caurinus, sp. n. 
A buffy rabbit-rat with whitish belly and nearly white 
tail. 
General colour more strongly buffy than usual. Back 
clay-coloured heavily lined with the black ends to the longer 
hairs. Sides, or at least a band bordering the under colour, 
buffy, often ochraceous buff, the rump also more or less of 
this colour. Under surface whitish, not sharply defined 
laterally, but almost entirely without the buffy or cinnamon 
found in all the other species, the sternal region only being 
dull buffy ; hairs broadly slaty at base except in the inguinal 
region, where they are wholly white. Head and ears with 
the piebald markings characteristic of the genus particularly 
well developed. A strongly marked buffy supraorbital line, 
and distinct patches at the bases of the ears. Proectote 
blackish ; metentote buffy. Hands and feet white ; soles 
more naked than in the southern species, the hairs ceasing 
entirely behind the posterior pads. ‘Vail white, the darker 
colour of its upper side reduced to a narrow inconspicuous 
line. 
. p. 188 (1920), 
* Ann. & Mag. Nat. Hist. (9) v 
489 (1919). 
t Op. cit. (9) ili. pp. 115 & 
