196 On Mammals from Jujuy. 
Size about as in WZ. murina. Fur soft and fine, of medium 
length, hairs of back about 12 mm. long. General colour 
above rather browner than Ridgway’s “ light greyish olive” ; 
sides lighter and more buffy ; under surface rich buffy, the 
median area of throat and belly “ light ochraceous buff,” this 
colour also extending up, though less intense, on the outer 
sides of the hips. ‘Top of muzzle dull buffy, cheeks rich 
buffy ; black orbital rings well marked. Upper surface. of 
hands and feet pale buffy; fifth hind digit about equal in 
length to the second ; third longer and fourth longest. Tail 
with only about a centimetre at its base furry and coloured 
like the body ; the rest naked, grey for its proximal halt 
above and third below ; the end white all round. 
Skull of normal proportions; nasals expanded behind ; 
supraorbital ledges well developed. Palatal imperfections of 
average extent. 
Teeth rather large in proportion to the size of the skull. 
P? small, p? and p* much larger, subequal. 
Dimensions of the type :— 
Head and body 139 mm.; tail 186; hind foot 24:5; 
ear 22°4. 
Skull: greatest length 38 ; condylo-basal length 37 ; zygo- 
matic breadth 21°5; nasals, length 16°5, middle breadth 2°7, 
greatest breadth 5; breadth across postorbital processes 8°8 ; 
palatal length 21; length of maxillary tooth-row 15:7; first 
three molariform teeth 7-1. 
Hab. as above. Yuto is about 70 kilometres north of 
Villa Carolina. 
Type. Male, adult but not old. B.M. no. 20.1. 7. 134. 
Original number 714. Collected 23rd July, 1919. 
While of about the size of the members of the Marmosa 
murina group, and with similarly unfurred tail-base, this 
opossum has the greyish colour and yellowish belly of JZ. ec- 
nerea and its allies, and is thus readily distinguishable from 
any species as yet described. It is the first member of the 
group to be found in Argentine territory. 
The species is named after Sr. Budin, in recognition of the 
keen and intelligent interest he takes in his collecting work. 
20. Marmosa elegans cinderella, Thos. 
3. 554, 562,563; 2. 549, 561. Jujuy. 1258 m. 
3. 683, 693, 710. Villa Carolina. 500 m. 
