19() On ^fammals from Jajny. 



Size about aa in M. murina. Fur soft and fine, of medium 

 length, liairs o£ back about 12 mm. long. Gctieral colour 

 above rather browner than Ridj^way'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 at)0ut a centimetre at its base furry and coloured 

 like the body ; the rest naked, grey for its proximal half 

 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 180 ; hind foot 24*5 ; 

 car 22-4. 



Skull : greatest length 38 ; condylo-basal length 37 ; zygo- 

 matic breadth 21'5 ; nasals, length 1G"5, middle breadth 2*7, 

 greatest breadth 5 ; breadth across postorbital processes 8'8 ; 

 ])alatal length 21 ; length of maxillary tooth-row 15"7 ; first 

 three molariform teeth 7*1. 



Ilab. as above. Yuto is about 70 kilometres north of 

 Villa Carolina. 



Tj/pe. Male, adult but not old. B.M. no. 20. 1. 7. 134. 

 Original number 714. Collected 23rd July, 1919. 



While of about tiie size of the members of the Marmosd 

 murina group, and with similarly unfurred tail-base, this 

 opossum has the greyish colour and yellowish belly of ^f. ci- 

 nerea and its allies, and is thus readily distinguishable from 

 any species as yet described. It is the first member of the 

 grou)) to be found in Argentine territory. 



Tiie 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. 



S. 554, 562, 5G3 ; ? . 549, 5G1. Jujuy. 1258 m. 

 J. 083, 693, 710. Villa Carolina. 500 m. 



