new Neotropical Muridas. 3G3 



and more rounded skull. Palatal foramina extending back 

 to tlie level of the anterior inner notch of ^ii. 



Ears short, hairy, similar in colour to the rest of the upper 

 surface. 



Hind feet short and broad, the six pads large, rounded, and 

 prominent ; fifth hind toe reaching, without claw, to the 

 middle of the short first phalanx of the fourth. In the type 

 the claws are so much worn down that their present length 

 does not show their unusual dimensions ; but in a second 

 specimen, somewhat younger, the middle anterior claw 

 measures 6*2 millim. in a straight line. 



Dimensions of the type (an aged female in skin) : — 



Head and body (c.) 118 millim. ; tail (c.) 47; hind foot 

 (moistened), without claw 22, with claw 24*5; heel to front 

 of last foot-pad 10. 



Skull : greatest length 30, basal length 25*8, basilar length 

 24*2, greatest breadth 16"3 ; nasals 12*5x4; interorbital 

 breadth 5 ; interparietal, length 1*4, breadth 4"2 ; length of 

 outer wall of infraorbital foramen 2*8 ; palate length from 

 henselion 13; diastema 7'8 ; palatal foramina 6*6 x 1*7; 

 length of upper molar series 5'1. Lower jaw : condyle to 

 incisor-tip 20; coronoid to angle 8'5 ; height of ramus below 

 £7i 4-3. 



Hab. East side of the Andes, near Fort San Rafael, 

 Province of Mendoza. Coll. T. Bridges. 



Type-. B.M. 60.1.5.14. 



Of this group of long-clawed Acodons two other species 

 have been described, both by Philippi, namely " Oxymycterus " 

 valdivianus * and 0. niger | ; but both are from the Chilian 

 side of the Andes, and both are said to be darker in colour 

 than A. megalonyx, while A. macronyx is conspicuously 

 lighter. 



Acodon mollis , sp. n. 



Hesperomys olivaceus, Thos. P. Z. S. 1882, p. 110, and 1884, p. 456 

 (nee Waterh.). 



Closely similar in almost every respect to A. olivaceus, 

 Waterh. Size and colour identical. Tail decidedly longer, 

 but coloured and clothed quite similarly. Fifth hind toe, 

 without claw, reaching to the middle of the first phalanx of 

 the fourth. Palate-ridges 3 — 4. 



Skull readily distinguishable by its much broader inter- 

 orbital space, which, being broader instead of narrower than 

 the muzzle, gives quite a different appearance to the general 



* Arch. f. Nat. 1858, i. p. 303. 



f Zeitschr. ges. Naturwiss. (9) vi. p. 445 (1872). 



