Neotropical Mammals. 163 



but it seems to be witliout a name properly applicable to it. 

 The Vivf.rra vittata of Schreber was based on a Surinam 

 animal, probably one of the group with a supplementary cusp 

 on the lower carnassial, and certainly not the present form, to 

 which its name has been so commonly applied. Thuuberg's 

 Ursus hrasiliensis is, again, clearly the larger type of tliis 

 group, and would appear to be the same as Nehring's 

 (jdlictis crassidens. 



The Ciiilian G. cuj'a, Mol. (syn. G. qm'qui, Mol.), agrees 

 with 6^. /wraA" in the essential characters of size and tooth- 

 structure, but in colour is much greyer, the butfy parts of 

 G.Jurax being replaced by white or whitish. 



Grisonfurax luteoluSy subsp. n. 



Similar to {xwcfarax, but paler throughout. 



Size and general characters as in G.furax, but the facial 

 bands, the tips of the dorsal and caudal hairs, and the pale 

 short-haired line along the top of the tail are all much paler 

 in colour, being approximately "cream-buff" instead of 

 ochraceous buff. Underfur dull whitish buff, giving a con- 

 spicuously paler tone to the whole animal. Hairs of belly 

 tipped with pale butfy, the throat, chest, inguinal region, and 

 limbs being, as usual, black. Extreme tip of tail with a 

 small tuft of white hairs. Four pairs of mammte, all inguinal. 



Dimensions of the type (measured in flesh) : — 



Head and body 380 mm. ; tail 170; hind foot 60 ; ear 22. 



Skull : basal length 66"5 ; greatest breadth 41*3 ; mastoid 

 breadth 37"0; palatal length 33; length of p"" on outer 

 side 7*1 ; greatest diameter of m^ 5'2. 



Uab. Chulumani, Bolivia, 67° W., 16° S. Alt. 1800 m. 



Type. Old female. 13. M. no. 1. 6. 7. 27. Original 

 number 1305. Collected 31st December, 1900, by Perry O. 

 Simons ; presented by Oldheld Thomas. 



This form may be readily distinguished from the Brazilian 

 animal by its more creamy-buff colour, and especially by its 

 light underfur. 



Reithrodontomys modestus, sp. n. 



A small species of dark colour, with a short and uniformly 

 dark tail. 



Size about as in li. saturatus. General colour dark, nearest 

 to Ridgway's bistre, the sides more drabby, the dorsal area 

 rather blacker. Under surface soiled greyish (grey no. 6), 

 not sharply defined, the bases of the hairs blackish slate ; a 

 large patch between tlie fore limbs drab, like the lower flanks. 

 Ears short, uniformly blackish. Upper surface of hands 



