South- American Mammals. 237 



Rnn(/c. Pern (Tnambari River). 



fi/p''. Lenoxun apical is [Oxi/mj/cterus apicah's, Alleti). 



As I noticed in 1901 *, this striking species lias none of 

 tlio peculiar appearance characteristic of Oxymycterus, and 

 there is no duuNt it sluuild form a distinct genus. 



MicroxuSj gen. nov. 



Form normal, mouse-like, or rather yl/:6»(/c)/j-like. Muzzle 

 not elongate. Foio feet normal, Jiot fo.ssorial, the claws 

 small and the pollical nail nut pointed. Tail shorter than 

 head and body. 



Skull like that of a small Akodon, except for the charac- 

 teristic narrow zygomatic |)late; smooth and rounded, without 

 ridges, the muzzle of normal size and shape ; nasals not ex- 

 panded anteriorly, extending posteriorly to the line of the 

 front of tlie orI)it. 



liange. South America, from Bogota to Straits of Mngellan. 



Type. Microxus mimus [Oxymycterus mimus, Thos., 1901). 

 Other species : M. bogotensis {Akodon boyotensis, Tlios., 

 1S95), J/, lanosus (^Oxymycterus lanosiis, Tiios., 1897), an<l 

 M. iheriiigi {Oxymycterus iheriugi, Thos., 189G). 



That tlie first three of the species assigned to this gcnu^ 

 had a special inter-relationship was indicated when M. viimus 

 was described in 190l f- Their skulls are remarkably 

 similar to each other. On the other hand, M. iheringi is less 

 typiciil, showing a distinct tendency towards the peculiar 

 characteristics of Oxymijcterus. 



(Jood figures of skulls representing all three of the genera 

 of this group now recognized have been published by 

 Dr. Allen in his tine work on the Mammals of ^Southern 

 Patagonia J. 



Oxymycterus angularis, sp. n. 



Allied to 0. hisj'idus, but with shorter tail and with a 

 curved, almost angular, front edge to the zygomatic plate. 



Size and colour about as in O. hixpidus^ as represented by 

 a scries from Espiritu Santo. Tiie upper surface dull bistre- 

 brown, becoming rather warmer on the [losterior back, where 

 the light rings on the hairs, butty anteriorly, become more 

 ochraceous. Sides- lather lighter. Under surface d.irk 

 greyish, the tips of the hairs buffy. Ears, hands, and leet 



• Aun. & Mag. Nat. Hist. (7) vii. p. 189 (1901). 



t Tom. cit. p. 18t. 



I Rep. Princeton llxf. iii. pt. i. plf. ix. & x. <V*(^^^ > 



