62 Mr. O. Tliomas o)i .\f animals from 



breadth i:)"5 ; nasals, length IT.'); iiiterorbital breailth 5'3 ; 

 breadth of brain-case 12-5 ; palate length 11*5 ; diastema 7-1 ; 

 length of palatal foramina 6 ; length of upp ;r molar series -i'G. 



Ti/pe. Male. Original number 803. Collected 25th 

 August, 1901. 



This distinct species may be readily recognized by the rich 

 ochraceous colour of the tips of its belly-hairs, the ochra- 

 ceous of its inguinal region, its general dark bistre colour, and 

 the proportions of its skull. 



Of A. arenicola I have had for comparison with it, besides 

 Darwin's type from Maldonado, a series obtained by myself 

 in 1896 at Colon, near Montevideo, whore I found it very 

 common. 



10. Akodon suhterraneus, Hens. 

 Five specimens. 



These specimens and three others from Piquete, Eastern 

 Sao Paulo, I refer provisionally to Hensel's species, from 

 which also I doubt if there is any sufficient reason to distin- 

 guish Leche's " var. Uenseliy Both are from Rio Grande 

 do Sul. 



But if, as is possible, the reddish-brown Microtus pine- 

 to rum Wke colour of the types of Lichtenstein's Mas nigrita 

 from Rio Janeiro, and Wagnei^s Hesperotnys faliginosus i'rom 

 Ypanenia, Sao Paulo, is in any way due to bleaching, these 

 names would also a])ply to the same species, as would, I 

 think, in addition Winge's llahrothrijc orycter from Lagoa 

 Santa, founded on an imperfect skull. In that case the species, 

 which would range from Lagoa Santa along the region of the 

 Serro do Mar to Rio Grande do Sul, would have to bear the 

 name of Akodun nigrita. 



11. Oxymycterus Jheringi, Thos. 



Oxymycterus Jherinf/i, Thomas, Anu. & Mag. Nat. Hist. (C) xviii. 

 p. 308 (1896). 



(J. No. 817. 1st Se|)tember. 



This is the first skin of the interesting annectant species 

 0. Iheringi which I have seen, the original series all having 

 been in spirit. The general colour should rather have been 

 described as grey than brown. 



The former s|)ecimens came from Rio Grande do Sul, so 

 that this is a northward extension of the range of the species. 



12. Loncheres nigrispina, Wagn. 



This specimen differs from the type by it.s dull-coloured 



