186 Mr. 0. Thomas on new 



riorly, and laterally there is a broad band of the general dark 

 colour connecting the cheeks and flanks and dividing it from 

 the white belly-colour. 



Dimensions of the type : — 



Head and body 110 millim. ; tail 80; hind foot, s. u. 24, 

 c. n. 26*5 ; ear 23. 



Hab. Limbane, on the Inambari River, Upper Madre de 

 Dios. Alt. 3400 m. 



Type. Female. B.M. no. 1. 1. 1. 41. Original number 

 1150. Collected 26th July, 1900, by Mr. P. O. Simons. 

 One specimen only. 



4. Akodon pulcherrimus cruceriy subsp. n. 



General colour olivaceous, the rufous tone disappearing from 

 the brown and leaving an olivaceous not unlike that of 

 Akodon longipilis or macronyx. Auricular patch small, sur- 

 passed by the ears and more or less separated from the white 

 of the throat. 



Dimensions of the type : — 



Head and body 100 millim. ; tail 87 ; hind foot, s. u. 28, 

 c. u. 25"5 ; ear 22. 



Average measurements of four adults : Head and body 98 ; 

 tail 79; hind foot 23; ear 21-5. 



Hah. Crucero, on the pass between Puno and the Upper 

 Inambari. Alt. 4550 m. 



Type. Female. B.M. no. 1. 1. 1. 45. Original number 

 1167. Collected 29th July, 1900, by Mr. P. O. Simons. 

 Four specimens examined. 



In general appearance, owing to its different dorsal colour, 

 this race seems the most distinct of all. 



List of the Mammals as yet known from the Inambari River. 



Dr. Allen's recent paper [l. c.) gives an account of some 

 mammals collected by Mr. H. H. Keays, nominally at 

 " Juliaca, in South-eastern Peru, a little to the westward of 

 Lake Titicaca " ; but it is clear, both by the latitude and 

 longitude given (13° 30' S., 70° W.) and by the species 

 represented, all of which are Amazonian and not Titicacan, 

 that the collection is from the Rio Inambari, where, as a 

 matter of fact — at Santo Domingo — Mr. Simons found 

 Mr. Keays at work. There may be another Juliaca on the 

 Inambari, or, more probably, Mr. Keay's letters and collec- 

 tions came via Juliaca, Titicaca, and that thus the mistake 

 arose. 



