184 Mr. O. Thomas on new 
Eyes apparently very small. Fur very fine, long and silky ; 
hairs of the back 11-12 millim. in length. General colour 
above very finely speckled dark olivaceous grey, very uniform 
in tone all over. Top of muzzle rather blacker. Head like 
back, but the speckling rather coarser. Ears short, well-haired, 
blackish brown. Sides scarcely paler than back. Under 
surface brownish grey, the bases of the hairs plumbeous, 
their tips dull greyish; no line of demarcation on sides. 
Upper surface of hands and feet brown. ‘l'ail about the 
length of the head and body, very finely scaled, thinly haired, 
uniform dark brown throughout. 
Skull very thin and papery, the surfaces smoothly rounded 
and without ridges; muzzle narrow, evenly tapering, not 
irumpet-shaped anteriorly; interorbital broad, smoothly 
rounded ; interparietal minute; palatal foramina long, 
reaching nearly to the middle of m.’. 
Dimensions of the type (measured in the flesh) :— 
Head and body 92 millim.; tail 96; hind foot (s. u.) 22; 
ear 17, 
Skull: greatest length 27; basilar length 20°5; zygo- 
matic breadth 13°5; length of nasals 11; interorbital breadth 
57; breadth of brain-case 13; diastema 7°23; palate from 
henselion 11°6; palatal foramina 5°8 x 2°1; length of upper 
molar series 4°7. 
Hab. Limbane, Dept. Puno. Alt. 2600 m. 
Type. Female. B.M. no. 1.1.1. 48. Original number 
1126. Collected 6th July, 1900, by Mr. P. O. Simons. 
Four specimens examined. 
No one would take this remarkable little animal for anything 
but an Akodon without examining the skull; but the cranial 
characters show it to be a member of the group of Oxymyctert 
which contains O. bogotensis, Thos.*, and O. lanosus, Thos. t, 
from both of which it may be readily distinguished by its 
colour and proportions. 
Akodon pulcherrimus and its subspecies. 
Of the beautiful mouse discovered by Mr. Kalinowski at 
Puno, and described by me in 1897 ¢ under the above name, 
Mr. Simons has sent a number of examples from different 
localities in South-eastern Peru—Sumbay, Caylloma, Crucero, 
and the Inambari River; and Mr. Bernard Hunt has also 
* Acodon bogotensis, Thos. Ann, & Mag. Nat. Hist. (6) xvi. p. 869 
(1895). 
t Ann. & Mag. Nat. Hist. (6) xx. p. 218 (1897). 
$ «0m. cit, p. 549 (1897). 
