yf'immals from Peru and Bolivia. 185 



contributed some additional specimens from Caylloma. These 

 localities show that the species ranjjcs over a qiiadranj;iilar 

 area some 200 miles each way between about (J9^ and 72^ VV. 

 and 13° aii.l lO^ S. 



But the specimens from the different localities are not all 

 identical, falliii<T; into four fairly separable subspecies, those 

 from Sumbay being apparently typical, while each of the 

 other places above mentioned has its own local form. 



All are, however, so alike in general characters and agree 

 so closely with the original description that there is no need 

 for a detailed account of eacli, the differential characters and 

 the dimensions being alone given. 



1. Akodon pulcherrimus (typical). 



Back fuscous brown, not darkening laterally, the sides if 

 anything paler than the back. White ear-patch large, ex- 

 tending backward beyond the ears when these (dry) are folded 

 hack, continuous below with tlie white of the under surface, 

 or, rarely, with a faint darker wash separating the two. 



H(d>. Puno {Kalinowski) ; Sumbay, near Arequipa (^V/nons). 

 Alt. 4000 m. 



Average measurements of five specimens from Sumbay : — 



Head and body SO-H millim. ; tail 72-8 ; hind foot (s. u.) 23 ; 

 ear 19. 



2. Akodon pulcherrimus cayllomce, subsp. n. 



Like the typical form as to general colour and ear-patch, 

 but the sides darkening instead of lightening as they approach 

 the white of the belly, so that an indistinct blackish line is 

 formed edging the clear white of the belly. 



Dimensions of the type (taken in the flesh) : — 



Head and body 9-1 millim. ; tail 82 ; hind foot 23 ; ear 20. 



Average measurements of four adults : Head and body Ul"? ; 

 tail 75"2 ; hind foot (s. u.) 22*2; ear iy"5. 



Ilah. Caylloma. Alt. 4300 m. 



Type. Female. B.M. no. 0. 10. 1. 74. Collected 14th 

 .June, 1900, by Mr. P. O. Simons. Six specimens examined, 

 of which Mr. Simons obtained four and Mr. Hunt two. 



Two young specimens show the dark lateral marks parti- 

 cularly well. 



3. Akoilon pulcherrimus inambarii^ subsp. n. 



Like the typical form as to colour, but the light ear-patch 

 is so much reduced that the laid-back cars surpass it poste- 



