1882. ] MR. QO. THOMAS ON RODENTS FROM PERU. 99 
vinces of Jaen and Chota. Tambillo is situated about 5700 feet 
above the level of the sea, upon the eastern slope of the western 
chain of the Cordilleras (6° S. lat.). 
Cutervo.—A town in the province of Chota, department of Caja- 
perce. about twodays south of Tambillo, on the same slope, 9000 
eet. 
Callacate.—A colouy, 4800 feet in altitude, about 8 miles north- 
west of Cutervo, on the banks of the river Chota, which runs into 
the Amazon under the name of Chamaya. 
Chirimoto!.—A colony in the valley of the Huayabamba, a tributary 
of the Huallaga, in the province of Chachapoyas. It is about 5400 
feet above the sea, upon the eastern slope of the eastern chain of 
the Cordilleras (6° S. lat.). 
Huambo'.—A plantation in the forest of the same name, to the east 
of Chachapoyas and Chirimoto, 3700 feet in altitude, on the banks of 
the river Huambo, a tributary of the Huallaga. 
All these localities, except Tumbez, are on the northward 
Andean extension of the Patagonian subregion, as defined by 
Messrs. Newton and Salvin’; so that we should naturally expect, as 
indeed turns out to be the case, that most of the species would be 
the same as those found by Mr. Louis Fraser, who collected at 
places situated in the Ecuadorean part of this same Andean tract. 
Tumbez is on the southward extension of the Subandean subregion on 
the Pacific side; but the specimens collected there are too few to 
draw any deductions from. 
The chief interest of the collection centres in the fine series of 
Hesperomys contained in it ; for of this difficult genus and the closely 
allied one Holochilus M. Stolzmann obtained just over 40 speci- 
mens. The value of this additional material may be perceived when 
it is remembered how very few of the specimens in the various 
museums are preserved in spirit, or have their exact localities or 
habits recorded. 
On account, therefore, of the fact that most of the published de- 
scriptions have been taken either from stuffed specimens or skins, 
I have thought it useful to give the measurements of every adult 
Specimen in this collection, even when belonging to compara- 
tively well-known species. It must, moreover, be remembered that 
from such a locality as Northern Peru very few species of this 
group can in any sense be called well known; in fact, of the 11 
species of Hesperomys and Holochilus here described, only two, Hes- 
peromys longicaudatus and olivaceus, at all deserve this term; and 
even of these, additional measurements are much to be desired, as 
helping to show the range of variation found among the South- 
American Muridee. Of the 11 species just referred to, only one belongs 
to Holochilus, the remaining ten being distributed among Calomys, 
Rhipidomys, and Habrothrix, three of the eight subgenera of Hes- 
' Additional information concerning these two localities may be obtained from 
Prof. Taczanowski’s own paper on the birds collected by Mons. Stolzmann 
(antea, p. 2). 
* Encycl. Brit, ed, 9, iii, p. 744. 
