154 Fretp Museum or Natura History — Zod oey, Vor. X. 
constant characters separate them beyond dispute without considering 
the very marked cranial differences. 
Sciurus tricolor Péppig. 
Two specimens: Lagunas, Lower Huallaga River (1), Puerto 
Arturo, near Yurimaguas (1). 
These specimens, especially the one from Lagunas, come from very 
near Péppig’s type locality. They show an important variation in the 
color of the under parts, one being white throughout, except on the 
chin, and the other wholly rich orange rufous. The skulls, as noted by 
Thomas,” have very long narrow muzzles. This is accompanied by a 
greatly compressed mandible and extraordinarily broad thin lower 
incisors. These measure 5.5 mm. in depth and 24 mm. in length of 
exposed front surface, dimensions which exceed those of any other 
squirrel known to me. 
Mus musculus Linnzeus. Housrt Mouse. 
House mice are common in and about the coast towns. Two speci- 
mens from Pacasmayo were preserved. 
Epimys alexandrinus (Geoffroy). Roor Rat. 
After sporadic and poorly executed attempts to destroy them, rats 
are still abundant in the coast towns of Salaverry, Trujillo, and Pacas- 
mayo. The feeling that they are dangerous to the health of the com- 
munity is growing, however, and the more intelligent people are more 
and more inclined to make some effort to prevent their spread and in- 
crease. Apparently they have not penetrated far into the highlands, 
for we received no reports of them after leaving the coast until we 
reached Yurimaguas, where we again found them numerous. 
Oryzomys stolzmanni Thomas. STOLZMANN’s Oryzomys. 
Forty-one specimens: Mountains east of Balsas (1), Tambo Almi- 
rante, near Uchco (8), Moyobamba (32). 
Huambo, the type locality of Oryzomys stolemannt, is less than 50 
miles directly south of Tambo Almirante, on the same slope of the 
mountains, and at nearly the same altitude. Moreover, the local 
conditions are much alike at the two places, the forest dense, and the 
* Ann. & Mag. Nat. Hist. (7), VI, p. 138, July, 1900. 
