Thomas. — new species of aconíf:mys 
39 
R new 5pccie5 of ficonaemyj from Southern Chili (*) 
B Y 
Oldfield THOHAB 
The British Museum has recently received from Mr. 
J. A. Wolffsohn a specimen of the rare genus Aconcemys 
[Schi^odon, "Waterh.) which had been presented to him 
by the well-known naturalist Carlos E. Porter. The 
species proving to be new, 1 propose to name it in 
honour of the latter, to whom the Museum has been 
indebted for help in various ways. 
Aconsemys Porteri, sp. n. 
Fur more woolly than in A. fuscus; tail more com- 
pletely bicolor; incisors stouter. 
Size about as in ^. fuscus or rather smaller. Far soft, 
more woolly, less straight than in A. fuscus, the general 
texture and the colour both suggesting that of a European 
water-vole (Arvícola amphibius). General colour deep rich 
brown, near "auburn" of Ridgway, the subterminal rings 
on the hairs dull cinnamon. Under surface similar but 
rather warmer in tone, the ends of the hairs rich cinna- 
mon. Hands and feet greyish white, the middle part of 
the metatarsus rather darker. Tail rather longer than in 
A. fuscus and completely bicolor, black above and creamy 
whitish below for its whole lenght; in A. fuscus the ter- 
minal part of the under surface is brown. 
(*) El roedor aquí descrito es el a que se refiere el N." 11 de la 
Crónica de nuestra «Jíeiisfa», del año pasado (p. 119). Trascribimos el 
presente trabajo del número de Marzo de 1917 de los Annals de Ma- 
gazine of Natural History, pp. 281-282 que acabamos de recibir, en 
beneficio de los interesados en estos estudios de nuestro país, que no 
reciban la importante revista inglesa. — (Nota de la Redacción). 
