Zoological Society. 483 
sand, and now and then turns round and protrudes its head out of 
the new-made burrow. It was then our only chance to shoot them, 
and if not killed on the spot, there is no hope of obtaining them. 
Only in one or two instances do I remember seeing them leave their 
holes to feed on the grass. I think you will find this animal distinct 
from all the other South American Rodents, and perhaps it will form 
the type of a new genus. Its native name is ‘Tufo’ and ‘ Tojo,’ 
pronounced ‘ Tu-fo’ and ‘ To-ko.’ 
«3. A large Mouse, with soft fur and large ears*. This charming 
little animal we found in the same locality as the above, inhabiting 
the abandoned caves of the former species. It makes its appearance 
in the afternoon, when the sun is nearly on the horizon, to feed on 
grass, and is often seen sitting on its hind legs; and it then presents 
its pretty white abdomen and erect ears. In this position it has the 
appearance of a rabbit in miniature. The natives call it ‘ Achohalla,’ 
pronounced ‘ Ha-cho-ha-ya.’ 
“TI have taken the Didelphis Azare with a litter of eight young 
ones. I have not forwarded this animal with the others; it will re- 
main till my return to Chile; also several species of Mice and Bats. 
“In ornithology I have been very successful, having obtained 
about 100 species differing from the birds of Chile. I have found 
a considerable portion of the birds figured in D’Orbigny’s splendid 
work, and before I leave Bolivia I hope to obtain the greater part, 
especially as in a few days I intend leaving Cochabamba and tra- 
velling down the river Mamoré towards the frontiers of Brazil, 
traversing the country of the Yaracares Indians, where D’Orbigny 
found an immense number of novelties. 
“‘Amongst the Perdicare I have found a beautiful species of En- | 
dromia, differing from E. elegans of D’Orbigny ; also a third species 
of Tinachorus, much larger than T. D’ Orbignyanus ; and in the valley 
of Cochabamba and mountains in the vicinity I have of late had the 
good fortune to take three distinct species of Nocthura, all of beauti- 
fully marked plumage, and different from N. Perdicaria of Chile. 
These have given me excellent sport. Amongst many other inter- 
esting birds which I have lately taken, I have found Serrirostrum 
carbonarium and sittoides. My intention is, before I leave Cocha- 
bamba, to write a communication to the Zoological Society, having 
now the honour to be a Corresponding Member, giving them a brief 
idea of what I have accomplished since I arrived in this country, 
I have no doubt that the Earl of Derby and the Messrs. Gray will have 
much pleasure at the sight of the Bolivian birds when they arrive in 
England. I have many interesting insects, amongst which there are 
three species of Nyctelia and two or three of the genus Phaneus, with 
others which I am sure will afford you pleasure and amusement.” 
HzsPERoMYs BOLIvVIENSIS. Hesp. pallide ochraceus, corpore supra 
Susco-penicillato, subtis albo; pedibus albis flavo-lavatis ; caudéd 
quoad longitudinem corpus feré equante, albd, supra flavd;: auri- 
bus permagnis, extus rufescenii-flavis. 
* Hesperomys boliviensis, a new species hereafter described.—G, R. W. 
