PDF - Wallace Online

CHAP. XVII.] MAMMALIA. 239
of Panama. The genera are as follows :
—
Dadylomys (2 sp.),
Guiana and Brazil ; Cercomys (1 sp.), Central Brazil ; Lasiuromys
(1 sp.), San Paulo, Brazil; Petromys (1 sp.), South Africa; Myopotamus
(1 sp.), the eoypu, on the East side of the Andes from
Peru to 42° S. lat., on the West side from 33° to 48° S. lat.
Carterodon (1 sp.), Minaes Geraes, Brazil ; Aulacodcs (1. sp.).
West and South Africa ; Mesomys (1 sp.), Borba on the Amazon
Echimys (11 sp.), from Guiana and the Ecuadorian Andes to
Paraguay ; Lonchcres (10 sp.), New Granada to Brazil.
Fossil and Extinct Eddmyidce.—The genus Carterodon was
established on bones found in the Brazilian caves, and it was
several years afterwards that specimens were obtained showing
the animal to be a living species. Extinct species of Myopo-
tamus and Loncheres have also been found in these caves, with
the extinct genera Lonchophorus and Phyllomys.
No remains of this family have been discovered in North
America ; but in the Miocene and Upper Eocene deposits of
France there are many species of an extinct genus Theridomys,
which is said to be allied to this group or to the next (Cercola-
bidse). Aulacodon, from the Upper Miocene of Germany, is
allied to the West African Aulacodes ; and some other remains
from the lower Miocene of Auvergne, are supposed to belong to
Echimys.
Family 66.—CEECOLABTD^. (3 Genera, 13-15 Specips.)
Neotropical
Sub-regions.
NeARCTIC
SCB-REGIONS.
— 2.3— 11. 2. 3. 4
General Distribution.
Pal^arctic
Sub-regions.
Ethiopian
Sub-regions.
Oriental
Sub-regions.
;
Australian
Sub-regions.
The Cercolabidse, or arboreal porcupines, are a group of rodents
entirely confined to America, where they range from the northern
limit of trees on the Mackenzie Eiver, to the southern limit of
forests in Paraguay. There is however an intervening district,
the Southern United States, from which they are absent. Ere-
tJiizon (3 sp.), the Canadian porcupine, is found throughout