PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM ~ 
issued 
SMITHSONIAN INSTITUTION 
U. S. NATIONAL MUSEUM 
Vol. 97 Washington : 1948 No. 3214 
MAMMALS OF NORTHERN COLOMBIA 
PRELIMINARY REPORT No. 2: SPINY RATS (ECHIMYIDAE), WITH 
SUPPLEMENTAL NOTES ON RELATED FORMS 
By Puivie HersuxKovirz 
The echimyid rodents collected by the author in northern Colombia 
during his tenure of the Walter Rathbone Bacon Traveling Scholar- 
ship ! include 5 specimens of Echimys semivillosus (I. Geoffroy) and 
150 specimens representing Proechimys guyannensis E. Geoffroy ? 
and P. canicollis (Allen). The only other echimyid rodent previously 
recorded from the region under study is Diplomys rufodorsalis Allen 
from Onaca, near Santa Marta. Possibly a form of Hoplomys occurs 
somewhere in the lowlands of northern Colombia, and a representa- 
tive of Thrinacodus, perhaps T. edazx, in the highest levels of that 
part of the Cordillera Oriental visited by the author. 
In the following account some of the taxonomic problems presented 
by the species collected are discussed, involving a more extensive 
treatment of the genus Proechimys than is implied by the geographical 
limitations of the title of this report. For this the author has drawn 
information from his notes on the type specimens of Proechimys in 
the British Museum and in the various American institutions, as well 
as from considerable supplementary material. Thanks are expressed 
1The northern Colombian and western Venezuelan localities mentioned in the text are shown on the 
map accompanying the first preliminary report on the mammals of northern Colombia, Proc. U. S. Nat. 
Mus., vol. 97, pp. 1-46, fig. 1, 1947. In this report the symbol combinations for contrasting color patterns of 
squirrels given on page 9, subheading 4c, next to last line, as 4ab and 4ac should read 4ac and 4hbe, respectively. 
Corresponding changes in the text are as follows: Page 17, line 3 for 4a read 4b, line 22 for 4ac read 4be, 
page 24, line 23 for 4ab and 4ac read 4ac and 4be, respectively, line 38 for 4ab read 4ac, line 40 for 4ac read 
4be. Thesymbols in table 1, page 34, are correct. On pages 9 and 36 read candelensis for candalensis; page 36 
line 6, read versicolor for inconstans; on pages 6, 7, 10, 21, 22, 29, 32, 33, and 36 read chrysuros for chrysurus, 
2 Antedates cayennensis Desmarest. 
757450—48 125 
