2004 
VOSS ET AL.: BOLIVIAN MARMOSOPS 

24 
Marmosops 
B impavidus + noctivagus 
@ noctivagus 
A ocellatus 
Fig. 12. Collection localities of Marmosops impavidus, M. noctivagus, and M. ocellatus in Bolivia. 
Numbers are keyed to gazetteer entries in appendix 2. 
Marmosops noctivagus 
This appears to be the appropriate name 
for the most-frequently collected species of 
Marmosops in north-central Bolivia (fig. 12); 
we consider albiventris, dorothea, keaysi, 
and yungasensis to be synonyms, as ex- 
plained below. The name noctivagus is based 
on Peruvian type material that we have not 
examined, but a series of AMNH specimens 
from the Andean piedmont (<1000 m) near 
Tarma in the department of Junin are more- 
or-less topotypical, and we have a large se- 
ries of very similar specimens from Loreto. 
One Bolivian specimen from La Paz (USNM 
579250) and three from Pando (AMNH 
262402—262404) closely resemble this low- 
land Peruvian material and could be referred 
to the nominotypical subspecies (M. n. noc- 
tivagus) if a trinomial nomenclature were 
needed. This material comprises relatively 
