July 10, 1914 
/ ( D 0 ( 
VoL XXVII, pp. 109-112 
PROCEEDINGS 
OF THE 
BIOLOGICAL SOCIETY OF WASHINGTON 
A NEW BAT FROM MEXICO. 
BY GLOVER M. ALLEN. 
Through the kindness of Dr. James B. Rorer of the Trinidad 
Department of Agriculture, the Museum of Comparative Zoology 
has lately received a fine series of alcoholic bats of the em- 
ballonurid genus Rhynchiscus, collected by Mrs. Rorer on the 
Caroni River, in the Island of Trinidad. These excellent 
specimens have led me to make comparison with specimens 
from eastern Brazil and from the Yucatan Peninsula in the 
Museum collection. The type locality of Wied’s Vespertilio naso 
is the east coast of Brazil, whence the species ranges north¬ 
westward into southern Mexico. At the present time, although 
three other species have been named {rivaliH and saxatilis from 
Brazil, and lineata from Surinam), these are all currently re¬ 
ferred as synonyms to R. naso. A very careful comparison 
between the Trinidad specimens and a series from Porto Seguro, 
Brazil, assumed to be typical of naso, fails to show any important 
structural character whereby the two series may be distinguished. 
Four specimens from Quintana Roo, southern Mexico, however, 
differ conspicuously from the Brazilian examples in their smaller 
skulls and in the form of the anterior upper premolar, which 
in typical naso is a narrow, slender, lancet-shaped tooth without 
a distinct cingulum cusp, whereas in the Mexican skulls this 
tooth in side view is broadly triangular with a distinct cingulum 
cusp anteriorly and posteriorly. This well-marked race I 
propose to recognize as 
Rhynchiscus naso priscus subsp. nov. 
Type.— Skin and skull No. 13,208, Museum of Comparative Zoology, 
from Xcopen, Quintana Roo, Mexico; collected February 18, 1912, by 
James Lee Peters. 
25— pkoc. Biol. Soc. Wash., Vol. XXVII. 1914. (109) 
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