1821. _Artibeus Jamaicensis_ Leach, Trans. Linn. Soc.
London, 13:75, type from Jamaica.
_Distribution in Tamaulipas._--Tropical region of southern
part of state.
The specimens from northwest of El Encino were shot deep (250 yards) in
a cave; specimens of _Myotis nigricans_ were obtained in the same cave.
A female taken on May 24 carried a single embryo that was 43 mm. in
crown-rump length. Six March-taken females reported by de la Torre
(1954:114) had one embryo each that varied from 20 to 38 mm. in length.
_Artibeus jamaicensis_ and _A. lituratus_ are the largest bats known
from Tamaulipas. In addition to the differences between the two species
pointed out by Lukens and Davis (1957:9), I note, in Tamaulipas at
least, that the postorbital constriction is narrower in relation to the
condylobasal length in _lituratus_, 24.6 (23.7-26.0) per cent as
compared to 27.9 (26.7-29.9) per cent in _jamaicensis_.
_Records of occurrence._--Specimens examined, 19: 10 km. N,
8 km. W El Encino, 400 ft., 10; Aserradero del Paraiso, 19
km. N Chamal (by road), 8 (AMNH); Cueva El Pachon, 5 mi. N
Antiguo Morelos, 1 (AMNH).
Additional records: Rancho Pano Ayuctle (de la Torre,
1954:114); 4 mi. N Antiguo Morelos, near El Pachon
(_ibid._).
=Artibeus lituratus palmarum= J. A. Allen and Chapman