1906. _Artibeus aztecus_ Andersen, Ann. Mag. Nat. Hist.,
ser. 7, 18:422, December, type from Tetela del Volcan,
Morelos.
_Distribution in Tamaulipas._--Probably higher areas of
southern part of state; known presently only from Rancho del
Cielo.
I follow Davis (1958:165) in treating _A. aztecus_ and _A. toltecus_ as
distinct species. Differences between the two are discussed in the
preceding account of _toltecus_.
One specimen examined (AMNH 146980) is distinctly larger than the
others here assigned to _A. aztecus_, but does not exceed the maximal
measurements given by Davis (_loc. cit._) for the species. This
specimen also has a narrower M2, and relatively and actually narrower
braincase than other specimens (see measurements).
Specimens from Rancho del Cielo were collected in a limestone cave in
the cloud forest. A female taken on July 2 carried a small embryo and
another obtained on August 14 had an embryo that appeared to be nearly
ready for birth.
_Measurements._--Respective external and cranial
measurements of three males (AMNH, uncatalogued) and a
female (AMNH 146980) are as follows: total length, 58, 65,
66, 73; length of hind foot, 13, 12, 12, 13; length of
forearm, --, 43, 40, 41; greatest length of skull, 21.6,
22.4, 21.5, 23.0; zygomatic breadth, 13.0, 12.8, 13.0, 12.4;
least interorbital constriction, 5.2, 5.7, 5.5, 6.0; length
of maxillary tooth-row, 7.0, 7.1, 6.9, 7.1; breadth of
braincase, 10.0, 9.8, 10.0, 9.5.
_Records of occurrence._--Specimens examined, 7, all from
Rancho del Cielo, 3300 ft., (AMNH).
=Enchistenes hartii= (Thomas)