1860. _Stenoderma toltecus_ Saussure, Revue et Mag. Zool.,
Paris, ser. 2, 12:427, October, type from Mexico. Type
locality restricted to Mirador, Veracruz, by Hershkovitz,
Proc. U. S. Nat. Mus., 99:449, May 10, 1949.
1908. _Artibeus toltecus_, Andersen, Proc. Zool. Soc.
London, p. 296, April 7.
_Distribution in Tamaulipas._--Probably lowlands of southern
part of state; known presently only from Rancho Pano
Ayuctle.
_Artibeus toltecus_ is closely related to another species, _A.
aztecus_, that occurs also in Tamaulipas. Externally, _toltecus_
differs from _aztecus_ in being smaller and darker; cranially,
_toltecus_ also is the smaller and the P2 and M2 are more angular
lingually than in _aztecus_, in which the teeth are rounded. One of the
most important differences between these two species is that they occur
at different altitudes. Davis (1958:165) reported that _toltecus_
occurred at elevations below 5000 feet at more southerly localities in
Mexico, whereas _aztecus_ occurred above 5000 feet. In Tamaulipas the
two species probably have parallel distributions from south to north
but _A. toltecus_ is known from Rancho Pano Ayuctle at an elevation of
300 feet in rain forest, whereas _A. aztecus_ is known from Rancho del
Cielo at an elevation of 3300 feet in cloud forest. The two localities
are only four miles apart.
One of the specimens examined (GMS 10640) is smaller, cranially and
externally (see beyond), than any recorded by Davis (1958:165).
_Measurements._--Some external and cranial measurements of
two females and a male (GMS 10668, 10646 and 10640) are,
respectively, as follows: length of hind foot, 12.5, 12.0,
11.0; length of ear from notch, 15, 17, 15; length of
forearm, 40.5, 40.0, 36.5; greatest length of skull, 20.9,
20.7, 19.7; zygomatic breadth, 12.3, 12.3, 11.7; least
interorbital constriction, 5.2, 5.0, 5.0; length of
maxillary tooth-row, 6.8, 6.8, 6.5; breadth of braincase,
9.3, 9.2, 9.1.
_Records of occurrence._--Specimens examined, 3 from Rio
Sabinas, near Gomez Farias (Rancho Pano Ayuctle) (GMS).
=Artibeus aztecus= Andersen