cit.:553) based the
description of a new species, _Bufo angustipes_, on one rather
emaciated, formalin-hardened female from La Esperanza, Chiapas. The type
(USNM 116513), when compared with numerous specimens of _Bufo marinus_
from throughout the range of the species in Mexico and northern Central
America, displays no combination of characters to set it off from the
others. Therefore, I suggest that _Bufo horribilis_ Wiegmann and _Bufo
angustipes_ Taylor and Smith be placed in the synonymy of _Bufo marinus_
(Linnaeus) until future systematic study of the genus and this species
in particular establishes the existence of recognizable taxa.

~Bufo marmoreus~ Wiegmann

_Bufo marmoreus_ Wiegmann, Isis von Oken, 26:66,
1833.--Veracruz, Veracruz, Mexico.

Barranca de Bejuco; Coahuayana (11); El Diezmo (2); La
Placita (9); La Orilla (12); Motin del Oro; Ostula (9);
Playa Azul (5); Pomaro (15); Salitre de Estopilas; San Pedro
Naranjestila.

In Michoacan this species is confined to elevations of less than 1000
meters on the coast and foothills of the Sierra de Coalcoman. In this
region in the months of June and July, breeding congregations have been
found in temporary pools and along streams.

Smith and Taylor (1948:39), in their key to the Mexican species of
_Bufo_, placed emphasis on the nature of the supraorbital and
postorbital crests (whether they form a curve or a sharp angle) in
distinguishing _Bufo marmoreus_ from _Bufo perplexus_. In the original
description of _perplexus_, Taylor (1943a:347) characterized the species
as follows: supraorbital and postorbital crests forming a sharp angle,
instead of a curve as in _marmoreus_; supratympanic crest smaller than
in _marmoreus_; diagonal lateral stripe lacking in females;
concentration of dorsal tubercles as found in _marmoreus_ lacking in
males. The discovery of specimens in which the crests form a curve and
others in which the crests form an angle in both the Tepalcatepec Valley
and in the coastal lowlands prompted an investigation of these
characters and others throughout the ranges of the species. An
examination of 410 specimens has resulted in the following conclusions.

TABLE 1.--VARIATION IN THE SHAPE OF THE SUPRAORBITAL AND POSTORBITAL
CRANIAL CRESTS IN BUFO MARMOREUS AND B. PERPLEXUS.

+------------------------+---+-----------+------------+----------+
|LOCALITY | N | Curved |Intermediate| Angular |
+------