Taylor and Smith (1945:552) revived Wiegmann's _Bufo horribilis_ for the large toads of México that are here referred to _B. marinus_. Their action was based upon the supposition that the "species _marinus_" is composite. Although probably true, this supposition has yet to be proved. Until the large, and apparently related, species of _Bufo_ inhabiting tropical America have been studied systematically as a unit, the recognition of segments of the population as either species or subspecies is meaningless. Taylor and Smith (op. 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 México 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, México. Barranca de Bejuco; Coahuayana (11); El Diezmo (2); La Placita (9); La Orilla (12); Motín del Oro; Ostula (9); Playa Azul (5); Pómaro (15); Salitre de Estopilas; San Pedro Naranjestila. In Michoacán this species is confined to elevations of less than 1000 meters on the coast and foothills of the Sierra de Coalcomán. 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.