This small toad apparently is restricted to the Pacific lowlands from the Isthmus of Tehuantepec eastward to Guatemala. At Zanatepec on July 13, 1956, males were calling from a flooded field bordered by scrub forest. The call is a rather loud nasal racket. Living individuals vary greatly in coloration. Some have yellowish tan flanks and dorsum and an orange middorsal stripe; others have a pale red dorsum, yellow flanks, and a cream middorsal stripe (Pl. 6, fig. 2). =Bufo coccifer= Cope _Oaxaca_: Juchitan (5); Tehuantepec. It is with some degree of hesitancy that these toads are referred to the species _coccifer_. Although these and other specimens from Guerrero and Michoacan display no striking differences from specimens from Costa Rica, Nicaragua, and southeastern Guatemala, the ranges of the populations are separated by a broad hiatus in Chiapas and Guatemala. Possibly this species has utilized the sub-humid corridor through northern Central America (Stuart, 1954) and subsequently disappeared from the corridor in Guatemala and Chiapas. Specimens of a _coccifer_-like toad collected by Stuart in the vicinity of Jacaltenango, Departamento Huehuetenango, Guatemala, are much larger than either the Central American or Mexican specimens of _coccifer_. A final commitment on the systematic status must await a thorough study of this group of toads. Males of this species were calling from a grassy rain-pool in open scrub forest at the edge of Juchitan on July 6, 1956. The call is a low "whirrr." The calling males were sitting in the shallow water at the edge of pond, where they were hidden by the grass. None was observed in open water, as is characteristic of calling males of _Bufo canaliferus_ and _marmoreus_. =Bufo marinus= Linnaeus _Oaxaca_: Agua Caliente; Guichicovi (3); Mixtequilla; Tolosita (6); Tehuantepec (37); Tuxtepec; Union Hidalgo. _Veracruz_: Ciudad Aleman (4); Cosamaloapan; Cuatotolapam (19); 20 km. SE of Jesus Carranza (4); 38 km. SE of Jesus Carranza (10); 20 km. NE of Jesus Carranza (4); Novillero. This large toad is abundant throughout the lowlands of the isthmus. The loud rattling call of males was heard on rainy nights throughout the summer. In March, 1956, several adults were found in a small cave back of a spring at Agua Caliente. =Bufo marmoreus= Wiegmann _Oaxaca_: Cerro San Pedro (2); Chivela (5); Escurano (3); Juchitan; Salina Cruz (101); Santa Lucia (2); 12 km. S of Santiago Chivela (11); Santo Domingo; Tapanatepec; Tehuantepec (100); Tequisistlan. _Veracruz_: Alvarado; Coatzacoalcos. This toad is abundant on the Pacific lowlands, where it inhabits both open and dense scrub forest. On the Gulf lowlands its distribution seems to be limited to xeric coastal habitats. Aside from the specimens from Alvarado and Coatzacoalcos, it is known in Veracruz only from Boca del Rio (Langebartel and Smith, 1959:27).