_Oaxaca_: 30 km. N of Matias Romero; Rio Sarabia (5); Tapanatepec (87); Tolosita (6); between Zanatepec and Tapanatepec. _Veracruz_: 25 km. SE of Jesus Carranza; 35 km. SE of Jesus Carranza (2); 22 km. SSW of Jesus Carranza; 20 km. ENE of Jesus Carranza (7); Minatitlan; Tapalapan (5). For the purposes of the present study I am not recognizing _Eleutherodactylus beati_, _E. dorsoconcolor_, and _E. venustus_ as specifically, or even subspecifically distinct from the earlier named _E. rhodopis_. Probably these are mere color varieties of a single species. In the dry season frogs of this species were in humid forests, where they were most frequently found along small streams and in ravines. The species is widespread in the Gulf lowlands, but does not occur on the Plains of Tehuantepec. It does inhabit the Pacific slopes on the foothills of the Sierra Madre de Chiapas, the western part of which extends into eastern Oaxaca near Tapanatepec. =Eleutherodactylus rugulosus= Cope _Oaxaca_: La Princesa (30); Modelo; Santa Lucia (10); Tapanatepec (26); Tehuantepec (6); Tres Cruces (8). _Veracruz_: Tapalapan (5). In addition to the specimens from the lowlands of the isthmus, for the purposes of the following discussion, I have included data on two specimens from the southern slopes of the Sierra del Sur in Oaxaca (Mirador and Chacalapa) and on several specimens from Los Tuxtlas in Veracruz (Los Chaneques, 67; Salto de Eyipantla, 35; and San Andres Tuxtla, 11). Frogs of the _Eleutherodactylus rugulosus_ complex occur from southern Veracruz and Sinaloa southward through Central America. Taylor (1940:401) described _E. vocalis_ from Hacienda El Sabino, Michoacan; Taylor and Smith (1945:580) described _E. avocalis_ from Tres Cruces, Oaxaca. These have been considered as species distinct from _rugulosus_, which is known to occur in Veracruz, Guerrero, and Chiapas southward into Central America. Although the large number of specimens collected in the isthmus does not aid in defining the ranges of the taxa involved, these specimens do give some idea of the variation in certain characters in a given population.