A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, México

by William Edward Duellman

Fig. 1. Calling male of Engystomops pustulosus, photographed in a pond west of Tehuantepec, Oaxaca, on July 5, 1956. × 2.

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Fig. 2. Foamy egg mass of Engystomops pustulosus at the edge of a pond west of Tehuantepec, Oaxaca. July 5, 1956. × 3/8.

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PLATE 8

Fig. 1. Calling male of Diaglena reticulata, photographed at a pond north of Salina Cruz, Oaxaca, on July 6, 1958. × 1/2.