The Amphibians and Reptiles of Michoacán, México

by William Edward Duellman

Fig. 5. Tadpole of Bufo occidentalis (UMMZ 94269) from Barranca Seca, Michoacán. × 3.

Fig. 6. Mouthparts of larval Bufo occidentalis (UMMZ 94269) from Barranca Seca, Michoacán. × 20.

Forty recently metamorphosed individuals average 18.9 mm. in snout-vent length.

The relationships of this toad seem to be with Bufo bocourti Brocchi, an inhabitant of pine and oak forests in the uplands of Chiapas and Guatemala. In Bufo occidentalis the tympanum usually is indistinct and sometimes completely covered, and it is absent in bocourti. Bufo occidentalis has a broader interorbital area and relatively shorter and more rounded parotid glands than bocourti. The tadpoles of the two species are nearly identical (see Stuart, 1943:12).

Leptodactylus labialis (Cope)

Cystignathus labialis Cope, Proc. Amer. Philos. Soc., 17:90, 1877.—No type locality designated; type locality restricted to Potrero Viejo, Veracruz, México, by Smith and Taylor (1950a:350).

Leptodactylus labialis, Brocchi, Mission Scientifique au Mexique et dans l'Amerique Centrale, pt. 3, sec. 2, livr. 1:20, 1881.

Apatzingán (26); Capirio (5); Cofradía (9); El Sabino (4); Lombardia; Río Tepalcatepec, 27 km. S of Apatzingán (2).