80, pp. 211-218 1 December 1967 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON TWO NEW ELEUTHERODACTYLUS FROM WESTERN MEXICO (AMPHIBIA; LEPTODACTYLIDAE ) By John D. Lynch^ Department of Zoology and Museum of Natural History University of Illinois, Urbana One of the most abundant and conspicuous elements of the American tropics is the frog genus Eleutherodactylus. More than 300 species are known ranging throughout the West Indies, Middle America and South America. Within so large a genus, numerous species groups are known but as yet no subgeneric units have been diagnosed. In Mexico and north-em Central America one finds eight species groups. Some of these are lower Central American or South American groups that have invaded Mexico but a few are autochthonous ele-ments of southern Mexico and Guatemala. One of these autochthonous elements is the spatulate-toed alfredi group containing 13 taxa, two new species of which are described below. This species group has previously been known only from the Caribbean Slopes of Mexico and Guatemala and on the semi-arid Yucatan Peninsula (Lynch, 1965). The two new species are from localities in the cloud forests on the Pacific versant of Mexico. In the course of investigations on the avifauna of a cloud forest in the Isthmus of Tehuantepec, Mexico, a field party from Louisiana State University Museum of Zoology (LSUMZ) found a specimen of a new species of the alfredi group. The frog is related to E. decoratus Taylor and E. guerreroensis sp. n. (described below). Eleutherodactylus silvicola new species Hohtype: LSUMZ 7557, 12 mi. NNE Zanatepec, Oaxaca, Mexico, 4900 ft elevation; L. C. Binford collector, 9 April 1964. 1 Present address Miaseum of Natural History, University of Kansas, Lawrence. 33— Prog. Biol. Soc. Wash., Vol. 80, 1967 (211)
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