The list of type specimens presented here includes all holotypes and paratypes that are known in the museum as of April 15, 1962. Only specimens actually designated as paratypes by the original describer are considered as such. Each species or subspecies is listed in the combination as it was originally proposed. If the name has been subjected to subsequent nomenclatural change or has been placed in synonymy, the name in current use is given after an equals sign, together with a citation to the authority for the change. The arrangement in the following list is alphabetical by genus and species within orders (suborders in the Squamata). Current combinations of names that have been changed subsequent to their original proposal are listed in the correct alphabetical place with a cross-reference to the original combination. All original citations have been checked, and actual dates of publication are given for each. The checking of original citations, museum catalogues, labels, and sometimes collectors’ field catalogues has revealed numerous errors. In some cases the catalogue numbers of the holotypes and paratypes given by Taylor actually were his field numbers. In the following list the museum numbers that were subsequently assigned are given. Certain localities have been given incorrectly; for example, Taylor described several species from Moravia de Chirripó, which he gave as being in Limón Province, Costa Rica. Actually Moravia de Chirripó is in Cartago Province. We have attempted to correct all such errors. The holotype and two paratypes of _Rana taylori_ Smith are stated to be in the Museum of Natural History. Smith (Herpetologica, 15:214, December 8, 1959) proposed the name _Rana taylori_ for three specimens discussed by Taylor (Univ. Kansas Sci. Bull., 35:906, July 1, 1952), who gave the numbers 2976-2978. Number 2978 was designated the holotype of _Rana taylori_ by Smith, who never saw the frogs. The numbers 2976-2978 are E. H. Taylor’s field numbers; the specimens never have been catalogued in the Museum of Natural History, and their present location is unknown. The 125 species and subspecies represented by holotypes and paratypes in the collection are distributed among the orders of amphibians and reptiles as follows: AMPHIBIA Gymnophiona (Caecilians) 3 Caudata (Salamanders) 20 Salientia (Frogs and Toads) 39 REPTILIA Testudines (Turtles) 5 Sauria (Lizards) 31 Serpentes (Snakes) 27 GYMNOPHIONA ~_Dermophis costaricense_~ Taylor, Univ. Kansas Sci. Bull., 37:506, fig. 2, October 15, 1955. HOLOTYPE.--No. 36343, Cinchona, Alajuela Province, Costa Rica; Edward H. Taylor; July 14, 1954.