40 
Latin America. Comstock Publ. Assoc./Cornell Univ. Press. 
Ithaca, New York. 425 p. 
Campbell, J.A. and E.N. Smith. 1992. A new frog of the Genus 
Ptvchohvla (Hylidae) from the Sierra de Santa Cruz, 
Guatemala, and description of a new genus of Middle 
American stream-breeding treefrogs. Herpetologica 
48(2):153-167. 
Campbell, J.A. and J.P. Vannini. 1989. Distribution of 
amphibians and reptiles in Guatemala and Belize. Western 
Foundation of Vert. Zool. 4(1):1-21. 
Cannatella, D.C. and W.E. Duellman. 1984. Leptodactylid frogs of 
the Phvsalaemus pustulosus group. Copeia 1984(4):902-921. 
Cochran, D.M. and C.J. Goin. 1970. Frogs of Colombia. U.S. Natl. 
Mus. Bull. 288:1-655. 
Cooper, R.S. 1944. Pattern and color variation in Canal Zone 
salientia. Copeia 1944(2):121-122. 
Cope, E.D. 1875. On the batrachia and reptilia of Costa Rica 
with notes on the herpetology and ichthyology of Nicaragua 
and Peru. Reprint of the 1875 edition; 1967. Departamento de 
Publicaciones de la Universidad de Costa Rica. San Jose, 
Costa Rica. 70 p. 
Daly, J.W. and C.W. Myers. 1967. Toxicity of Panamanian Poison 
Frogs ( Dendrobates ): Some biological and chemical aspects. 
Science 156(3777):970-973. 
Dixon, J.R. 1964. The systematics and distribution of lizards of 
the genus Phvllodactvlus in North and Central America. New 
Mexico State Univ. Sci. Bull. 64:1-139. 
Dixon, J.R. 1970. Coleonvx Gray. Cat. Amer. Amphib. Rept. 95.1-2. 
Dixon, J.R. 1973. A systematic review of the teid lizards. Genus 
Bachia, with remarks on Heterodactvlus and Anotosaura . 
Univ. Kansas Mus. Nat. Hist. Misc. Publ. 57:1-47. 
Dixon, J.R. 1979. Origin and distribution of reptiles in 
lowland tropical rainforests of South America. Pp. 217- 
240. In: W.E. Duellman (ed). The South American 
Herpetofauna: Its origin, evolution, and dispersal. 
Univ. Kansas Mus. Nat. Hist. Monogr. 7:1-485. 
Dixon, J.R. 1980. The neotropical colubrid snake genus Lioohis . 
The generic concept. Milwaukee Publ. Mus. Contrib. Biol. 
Geol. 31:1-40. 
Dixon, J.R. 1983. The Central and South American Anomalepid 
snakes of the Genus Liotyphlops . Amphibia-Reptilia 4:241- 
264 . 
Dixon, J.R. 1983. Systematics of the Latin American snake, 
Liophis epinephalus (Serpentes: Colubridae). Pp. 132-149. 
In : Rhodin, A.G.J. and K. Miyata, (eds.) Advances in 
Herpetology and Evolutionary Biology. Essays in honor of 
Ernest E. Williams. Mus. Comp. Zool. Cambridge, Mass. 725 p. 
Dixon, J.R. 1984. The Central and South American anomalepid 
snakes of the Genus Liotyphlops . Amphibia-Reptilia 4: 
241-264. 
Dixon, J.R. 1989. A key and checklist to the neotropical snake 
Genus Liophis with country lists and maps. Smiths. 
Herpetol. Info. Serv. 79:1-40. 
