30 



based on reptilian and mammalian data. Bull. Maryland 



Herpetol. Soc. 16(2): 54-69. 

 Perez-Higareda, Gonzalo and Hobart M. Smith. 1987. A relic 



population of the "bejuguilla verde," Oxybelis fulgidus , in 



southern Veracruz, Mexico (Reptilia: Serpentes). Bull. 



Maryland Herpetol. Soc. 23(2): 56-57. 

 Perez-Santos, Carlos and Ana G. Moreno. 1988. Ofidios de 



Colombia. Monografia 6. Museo Regionale di Scienze 



Naturali; Torino. 

 Perkins, C. B. 1949. A key to the snakes of the United 



States. Bull. Zool. Soc. San Diego 24: 1-79. 

 Peracca, M. G. 1896. Retti ed anfibii raccolti nel Darien ed a 



Panama dol dott. E. Festa. Bol. Mus. Zool. Anat. Comp. 



11(253): 1-11. 

 Peracca, M. G. 1904. Viaggio del Dr. Enrico Festa nell Ecuador 



e regioni vicine. Rettili ed amphibii. Bol. Mus. Zool. 



Anat. Comp. 19(465): 9-15. 

 Perrier, Edmond. 1928. Development embryogenigue des Vertebres 



allantoidiens les Reptiles. Traite de Zoologie 8: 2885- 



3118. 

 Peters, James A. 1954. The amphibians and reptiles of the coast 



and coastal Sierra of Michoacan, Mexico. Occ. Pap. Mus. 



Zool. Univ. Michigan (554): 1-37. 

 Peters, James A. 1960. Notes on the faunistics of southwestern 



and coastal Michoacan with lists of Reptilia and Amphibia 



collected in 1950 and 1951. Pp. 318-333. In: D. D. Brand. 



Coalcoman and Motines del Oro, An Ex Distrito of Michoacan, 



Mexico. Inst, for Latin Amer. Studies; Austin, Texas. 

 Peters, James A. 1960a. The snakes of Ecuador. Bull. Mus. 



Comp. Zool. Harvard College 122(9): 491-541. 

 Peters, James A. 1960b. The snakes of the subfamily Dipsadinae. 



Misc. Publ. Mus. Zool. univ. Michigan (114): 1-224. 

 Peters, James A. and Braulio Orejas-Miranda. 1970. Catalogue of 



the Neotropical Sguamata: Part I. Snakes. Smithsonian 



Inst. Press; Washington. 

 Peters, W. 1859. Uber die von Hrn. Dr. Hoffman in Costa Rica 



gesammelten und an das konigl. zoologische Museum gesandten 



Schlangen. Monats. konig. preuss. Akad. Wissenschaf ten 



Berlin 1859: 275-278. 

 Phelps, Tony. 1981. Poisonous Snakes. Blandford Press; 



Dorset, England. 

 Phisalix, Marie. 1922. Animaux Venimeux et Venins. Masson & 



Cie; Paris. 2 Vols. 

 Picado, T. Clodomiro. 1976. Serpientes Venenosas de Costa Rica. 



Editorial Universidad de Costa Rica; San Jose. 

 Plummer, Michael V. 1981. Habitat utilization , diet and 



movements of a temperate arboreal snake ( Opheodrys 



aestivus ) . J. Herpetol. 15(4): 425-432. 

 Pope, Clifford H. 1955. The Reptile World. A Natural History of 



the Snakes, Lizards, Turtles and Crocodilians. Alfred A. 



Knopf; New York. 

 Pope, Clifford H. 1957. Reptiles Around the World. A Simplified 



Natural History of the Snakes, Lizards, Turtles, and 



Crocodilians. Alfred A. Knopf; New York. 



