32 



collected material. Zool. Mededel . 51: 265-275. 

 . 1979. The herpetofauna of the Guianan Region. Pp. 241-279. In 



W.E. Duellman (ed.), The South American Herpetofauna. Its 



Origin, Evolution and Dispersal. Univ. Kansas Mus. Nat. Hist. 



Monog. 7. 

 , and U. Gruber. 1983. Spix and Wagler type specimens of 



reptiles and amphibians in the Natural History Museum in Munich 



(Germany) and Leiden (The Netherlands). Spixiana, Suppl . 9: 



319-415. 

 Horton, D. R. 1973. A new species of Mabuya (Lacertilia, 



Scincidae) from Venezuela. J. Herpetol. 7(2): 75-77. 

 Huang, C. C. , and H. F. Clark. 1969. Chromosome studies of the 



cultured cells of two species of side-necked turtles 



( Podocnemis unif ilis and P_;_ expansa ) . Chromosoma (Berlin) 26: 



245-253. 

 , H. F. Clark, and C. Gans. 1967. Karyological studies of 



fifteen forms of amphisbaenians (Amphisbenia-Reptilia) . 



Chromosoma (Berlin) 22: 1-15. 

 Huey, R. B. , and J. R. Dixon. 1970. A new Pseudoqonatodes from 



Peru with remarks on other species of the genus. Copeia, 1970: 



538-542. 

 , and J.R. Dixon. 1977. A new species of Bachia (Teiidae: 



Sauria) from Estado Bolivar, Venezuela, with notes on the 



zoogeography of the genus. Zool. Mededel. 51: 25-31. 

 , and S. J. Gorzula. 1979. Checklist of the savanna 



inhabiting frogs of the El Manteco region with notes on their 



ecology and the description of a new species of tree frog 



(Hylidae, Anura) . Zool. Mededel. 54: 183-216. 

 , and J. Lescure. 1984. A new genus and two new species of 



minute leptodactylid frogs from northern South America, with 



comments upon Phyzelaphryne (Amphibia: Anura: Leptodactylidae) . 



Zool. Mededel. 58: 85-115. 

 Hutchison, J. H. , and D.M. Bramble. 1981. Homology of the 



plastral scales of the Kinosternidae and related turtles. 



Herpetologica 37: 73-85. 



International Union for Conservation of Nature (IUCN) . 1973. 



Crocodiles. Proc. II Working Specialists. IUCN Pub. New Ser. 



Suppl. 41 pp. 

 Iverson, J. B. , and S. A. Iverson. 1980. A bibliography to the 



mud and musk turtle family Kinosternidae. Smithsonian 



Herpetol. Info. Serv. (48): 1-72. 



Johnson, J. D. 1977. The taxonomy and distribution of the 

 neotropical whipsnake Masticophis mentovarius (Reptilia, 

 Serpentes, Colubridae) . J. Herpetol. 11(3): 287-309. 



, and J. R. Dixon. 1984. Taxonomic status of the Venezuelan 



Macagua, Bothrops colombiensis . J. Herpetol. 18: 329-332. 



Keiser, E. A. 1974. A systematic study of the neotropical vine 



snake Oxybelis aeneus (Wagler). Bull. Texas Mem. Mus. 22: 1-51. 



. 1975. Observations on tongue extension of vine snakes (genus 



Oxybelis ) with suggested behavioral hypotheses. Herpetologica 

 31: 131-133. 



