55 
aggregation of frogs, with notes on the ecology of 
Aaalvchnis spurrelli (Anura: Hylidae). Bull. S. Calif. 
Acad. Sci. 73:86-94. 
Scott, N.J. J.M. Savage, and D.C. Robinson. 1983. Checklist 
of reptiles and amphibians (of Costa Rica). Pp 367-374. 
In Janzen, D.H. ed. Costa Rican Natural History. Univ. 
Chicago Press. 816 p. 
Seidel, M.E. and H.M. Smith. 1986. Chrvsemvs . Pseudemvs . 
Trachemvs (Testudines: Emydidae): did Agassiz have it right? 
Herpetologica 42:238-244. 
Sexton, O.J. and H. Heatwole. 1965. Life history notes on some 
Panamanian snakes. Carib. J. Sci. 5:39-43. 
Sexton, O.J., H. Heatwole, and D. Knight. 1964. Correlation 
of microdistribution of some Panamanian reptiles and 
amphibians with structural organization of the habitat. 
Carib. J. Sci. 4(1):261-295. 
Sexton, O.J., H. Heatwole, and E. Meseth. 1963. Seasonal 
population changes in the lizard Anolis limifrons in Panama. 
Amer. Midi. Nat. 69:482-491. 
Shreve, B. 1935. On a new tocid and amphibia from Panama, 
Ecuador, and Paraguay. Occ. Pap. Boston Soc. Nat. Hist. 
8:209-218. 
Silverstone, P.A. 1975. A revision of the poison-arrow frogs 
of the Genus Dendrobates Wagler. Nat. Hist. Mus. Los 
Angeles Co. Sci. Bull. 21:1-55. 
Silverstone, P.A. 1976. A revision of the poison-arrow frogs 
of the Genus Phvllobates Bibron in Sagra (Family 
Dendrobatidae). Nat. Hist. Mus. Los Angeles Co. Sci. 
Bull. 27:1-53. 
Slevin, J.R. 1942. Notes on a collection of reptiles from 
Boquete, Panama, with the description of a new species 
of Hvdromorphus . Proc. Calif. Acad. Sci. (4.Ser.)23:463-480. 
Solis, F.A. 1991. Clelia scvtalina . Herpetol. Rev. 22(4):135. 
Smith, H.M. 1939. The Mexican and Central American lizards of 
the Genus Sceloporus . Field Mus. Nat. Hist., Zool. Ser. 26: 
1-397. 
Smith, H.M. 1958. Handlist of the snakes of Panama. Herpetologica 
14 (3):222-224. 
Smith, H.M. 1987. Current nomenclature for the names and material 
cited in Gunther's Reptilia and Batrachia volume of the 
Biologia Centrali-Americana. Pp. xxiii-li. In: 1987 reprint 
ed. Soc. Stud. Amphib. Rept. Facs. Rep. Herp. 575 p. 
Smith, H.M. and C.B. Bumzaham. 1955. The identity of the 
trans-isthmic populations of the Malachite tree-lizard 
( Sceloporus malachiticus Cope). Herpetologica 11(2):118-120. 
Smith, H.M., K. Fitzgerald, G. Perez-Hilgareda, and D. Chizar. 
1986. A taxonomic rearrangement of the snakes of the Genus 
Scaphiodontophis . Bull. Maryland Herpetol. Soc. 22:159-166. 
Smith, H.M. and C. Grant. 1958. New and noteworthy snakes from 
Panama. Herpetologica 14(3):207-215. 
Smith, H.M. and C. Grant. 1961. The Mourning gecko in the 
Americas. Herpetologica 17(1):68. 
Smith, H.M., K.L. Williams, and G. Perez-Hilgareda. 1986. The 
