183. 
184. 
185s 
186. 
187. 
188. 
189. 
190. 
19. 
192: 
193% 
194, 
16 
Zweifel, R.G. 1954a. A new frog of the genus Rana from western Mexico 
with a key to the Mexican species of the genus. Bull. So. 
California Acad. Sci. 53(3): 131-141. 
Zweifel, R.G. 1954b. Notes on the distribution of some reptiles in 
western Mexico. Herpetologica 10(3): 145-149. 
Zweifel, R.G. 1955. Ecology, distribution, and systematics of frogs of 
the Rana boylei group. Univ. California Pub. Zool. 54(4): 207-292. 
Zweifel, R.G. 1956. A survey of the frogs of the augusti group, genus 
Eleutherodactylus. Amer. Mus. Novitates (1813) 1-35. 
Zweifel, R.G. 1959. Variation in and distribution of lizards of 
western Mexico related to Cnemidophorus sacki. Bull. Amer. Mus. 
Natu cHist.. 117 (2) = "570 lo. 
Zweifel, R.G. 1968. Rana tarahumarae. Cat. Amer. Amph. Rept. 66.1- 
66.2. 
ADDENDUM 
Guillette, L.J., Jr., and G. Casas-Andreu. 1987. The reproductive 
biology of the high elevation Mexican lizard Barisia imbricata. 
Herpetologica 43(1): 29-38. 
Jones, T.R., J.P. Collins, T.D. Kocher, and J.B. Mitton. 1988. 
Systematic status and distribution of Ambystoma tigrinum stebbinsi 
(Amphibia: Caudata). Copeia 1988(3): 621-635. 
Price, A.H., and B.K. Sullivan. 1988. Bufo microscaphus. Cat. Amer. 
Amph. Rept. 415.1-415.3. 
Restrepo T., J.H., and J.W. Wright. 1987. A new species of the 
Colubrid snake genus Geophis from Colombia. J. Herpetol. 21(3): 
191-196. 
Stille, B. 1987. Dorsal scale microdermatoglyphics and rattlesnake 
(Crotalus and Sistrurus) phylogeny (Reptilia: Viperidae: 
Crotalinae). Herpetologica 43(1): 98-104. 
Tanner, W.W. 1987. Lizards and turtles of western Chihuahua. Great 
Basin Naturalist 47(3): 383-421. 
