tion to past and present environments. Pages 

 433-468 in Hubbs, C. L., ed. Zoogeography. 

 Am. Assoc. Adv. Sci. Publ. 51. 



. 1959. Genetic conpatibility and species 



groups in U.S. toads (Bufo). Texas J. Sci. 

 427-453, 



1963. Intragroup genetic compatibility 



in the Bufo americanus species group of toads. 

 Texas J. Sci. 15:15-34. 



. 1965. Amphibian speciation. Pages 543- 



556 in Wright, H. E. and D. G. Frey, eds. The 

 Quartemary of the United States. Princeton 

 Univ. Press, Princeton. 



. ed. 1972. Evolution in the genus Bufo. 



Univ. Texas Press, Austin. 



Bragg, A. N. 1960. Feeding in the Houston toad. 

 Southwest Natur. 5:160. 



Brown, L. E. 1967. The significance of natural 

 hybridization in certain aspects of the specia- 

 tion of some North American toads (genus 

 Bufo). Ph. D. Dissert. Univ. Texas, Austin. 



. 1971. Natural hybridization and trend 



toward extinction in some relict Texas toad 

 populations. Southwest Natur. 16:185-199. 



. 1973. Bufo houstonensis Sanders. Cat. 



Am. Amphib. Rep. 133.1-1-133.2.' 



. 1975. The status of the near-extinct 



Houston toad (Bufo houstonensis) with 

 recommendations for its conservation. Herp. 

 Rev. 6:37-38. 



Ehrenfeld, D. W. 1976. The conservation of non- 

 resources. Am. Sci. 64:648-656. 



Guttman, S. 1. 1969. Blood protein variation in 

 the Bufo americanus species group of toads. 

 Copeia 1969:243-249. 



Hardy, M. 1977. Froggie goes to court. Texas 

 Monthly 5:76. 



Kennedy, J. P. 1962. Spawning season and experi- 

 mental hybridization of the Houston toad, 

 Bufo houstonensis. Wer^etolo^ca. 17:239-245. 



Sanders, O. 1953. A new species of toad with a 

 discussion of the bufonid skull. Herpetologica 

 9:25-47. 



Thomas, R. A. 1975. Investigation on the status 

 of the Houston toad, Bufo houstonensis 

 Sanders. Unpubl. Final Rep. to the U.S. Fish 

 Wildl. Serv. Contract 14-16-0002-3557. 



Contains complete bibliography for the species through 

 1973. 



• 1975. (Cover photo: Bufo houstonensis). 



Herp. Rev. 6(2). 



Thomas, R. A., and F. E. Potter, Jr. 1975. Species 

 status account: Bufo houstonensis Sanders. 

 Texas Parks Wildl. Dep. Job Perform. Rep. 

 70:1-11. 



GATEKEEPER 



To be designated by Office of Endangered 

 Species. 



ACCOUNT PREPARED/UPDATED BY: 



Louisiana Nature Center 

 4100 One Shell Square 

 New Orleans, LA 70129 



and 



National Fish and Wildlife Laboratory 

 412 N.E. 16th Avenue, Room 250 

 Gainesville, FL 32601 



