1960. The snakes of the subfamily Dipsadinae. Misc. Pubis. Mus. Zool., Univ. Michigan, No. 114:1-224.
1964. Dictionary of herpetology. Hafner Publ. Co., New York, 392 pp.
Schmidt, K. P. and Davis, D. D.
1941. Field book of snakes. G. P. Putnam's Sons, New York, 365 pp.
Smith, H. M. and Sanders, O.
1952. Distributional data on Texan amphibians and reptiles. Texas J. Sci., 4(2):204-219.
Taylor, E. H.
1936. Notes and comments on certain American and Mexican snakes of the genus Tantilla, with descriptions of new species. Trans. Kansas Acad. Sci., 39:335-348.
Wright, A. H. and Wright, A. A.
1957. Handbook of snakes. Comstock Publ. Assoc, Cornell, Vol. II, pp. 565-1105.
Department of Biology, The University of New Mexico, Albuquerque, 87106, and Department of Zoology, The University of Arizona, Tucson, 85721.