| Distribution | USA (SE Arizona, New Mexico, SW Texas),
Mexico (NE Sonora, N/E Chihuahua, Coahuila, NE Durango, N Zacatecas, San Luis Potosi, Nuevo Leon, Michoacan [HR 30: 113], Jalisco [HR 32: 59])
Type locality: Fort Buchanan, Arizona.
Map legend:
 - Region according to the TDWG standard, not a precise distribution map.
NOTE: TDWG regions are generated automatically from the text in the distribution field and this does not always work properly. We are working on it.
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| References |
- Boundy, Jeff; Frank T. Burbrink, Jonathan A. Campbell, Brian I. Crother, Kevin de Queiroz, Darrel R. 2012. Standard Common and Current Scientific Names for North American Amphibians, Turtles, Reptiles, and Crocodilians, Seventh Edition. SSAR, 101 pp.
- Chrapliwy, Pete S.;Ward, Arthur J., Jr 1963. New records of the western hook-nosed snake Ficimia cana (Cope), in West Texas Southwestern Naturalist 8 (1): 52-53 - get paper here
- Conant,R. & Collins,J.T. 1991. A Field Guide to Reptiles and Amphibians of Eastern/Central North America, 3rd ed. Houghton Mifflin (Boston/New York), xx + 450 p.
- Cope, E.D. 1860. Catalogue of the Colubridae in the Museum of the Academy of Natural Sciences of Philadelphia, with notes and descriptions of new species. Part II. Proc. Acad. Nat. Sci. Philadelphia 12: 241-266 - get paper here
- Crother, B. I. 2000. Scientific and standard English names of amphibians and reptiles of North America north of Mexico, with comments regarding confidence in our understanding. Herpetogical Circular, No. 29: 1-82
- Degenhardt, William G.; C. W. Painter, and A. H. Price 1996. Amphibians and reptiles of New Mexico. Univ. New Mexico Press, 431 pp.
- Dixon, James R. 2000. Amphibians and reptiles of Texas, second edition. Texas A&M University Press, 421 pp.
- Hardy, L. M. 1976. Possible hybridization between Gyalopion canum and Ficimia publia (Serpentes: Colubridae) American Zoologist 16 (2): 16
- Hardy, Laurence M. 1976. Gyalopion, G. canum, G. quadrangularis. Catalogue of American Amphibians and Reptiles (182): 1-3 - get paper here
- Smith, Hobart M. 1944. Snakes of the Hoogstraal Expeditions to northern Mexico. Zoological Series of Field Museum of Natural History 29 (8): 135-152 - get paper here
- Smith, J. R.;Thornton, Okla W., Jr;Dixon, James R. 1996. Geographic Distribution. Gyalopion canum Herpetological Review 27 (1): 34
- Stebbins,R.C. 1985. A Field Guide to Western Reptiles and Amphibians, 2nd ed. Houghton Mifflin, Boston
- Thornton, Okla W., Jr.;Smith, Jerry R. 1993. New county records of amphibians and reptiles from West-Central Texas Herpetological Review 24 (1): 35-36
- Werning, Heiko 2012. Die Reptilien und Amphibien des Südwestens Draco 13 (50): 18-60 - get paper here
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