The Madrean alligator lizard (Elgaria kingii), also known commonly as King's alligator lizard and el lagarto de montaña in Mexican Spanish, is a species of lizard in the familyAnguidae. The species is native to the southwestern United States and adjacent northwestern Mexico.
Baird SF, Girard C (1852). "Characteristics of some New Reptiles in the Museum of the Smithsonian Institution". Proceedings of the Academy of Natural Sciences of Philadelphia6: 125–129. (Elgaria nobilis, new species, p. 129).
Boulenger GA (1885). Catalogue of the Lizards in the British Museum (Natural History). Second Edition. Volume II. ... Anguidæ .... London: Trustees of the British Museum (Natural History). (Taylor and Francis, printers). xiii + 497 pp. + Plates I–XXIV. (Gerrhonotus kingii, pp. 274–275).
Gray JE (1838). Catalogue of the Slender-tongued Saurians, with Descriptions of many new Genera and Species. Annals and Magazine of Natural History, First Series1: 274–283, 388–394. (Elgaria kingii, new species, pp. 390–391).
Smith HM, Brodie ED Jr (1982). Reptiles of North America: A Guide to Field Identification. New York: Golden Press. 240 pp. ISBN0-307-13666-3. ("Elgaria kingi [sic]", pp. 86–87).
Stebbins RC (2003). A Field Guide to Western Reptiles and Amphibians, Third Edition. The Peterson Field Guide Series ®. Boston and New York: Houghton Mifflin. xiii + 533 pp. ISBN978-0-395-98272-3. (Elgaria kingii, pp. 334–335 + Plate 41 + Map 124).
Webb RG (1962). "A New Alligator Lizard (Genus Gerrhonotus) from Western México". Herpetologica18 (2): 73–79. (Gerrhonotus kingi [sic] ferrugineus, new subspecies).