Lystrophis

Lystrophis is the genus of tricolored South American hognose snakes. They mimic milk snakes or coral snakes with their red, black, and white ringed patterns.

Species
The genus Lystrophis contains five species that are recognized as being valid.
 * Lystrophis dorbignyi (A.M.C. Duméril, Bibron & A.H.A. Duméril, 1854) – southern Brazil and southern Paraguay to Argentina
 * Lystrophis histricus (Jan, 1863) – southern Brazil, Paraguay, and Uruguay to northeastern Argentina
 * Lystrophis nattereri (Steindachner, 1867) – southern Brazil
 * Lystrophis pulcher (Jan, 1863) – southern South America, parts of Brazil, Argentina, Paraguay and Bolivia
 * Lystrophis semicinctus (A.M.C. Duméril, Bibron & A.H.A. Duméril, 1854) – central Argentina to southern Bolivia and southwestern Brazil

Lystrophis dorbignyi is the type species for the genus Lystrophis.

Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Lystrophis.

Taxonomy
All species of Lystrophis are sometimes included in the genus Xenodon.