By HOBART M. SMITH The chief characters distinguishing Thamnophis radix (Baird and Girard) and T. marciana (Baird and Girard) in southern Kansas are: Typical specimens of radix are available from several localities in Morton County of southwestern Kansas (Spring Creek; twelve miles and eighteen miles north of Elkhart; Elkhart); from the State Lake and Meade in Meade County; from Hunters, Harper County; Coolidge, Hamilton County; and Ingalls, Gray County. Typical marciana is available from Spring