- black rat snake, blacksnake, pilot blacksnake, mountain blacksnake, Elaphe obsoleta - large harmless shiny black North American snake
--1 is a kind of rat snake
--1 is a member of Elaphe, genus Elaphe - blacksnake, black racer, Coluber constrictor - blackish racer of the eastern United States that grows to six feet
--2 is a kind of racer
--2 has particulars: blue racer, Coluber constrictor flaviventris