n.黑蛇；虎蛇；皮鞭
North American blacksnake(Elaphe obsoleta) that resembles the black racer. 黑锦蛇：一种北美黑蛇（黑锦蛇），与黑蛇相似
Black racer:a North american blacksnake (Coluber constrictor) commonly found in the eastern United States. 黑脊游蛇:北美产一种黑蛇(黑游蛇),一般于美国东部发现。
North American blacksnake(Coluber constrictor) commonly found in the eastern United States. 黑脊游蛇：北美产一种黑蛇（黑游蛇），一般于美国东部发现
A bluish-green, harmless variety (Coluber constrictor flaviventris) of the blacksnake, found in the central United States. 青色游蛇：青绿色，无毒的黑蛇（黄腹黑游蛇黑蛇属），在美国中部被发现
A bluish-green, harmless variety(Coluber constrictor flaviventris) of the blacksnake, found in the central United States. 青色游蛇：青绿色，无毒的黑蛇（黄腹黑游蛇黑蛇属），在美国中部被发现
