Brown Snake
Brown snake has many meaning of it's word, it is the common name given to a number of very different species of snakes:
The genus Pseudonaja, Australian brown snakes
The genus Storeria, North American brown snakes
The species Elapognathus minor, the Australian short-nosed, or little brown, snake
The species Pseudechis australis, the Australian mulga, or king brown, snake
So these species of snakes are include the name of brown snakes.