Should we identify traps as a "Common Monster"?

I ran The Mines of Madness earlier this year and decided to make some updates to that entry. One of the key elements of that adventure is the traps, but I'm not sure how to indicate that in the adventure? Is it a common monster? Should it be included in the description? Is there a third option I'm not seeing? Thanks.

EDIT: Also how would Riddles be handled?