Predatory insect (S, not D) (6)

(Other definitions for mantis that I've seen before include "A praying . . . . . . is a kind of grasshopper" , "Insect often seen in praying posture" , "Large-eyed insect, looks as if it's praying" , "It appears to be praying but is more likely preying" , "Preying animal, the female of which is deadlier than the male!" .)