1- As with most insects, the mantis often represents something devious within our lives, that trickster part of us that can create problems when things arc effectively working out for us. It is that aspect of our personality which perhaps preys on the other parts and will not take its place within our overall integration.
2- In dreams, we often translate a quality or a situation we are struggling with into an object.
To be aware of the mantis may indicate that on some level we are aware of trickery around us.
3- The dreamer should look carefully at the appearance of a mantis as it represents deviousness, particularly of an emotional kind.... Ten Thousand Dream Dictionary
This unusual insect’s appearance may mention that it is time to start praying for something. As the female of the species viciously devours her mate, a praying mantis appeanng in a dream may signify an aggressive female whose intention is to kill a man’s ego.... Ariadne's Book of Dream