They were introduced to this continent in the late 1890's. They have voracious appetites for garden insects and are extremely beneficial to have around. Females need a lot of energy to make eggs and will eat any insect they can catch. This often means beetles and aphids that usually destroy flowers are removed from the area, sparing the plants. The Chinese Mantis is so welcome in gardens that their eggs are often purchased in garden stores and online so that they are ready to hunt when summer rolls around.
Females are larger than males. They have been known to eat the male after reproducing. Eggs are laid along the bottom of twigs and branches. They look like flat disks, or pumpkin seeds (pepitas).
While any Praying Mantis is a treat to observe, it is best to leave it in its natural habitat where it can hunt all day long. Attempts to keep mantises as 'pets' results in starving them to death because humans cannot possibly feed it as often as it would need. Mantises do not 'look' hungry, but they always are.