A couple of years ago I bought two T.Sinensis oothes from a local nursery supply here in Southern Ontario, Canada. I placed them outside, I saw the nymphs hatch but never saw any full grown mantises. There must have been about two hundred or more nymphs. Southern Ontario and British Columbia are the only places in Canda where mantises can survive. There are only two species in Southern Ontario- Tenodera sinensis and Mantis religiosa, and they not really native but were brought in decades ago for pest control. British Columbia has a small ground mantis whose name escapes me at the moment but it probably wasn't native to B.C. but came up from the US.