Oh no. I know they're from egg cases I bought earlier last spring from amazon.com, I had plans to see if I could raise them up to adult size as captives. That didn't work out so well, but when the egg cases hatched there were so many of them that I put most of them outside and spread around in our various gardens where my wife wanted them for pest control. We've been seeing them around here and there all year. My wife particularly gets a kick out of seeing them and every time she came across one in her gardens she'd take a picture of it and send it to me. I was just surprised to see one inside on my window sill and was especially surprised to find an egg case.