Thanks for the replies. I fed the female a cricket and a grasshopper while the mating was going on. The male just disconnect, and the female was not in the least bit interested in going after him! I put him in another cage and will wait 2 days before I mate him with the other female.
This Spring, I bought a few egg cases to put in my gardens, and my 6 year old begged me to let him raise a few of the nymphs. We wound up with the 2 females, but I happened on the male while out gardening - it was fate! Now, of course, I have to discourage him from bringing th "bug porn" photos in to show his classmates!
How long do praying mantises live in captivity? He's going to be sad when these die, but now we should have at least one egg case that I'm sure he'll want to save a few from!