Could it be that what the bible refers to in Lev. is the things to "go" meaning "fly" on all four (wings, like beetle and crickets do!!? I looked at that and unless I missed something, that seems to be what it means.
" Originally, all winged insects had four separate wings as do all dragonflies today. But more recently, most insects, that have four wings, flap them together and have connected wing surfaces."
http://wings.avkids.com/Book/Animals/ad ... ts-01.html
Leviticus 11:21 Yet these may ye eat of every flying creeping thing that goeth upon all four, which [edit 'also'] have legs above their feet, to leap withal upon the earth; 22 Even these of them ye may eat; the locust after his kind, and the bald locust after his kind, and the beetle after his kind, and the grasshopper after his kind. 23 But all other flying creeping things, which have four feet, shall be an abomination unto you.