I have had a lot of experience with these in the past, and while this may seem a little awkward, if you rile up your lizards individually, and get them upset and pick them up, if they get upset, the males will extend their hemi-penis I have sexed alligator lizards upon capture this way when they are wild and upset. You may be able to get them to do this and probably be able to sex them, instead of guessing the jaw. Just a thought.
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