AD&D's Monster Manual II was the first place you could find yourself face to face with one of these reptilian horrors, and for some reason, I have been thinking about how to place them in one of my games (not got any plans to use them yet though). So, I thought I would share the stats I did for it with you all. Enjoy!
This is the original art from AD&D Monster Manual II (it's on page 19).
Here be the stats!
(Add +4 to all ability modifiers shown to get the right value...click to enlarge)