Hello Bob:
We're glad you found this forum. There is probably more info on Mountain Horned Dragons here than any other site. This complex group of lizards is a real enigma because there are new species cropping up as new areas are opened. A good diagnostic key is in order for them. I'm sure that in the scientific literature there is one but I do not have a copy myself. I was at a show the other day and found a table that had several "Mountain Horned Dragons." There were at least three species of them. I picked up a nice unidentified male from the group.
This group of lizards includes the bizarre Angle-Head Dragons of the genus Gonocephalus. There are some extremely interesting lizards in that group as well.
As a whole Asian Forest "Dragons" are extremely interesting and raising the eyebrows of researchers. Stay tuned here as many of the hobbyists who work with this group of lizards talk here.
Have a Great Day!!!
P.S. Check out the archives and the old archives for pictures of various species.