The taxonomic status of the flying lizard, Draco cornutus Gunther, 1864, re
cently frequently regarded as a junior synonym of D. volans Linnaeus, 1758,
is reassessed. Our field observations in Borneo confirmed sympatric occurr
ence of two morphotypes of D. volans sensu lato, one of which showed a diag
nostic character of D. cornutus. The two morphotypes also differ from each
other in live coloration, allozyme pattern and mitochondrial DNA sequence.
From these results, it is concluded that D. cornutus is a valid species.