In some specimens the brown blotches on the dorsum of the caudal musculature are fused and marked with cream-colored flecks.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman
Color and Pattern The dorsum in living frogs of the genus Ptychohyla is primarily yellowish or reddish brown, except in P. schmidtorum chamulae and P. ignicolor in which it is green.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman
10th June, 1892, in the dorsum of left foot.
"On Snake-Poison: its Action and its Antidote"
A. Mueller