He (1963a) cited the ventrolateral glands in breeding males as diagnostic of Ptychohyla.
A narrow, sometimes broken white line is present on the ventrolateral edge of the forearm.
ventrolateral glands noticeably thickened, extending from axilla nearly to groin and only narrowly separated medially on chest.
The ventrolateral glands are less extensive and the chin less spotted than in the holotype.
ventrolateral glands well developed, not reaching axilla or groin and broadly separated midventrally.
There are no ventrolateral glands, glandular area on the chin, or enlarged prepollex.
The ventrolateral glands in schmidtorum more closely approximate one another midventrally than in chamulae.
All of the specimens from southern El Petn have yellow or yellowish white flanks and ventrolateral surfaces.
A small nasal process also extends anteriorly from the ventrolateral surface of the prefrontal.
In an articulated skull the trans-palatine articulates with the ventrolateral articulating surface of the postfrontal.
