VENTROLATERAL GLANDS.--Breeding males develop thickened, pigmented glandular areas on the sides of the body. In living specimens of _P. schmidtorum_ and _P. ignicolor_ the glands are not readily visible, but in preservative they show as distinctive orange-colored areas. These glands are most distinct in _P. euthysanota_; in many specimens of this species the glands are elevated above the surrounding skin. The extent of the glands is variable (Fig. 2); probably this variability is due to different degrees of development in individual frogs rather than to interspecific differences. All _Ptychohyla ignicolor_ and some _P. schmidtorum chamulae_ have a small, round glandular area on the chin; to my knowledge this does not occur in the other species. Superficial examination of microscopic preparations of the glands reveals no histological differences between species. The glands occupy most of the thickened area and have narrow ducts leading to the exterior. Detailed studies of the histology will be reported elsewhere. Since the glands are developed only in breeding males, it is surmised that the glands are associated with some phase of the breeding activity. [Illustration: FIG. 2. Normal extent of ventrolateral glands in (A) _Ptychohyla euthysanota euthysanota_ (KU 58008), (B) _Ptychohyla schmidtorum schmidtorum_ (KU 58037), and (C) _Ptychohyla ignicolor_ (UMMZ 119603).] TONGUE.--The shape of the tongue varies intraspecifically. Usually the tongue is ovoid; in some specimens it is barely notched posteriorly, whereas in others it is deeply notched, making the tongue cordiform. Deeply notched cordiform tongues are found in _P. leonhardschultzei_ and _P. schmidtorum_; with the exception of these two species, some individuals of all species have emarginate tongues. Some individuals of all species have tongues that are shallowly notched posteriorly. 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. Usually there are some darker blotches or reticulations on the dorsum. The venter usually is white; in _P. ignicolor_ it is yellow. The venter is spotted in all members of the _Ptychohyla euthysanota_ group; the species, arranged from least to most spotting ventrally, are: _P. euthysanota euthysanota_, _P. euthysanota macrotympanum_, _P. leonhardschultzei_, and _P. spinipollex_. The last two species also have bold dark spots on the flanks. _Ptychohyla schmidtorum_ lacks spots on the venter, whereas _P. ignicolor_ has small dark flecks ventrally.