Hyla meridionalis usually grows to 50 mm, with females up to 65mm in length. Slender, long-legged tree frog, with smooth skin. The head is broader than long. Adhesive discs on all digits, with those on the fingers being larger than on the toes. The back is mostly green, but a yellowish, gray, brown or spotted coloration also occurs. Color change is physiological. The venter is whitish. A dark stripe is present from the nostril across the eye and tympanum to the shoulder. The iris is brownish golden, the pupils are horizontal. The tympanum is clearly visible and about half the diameter of the eye. Males posses a vocal sac which can be inflated to a size half the snout-vent length. At rest, the vocal sac is longitudinally folded and yellow to brownish in color. The throat of females is somewhat lighter than the venter. Taken from Noellert and Noellert (1992) and Bons and Beniez (1996).