Adult: Species description based on Savage (2002). Medium-sized frog. Males to 37 mm, females to 54 mm. Dorsal: Dorsal coloration ranges from light to dark brown. A thin middorsal line and some dark spotting or blotches between the shoulder blades, along the vertebrae, and just above the rear are usually present. The dorsal surface is mostly smooth, except for a few tubercules near the base of the head. Arms and legs are barred. Ventral: The ventral surface is white, with little if any mottling. Concealed surfaces: The rear surface of the thigh is rusty red-brown. Distinguishing characteristics: A dark eye mask that often extends just beyond and above the armpit is usually present. Eye: Upper portion of iris red, lower portion brown. Extremities: Feet are not extensively webbed.
Habitat: Lowland and premontane forest to about 1500 m. Ecology: This species is dinurnal and is commonly encountered in leaf litter (Savage 2002). Type locality: Veragua (Panama) Diet: The diet consists of small arthropods (Toft 1981).
Diagnostic description: Their paws are tiny webs between the fingers lll and lV extending at most slightly beyond the first subarticular tubercle of each toe. The dorsal skin is smooth or with a few warts and folds, or cords, but never tuberculate.
The tip of the fingers (especially fingers III and IV) has clearly enlarged discs or bearings without cranial crests. The head is narrow and measures 30 to 43% of standard length. The bearings of the two outer fingers (III and IV) are the same or only slightly higher than those of the fingers and II. The bearing outer finger and paw usually are not truncated or emarginate. The heel has a tuber (trace) defined. Lanceolate bearings presented in some fingers and legs.
They usually have a dark mask extending from the snout to the eardrum, and there continues inferiorly and posteriorly to the body, at least as a narrow stripe, beyond the armpit. The posterior surface of the thigh is brown uniform.
Adult males lack nuptial pads and vocal slits thumbs. The maximum standard length of adult males is 32 mm. and females is 45 mm.
Habitat: They live in primary forest mulch.
Reproduction: Eggs laid on the floor have direct development. Males lack vocal sac and has not been observed to sing. It is unknown how the sexes are.
Behavior: They are predominantly diurnal.
Distribution in Costa Rica: In the lowlands and the middle Atlantic slope, between 10 and 1,520 m. Lift (Savage 2002).
Distribution outside Costa Rica: Found in Costa Rica and Panama.