sentences:  The specific name "fuscifacies" is derived from Latin "fuscus" (=tan) and "facies" (=face), in reference to the uniform tan-colored loreal region and the lack of a light subocular spot.Common name Napo slender-legged treefrog has been coined for this species.Male "Osteocephalus fuscifacies" measure and females in snout–vent length.