Comprehensive DescriptionRead full entry
A small, dull-colored frog, adult males are 17-25 mm long and adult females, 17-35 mm. Brown to gray tan dorsal ground color with usually one or two darker chevrons. Often a narrow middorsal pinstripe or a broad pair of dorsal stripes. Marbled, stippled, or blotched on a dark brown to gray tan ground posterior thigh surface and creamy undersurface. Iris gold above and brownish below (Savage 2002).
Smooth to slightly tuberculate dorsum; head a little broader than long; snout truncate from above; large eyes with eyelids that have many low, rounded tubercles. Distinct tympanum; oblique vomerine odontophores. Distinct, small, rounded finger and toe disks; lacks digital webbing. Many small plantar tubercles; elongate inner metatarsal tubercle larger than conical outer metatarsal tubercle; lacks tarsal fold. Adult males have paired vocal slits and a distensible internal subgular vocal sac strongly granular when uninflated; lacks nuptial thumb pads (Savage 2002).
Thomas Barbour in 1914 named the species after Robert S. Johnstone, Chief Justice of Grenada. Often confused with E. martinicensis (Kaiser 1997).
A Spanish-language species account can be found at the website of Instituto Nacional de Biodiversidad (INBio).