Entymology.—Greek (leptos + dactylus) meaning slender toes.
Genus Syrrhophus Cope, 1878
Type-species.—Syrrhophus marnockii Cope, 1878
Diagnosis and definition.—Small to medium sized frogs (18 to 40 mm. snout-vent) having slight to prominent digital expansions with transverse groove at tip of each digit; lumbo-inguinal and inguinal gland flattened, irregular in outline, not compact and oval; axillary glands present or not; plantar supernumerary tubercles numerous, more than eight, usually extending between metatarsal tubercles; tarsus lacking tubercles or folds; toes free or basally webbed; terminal phalanges T-shaped; sternum cartilaginous, lacking bony style; sphenethmoid not truncate anteriorly; nasals in contact medially; maxillary and quadratojugal in articular contact; anterior arm of squamosal not in contact with maxillary; dermal cranial elements not involved in integumentary-cranial co-ossification; prevomers large, usually lacking dentigerous processes and teeth; maxillary and premaxillary bones dentate; occipital condyles separated; development direct.
Composition.—Thirteen species; the species described as, or later referred to, Syrrhophus from Lower Central America and South America are Eleutherodactylus or Eupsophus.
Distribution.—Low to moderate elevations from Sinaloa, México, to Guatemala on the Pacific versant; from the Edwards and Stockton plateaus of Texas to British Honduras on the Caribbean versant.
Etymology.—Greek, emendation of syrrhaptos, meaning sewn together in reference to the united outer metatarsals.
Genus Tomodactylus Günther, 1900
Type-species.—Tomodactylus amulae Günther, 1900.