rtinicensis_ Tschudi, 1838

_Diagnosis and definition._--Small to large frogs (12 to 110
mm. snout-vent length) having slightly to widely expanded
digital pads, each pad bearing a terminal transverse groove;
lumbo-inguinal, inguinal, and axillary glands absent, or if
present, diffuse, irregular in outline, not compact; plantar
supernumerary tubercles absent, or if present, six or fewer,
restricted to distal area of plantar surface, and not
extending between metatarsal tubercles; tarsus bearing inner
or outer tubercles or folds or not; toes free to one-half
webbed; terminal phalanges T-shaped; sternum cartilaginous,
lacking bony style; sphenethmoid not truncate anteriorly;
nasals in contact medially; maxillary and quadratojugal in
contact; anterior arm of squamosal not in contact with
maxillary; dermal cranial elements not involved in
integumentary-cranial co-ossification; prevomers large,
dentigerous processes present or not, dentate or not;
maxillary and premaxillary bones dentate; occipital condyles
separated; development direct.

_Composition._--About 420 names have been applied to frogs
of this genus; many of these names are synonyms, and many
other species remain undescribed and unnamed. Perhaps the
genus contains 350 species. Thirty-one species occur in
Mexico and northern Central America.

_Distribution._--From Tamaulipas and Sinaloa, Mexico,
exclusive of the Mexican Plateau, to at least Peru and
southernmost Brazil and throughout the West Indies.
Introduced into Florida.

_Etymology._--Greek (_eleuthero_ + _dactylus_) meaning
free-toed.

Genus ~Engystomops~ Jimenez de la Espada, 1872

_Type species._--_Engystomops petersi_ Jimenez de la Espada,
1872

_Diagnosis and definition._--Small frogs (20 to 40 mm.
snout-vent length) having undilated digital tips lacking
transverse grooves; lumbo-inguinal or inguinal glands
absent; plantar supernumerary tubercles present, extending
between metatarsal tubercles; tarsus bearing spinelike
tubercle on inner edge; toes free; terminal phalanges
pointed; sternum bearing bony style; spenethmoid not
truncate anteriorly; nasals in contact medially; maxillary
and quadratojugal in articular contact; anterior arm of
squamosal not in contact with maxillary; dermal cranial