[Illustration: FIG. 2. Palmar views of the hands and lateral views of the tip of the third digits of _Eleutherodactylus alfredi_ (left, KU 93994, x 5) and _Hylactophryne augusti_ (right, KU 102594, x 3).] Supernumerary tubercles rarely are present on the feet of _Eleutherodactylus_, but are present and numerous in every species of _Syrrhophus_, _Tomodactylus_, and in the members of the _augusti_ group of _Eleutherodactylus_ (Fig. 3). The tubercles are small and numerous in _Syrrhophus_ and larger in _Tomodactylus_ and the _Eleutherodactylus augusti_ group. Most species of _Eleutherodactylus_ have no plantar supernumerary tubercles; a few species have such tubercles, which never extend between the metatarsal tubercles as in _Syrrhophus_ and _Tomodactylus_. [Illustration: FIG. 3. Plantar views of feet of _Eleutherodactylus alfredi_ (left, KU 93994, x 4.5), _Syrrhophus pipilans nebulosus_ (middle, KU 58900, x 7.5), and _Hylactophryne augusti_ (right, KU 102594, x 3) showing differences in size and arrangement of supernumerary tubercles.] Tarsal folds and tubercles are lacking in _Syrrhophus_, _Tomodactylus_, and the _augusti_ group of _Eleutherodactylus_. Several species of _Eleutherodactylus_ lack tarsal folds and tubercles, but in nearly every species group, one or more species possess either an inner tarsal fold, inner tarsal tubercle(s), or outer tarsal tubercles. The terminal phalanges of _Syrrhophus_, _Tomodactylus_, and all _Eleutherodactylus_ (except the frogs of the _augusti_ group) are distinctly T-shaped. In the latter, the bones are knob-shaped distally (Fig. 4). T-shaped terminal phalanges also are present in _Lithodytes_ and _Trachyphrynus_ but not in other leptodactylid genera. At least one species of _Eupsophus_ (_E. quixensis_) has terminal phalanges that resemble those of the _Eleutherodactylus augusti_ group. Several species of _Eleutherodactylus_, _Syrrhophus_, and _Tomodactylus_ with slender fingers have T-shaped terminal phalanges although the terminal dilations proportionately are only scarcely wider than the finger tips in the _Eleutherodactylus augusti_ group. The presence of a terminal groove at the tip of the finger is an external indicator of the T-shaped terminal phalanges. [Illustration: FIG. 4. Terminal phalanges of four leptodactylid frogs (all x 13.5). (a) _Eleutherodactylus mexicanus_, KU 55593; (b) _Eupsophus roseus_, KU 84731; (c) _Eupsophus quixensis_, UIMNH 59643; and (d) _Hylactophryne augusti_, KU 56192.] Skull