_P. euthysanota_ (Pl. 11B).--One long note is repeated six to nine times at intervals of 2.7 to 3.4 seconds and has an average dominant frequency of 3070 cycles per second. _P. leonhardschultzei_ (Pl. 11C).--One long note is repeated once after 10 to 13 seconds and has an average dominant frequency of 2750 cycles per second. _P. schmidtorum_ (Pl. 11D).--The complete call consists of one short series of notes alternating with two long series. Numbers of notes per series in one individual having a typical call were 5-8-8-3-9-9. The average dominant frequency of notes in the short and long series alike is 3400 cycles per second. _P. ignicolor_ (Pl. 11E).--The complete call consists of a short series of notes alternating with a long series. In one complete recording the numbers of notes in these series were 4-13-3-11. The notes in the short series have an average dominant frequency of 2100 cycles per second, whereas the notes in the long series have an average dominant frequency of 3150 cycles per second. The four series of notes were given in one minute and 15 seconds. SYSTEMATIC ACCOUNTS The museum catalogue numbers of the specimens examined, together with the localities from which they came, are listed at the end of the account of each subspecies or monotypic species. The localities that are represented by symbols on the distribution map (Fig. 7) are in roman type; those that are not represented on the map, because overlapping of symbols would have occurred, are in italic type. =Ptychohyla= Taylor, 1944 _Ptychohyla_ Taylor, Univ. Kansas Sci. Bull., 30:41, May 15, 1944. Type, _Ptychohyla adipoventris_ Taylor, 1944 [= _Hyla leonhardschultzei_ (Ahl), 1934]. _Diagnosis._--Small hylids having stream-adapted tadpoles and differing from other hylid genera in having large ventrolateral glands in breeding males. _Composition._--Five species, two of which are made up of two subspecies, arranged in two groups of species on the basis of morphological characters of adults and tadpoles and on the basis of breeding calls. _Distribution._--Moderate elevations from southern Guerrero and northern Oaxaca, Mexico, to northern El Salvador and central Honduras. KEY TO ADULTS 1. A weak tarsal fold; outer fingers one-third webbed; males having spiny nuptial tuberosities; color in life tan or brown with blotches or reticulations, never green; iris bronze color _P. euthysanota_ group--2 No tarsal fold; outer fingers having only vestige of web; males lacking nuptial tuberosities; color in life green or brown; iris red or golden color _P. schmidtorum_ group--5 2. Chest, throat, and flanks usually having brown or black spots; no distinct white stripe on upper lip or on flanks; a faint white line usually present above anal opening; a rostral keel 3