_Comparisons._--_Ptychohyla spinipollex_ differs from all other species in the genus by having moderate-sized, instead of small, pointed nuptial spines; also it has fewer spines than the other species (see discussion of this character in Analysis of Data). The nearly equal interorbital breadth and width of the upper eyelid also is diagnostic of this species. Other hylids sympatric with _Ptychohyla spinipollex_ include three species of _Plectrohyla_, each of which has a bony prepollex, heavy body, and rugose skin on the dorsum. The only other sympatric hylid that could be confused with _Ptychohyla spinipollex_ is _Hyla bromeliacea_, which has a round snout and yellowish tan dorsum not marked with dark brown. _Life History._--At Finca Los Alpes, Guatemala, in July, 1960, and in August, 1961, calling males were found on bushes and trees along cascading mountain streams. The breeding call consists of a soft "wraack," repeated at intervals of 45 seconds to four minutes. Each note has a duration of about .46 of a second and a rate of 147 pulses per second. The dominant frequency is 4300 cycles per second (Pl. 11A). Tadpoles have been found in cascading mountain streams. Two metamorphosed young have snout-vent lengths of 15.0 and 15.5 mm. _Remarks._--There is little doubt that all of the specimens herein referred to _Ptychohyla spinipollex_ are conspecific. However, the three specimens from Honduras, including the type of _Ptychohyla spinipollex_, differ from Guatemalan specimens in lacking all dark spotting on the venter. Additional specimens from Honduras and eastern Guatemala may show that two subspecies are recognizable, in which case the nominal subspecies will be the population in Honduras. _Distribution._--This species lives in cloud forests at elevations of 800 to 1700 meters on the Atlantic side of the Guatemalan Highlands from the Sierra de Cuchumatanes in western Guatemala eastward to central Honduras. _Specimens examined._--GUATEMALA: _Alta Verapaz_: Finca Chichen, UMMZ 90876 (tadpoles); Finca Los Alpes, KU 58052-60, 59939 (skeleton), 60053 (tadpoles), 64122-41, 68562, 68563 (tadpoles), 68631-2 (skeletons), MCZ 35000-1, UMMZ 90873, 90874 (3), 90875 (tadpoles); La Primavera, UMMZ 90877 (tadpoles); Panzamala, UMMZ 90878 (tadpoles). _Baja Verapaz_: 32 km. N of Morazan, KU 68564 (tadpoles); _Santa Elena_, UMMZ 98119, 98120 (2). _Huehuetenango_: 1 km. E of Barillas, UMMZ 123136-7 (tadpoles). _Progreso_: Finca Bucaral, UMMZ 106783 (3), 123138 (tadpoles), S-1292 (skeleton). HONDURAS: _Atlantidad_: Mountains behind Ceiba, MCZ 21300. _Morazan_: Cerro Uyuca, UMMZ 123102-3. The _Ptychohyla schmidtorum_ Group Two species in group; adults having only vestige of web between fingers and lacking tarsal fold; pollex of breeding males lacking spinous, horny, nuptial tuberosities; mouth of tadpole greatly expanded, funnel-shaped, lacking lateral folds, and having 3/3 tooth-rows; breeding call consisting of series of short notes.