==============================+=========+=======+============+========== | Number |Maximum| Head length| Species | of | total |------------|Tooth-rows |specimens| length|Total length| ------------------------------+---------+-------+------------+---------- _P. euthysanota euthysanota_ | 23 | 40.8 | 30.9-37.3 | 4/6 | | | (33.5) | _P. euthysanota macrotympanum_| 13 | 43.3 | 30.6-33.4 | 4/6 | | | (32.7) | _P. leonhardschultzei_ | 7 | 47.5 | 29.2-32.7 | 4/6 | | | (31.1) | _P. spinipollex_ | 32 | 45.0 | 30.2-35.9 | 4/7 | | | (33.0) | _P. schmidtorum schmidtorum_ | 14 | 42.5 | 28.9-31.2 | 3/3 | | | (29.9) | _P. schmidtorum chamulae_ | 4 | 45.0 | 26.9-29.3 | 3/3 | | | (27.8) | _P. ignicolor_ | 2 | 39.6 | 29.6-29.8 | 3/3 | | | (29.7) | ------------------------------+---------+-------+------------+---------- Evidence on the pattern of development of tooth-rows indicates that the inner rows develop first. A small tadpole of _P. euthysanota euthysanota_ has six lower rows and three fully developed upper rows and only the beginning of the first (outer) upper row. A small tadpole of _P. euthysanota macrotympanum_ has four upper rows and five lower rows. In a small tadpole of _P. leonhardschultzei_ the three upper and four lower tooth-rows are well developed; the first upper and fifth lower rows are beginning to develop, and the sixth lower row is absent. In small tadpoles of _P. spinipollex_, the sixth lower row is poorly developed, and the seventh row is absent; large individuals normally have seven lower rows. A small tadpole of _P. schmidtorum chamulae_ has 3/2 tooth-rows. Breeding Call Breeding calls of all species and subspecies of _Ptychohyla_ were recorded in the field. Obtaining series of calls of _Ptychohyla_ is difficult because these frogs call mostly from vegetation along roaring mountain streams and only by locating a calling frog some distance from the water or along a quiet stretch of the stream can good recordings be obtained. For example, four individuals of _P. spinipollex_ were recorded, but only one recording was sufficiently free of background noise to be analyzed.