R.K. Selander, 1954 76 Tonalá to Tres Picos, Chiapas, México April 12 On train to Tres Picos. Heard a small Campylophorus sing a side of railroad where there is a dense stand of guanuche & guanacaste about 1 mi. from Town. Along the Rio Sanatenco near town there is no big stand of riparian vegetation. Instead the guanuches extend up to the stream bed. The same forest of guanuche which occurs SE of Tonalá (beyond the river) occurs SW towards the ocean. Very rocky soil - distinctly drier than further out toward the ocean where we were camped. This is a continuation of the ridge of foothills just in back of Tonalá. Extensive areas are being cleared. From the dry hills behind Tonalá the land slopes gently down to the SW. (Should collect plants on the hill just behind Tonalá to determine if this dry deciduous forest is not the same as that which occurs SE of town.) Tonalá is situated immediately adjacent to the ridge of low hills - in fact part of the town is on the lower part of this ridge of hills. The Sanatenco flows fairly rapidly near town over an extremely rocky bed. Hence difference in vegetation near the hills and out on the flats nearer the ocean may be in part result of edaphic differences in the two areas.