57 NW Tonala April 8 To a point about 4 miles NW Tonala' is uniformly low and deciduous. The titoposte & guanacaste, [illegible] ferns are almost the only large tree or leaf. the vegetation is the same scrubby type so common in the Jthmus of Tichuantepec region - it ends 4 mi. NW Tonala where it suddenly becomes richer with anates, mangoes, palms, stone fronds of trees covered with the Corrolines -- like, purple-flowered vines. The hedge rows are green & lush looking compared to paths out along the road. At the point where we worked the hills, are very close but the main mass of the vines is for removed / or very low. It is low at [illegible] Arriaga where the road passes up to Tutula. I do not know whether brimlei is in the foot- hills, but the vegetation is small trees, rather sparsly spaced -- same as on the foothills in the Ocuilopa valley and I don't think the small vines occurs in it. In any case the tops of these hills are almost barren. Thryothorus pleurostictus is commoner than any- where else in the area and occurs in exactly the same spots as does brimlei - but invariably, it forages on the ground or at the base of bushes while brimlei is in the medium middle portions of the small deciduous trees, in the ococia, or on the branches of the guanacaste. I can see no cliff --