R.K. Selander, 1954 39 Rancho Oreonez, SE Tonala, Chiapas April 1 It thorny - many thorn vines and the combination of vines & bushes forms an almost impenetrable mass about 10 feet high at best - although an occasion small tree is taller. Found one possible nest place up about 8 feet in a fairly sized bush area in a clearing at the edge of one of these dense masses of bushy thorn veg- etation (could have been nest of a flycatcher, however). I judge that there is a fair population with area. We did not find wrens in the busher, large-tree forest vegetation adjacent to the rivers, but rather in the thinner areas in the dense bushes and small trees. Bonnie did not see or hear any around camp this morning - although we occasionally hear one sing not too far distant from our tent. The only song I have heard here is the "Pico-weet, pico-weet" song. The saw- a'gua notes of nigricaudatus are seen huskier than those of humilis. There was little singing this morning about the wrens were fairly active. In the same place where we collected nigricaudates, Bonifacio shot a Thryothorus pleurostictus and I a Thamnophelus doliiatus (o). Will have to look over the country better tomorrow but I believe that the bushy growth frequented by the wrens is a secondary vegetation the coming in on cleared areas.