R.K. Selander, 1954 C. chiapensis 5.4 mi. along road from Tonalá to Arriaga (=NW) March 26 trees which had rather recently been chopped down. Mexicans were in the process of clearing a field and had chopped down most of the larger trees. After a time the chiapensis flew into a large tree near the house. At the same time as we were watching chiapensis, two humilis were foraging in the upper and middle branches of one large ad several small trees just above the other species. The call note of humilis is a very nasal-hollow-type "Chee-"chee-"chea." I followed on bird and heard this call repeatedly as I shared the bird -- it apparently was alarmed. There may have been two family groups or pairs reps in the area but we collected all 4 birds (humilis) within a short distance of one another. Later we noted alone humilis foraging in the upper branches of a large tree. It flew down into a dense clump of acacia and vines where I collected it after following it through the dense acacia stand. Many acacias, some of very large size, in this area, and few very tall trees. A man at the farm-house said that the humilis was is rare -- but we did not find it so. He said that the worms have eggs in May or June. In this same area we took another Thryothorus plourosictus - this individual was noted foraging a few inches above the ground in a dense bush.