Campylorhynchus 62 Rio Tiltipac April 9 The study area was located along the banks of the Rio Tiltipee. Near the water there were large amates and back a bit the guanocote & guanucild were common - some of the former huge trees as were some of the amates. Back from this riparian growth there were narrow bands of [illegible] hull acacia and a shrubby tree - the latter cleared fields or turned over areas. Our study was confined to the riparia immediately adjacent vegetation. Roll # 12 color shows various parts of the study area. No amate mangoes present in the area. Significant observations are as follows: (1) Two pairs or groups of chiapensis were present in the area. One pair had a nest (see map) near the water in an acacia which was green. The nest was 9- /0 just above ground & was of the usual large size. Noted both birds carrying material which they picked up on the ground near the nest. Male sexual observations of this pair foraging in the weiner and amate around the clearing. Bonnie matched this pair scratching in the leaves at the base of a big amate. On other occasions, we saw the pair high in the amates - so they apparently forage at all levels - frequently on the ground - a thing which we have yet to see humilis do for any more than a moment two. Several times both humilis and chiapensis were seen in the same guanamate foraging at the same