LL Wolf 1964 Aimophila humeralis July 18 Cañon de Lobos, QniE. Guanacaz, Morlos, Mexico. bird flying just downhill from me (~20 feet from 1st bird.) lost track of exact location of both birds until heard pitza + then chatter about slightly uphill. Birds facing at 90° to each other and one ~6" higher. Were 12 to 15 inches apart. both birds apparently contributing to chatter. Bird facing to west flicked right wing during most of chatter but twice stopped right + flicked left for 1-2 sec. Bird facing S. did not flick wings as much but more of right than left. Then lost track of both birds. 10:20 - bird flew into tree (3' up) about 10' uphill from me. foraged in leaves near trunk for 5± sec. then had 1"+ caterpillar in bill. Joined by a 2nd bird & both flew off three hundred to N. Not possible to follow them closely. Moved in that direction + found at least two birds giving pit-za call. Flicked one from vine tangle 3 feet up. Other in tree on dead branches 8-10 feet up, both fly into canopy of densely foliated free where gave pit-za calls. 10:45 - bird foraging ~ 3 feet above ground, working primarily along bare horizontal branchage. Moves into foliated area + pers around. Moves toward leg before pecking. Works over to dead horizontal branch carrying a 1"+ larva. Sits with larva hanging from right side of bill. Then swallows + bill wipes. Pecks at branch + bill wipes again. Sits nearly motionless on branch giving chip,chip,chip irregularly,