Llucelf 1963 Aimophila humeralis August 7 7 m.s. Piastla, Puebla, Mexico 2202 - juv. just finishing p.f. molt. Light back molt. Also tertials, wing coverts old. Stomach contained green caterpillar + other insect fragments. August 8 7 m.s. Piastla, Puebla, Mexico. found pair in small trees + shrubs between grazed, mowing area + cultivated field - on hillside. Both into a road-lighted 7 foot tree. One giving soft trill. Both hopped on branches in manner of grazing mice - hop, even about hop. One disappeared presumably to ground while other perched in top of 4 foot tegume still giving the soft trill. Given as once every 2 or 3 seconds. At 0639 flew briefly down to ground, a 5 feet from base of legume. Watched one fly down to few dead sticks lying haphazardly on ground. Hopped around on sticks + finally walked down to pick at something - apparently a stick then into 4-6 inch grass with scattered weeds where lost. Pair on brush pile 1 foot above ground. 2 birds about 6-8 inches apart giving chatter. Both were wing flicking but one more violently than other. More violent was (arrow pointing to left) flicking wing on side toward other bird much more than wing away from other. Seemed no difference between 2 wings on less violently displaying bird.