C. jocosi 5 Tepehuana, 4600 ft., Puebla, Mexico May 8 A nest in construction, 15-20 feet up in a large thorn tree - Bonnie watched one worn gather fiber from fruit dried blossom cardelabra costus & carry to the nest - apparently being used as lining. Nos. 2205-2206 were working on nest - but Bonnie only saw 1 carry material. After who shot the 9 the o7 returned to the nest tree, perched on a branch near the nest and called - fast gua-gua-gua, etc. (costus won call) with tail wings held out from body. Bonnie collected this bird also. Bonnie also saw a costus worn carry fiber to a hole in a cardelabra costus - about 20 feet up - cling to projection spines near hole, then entered the hole. Bonnie shot at the bird and missed. Bonnie saw a worn on river bottom on rocks. I shot a pair and another in lone tree on the slope but found no nests. They are generally rather silent & when disturbed they fly away softly. May 9 near Cuetzla, 4400 ft., Puebla. - Hunted on a slope of deciduous trees & brush (very few species in leaf) without seeing C. jocosi. Thyrothorus pleurostictus was fairly common - much more so than in richer desert vegetation sq Malaneros. Costus seems to require larger trees - with thorns - there were lacking in this area - as were cardelabra costi.