Selanda, 1954 61 El Mogote, Guerrero June 1 This species is very common here in the denser parts of the forest - it is a larger bird than that in Chiapas and the song is different - being both louder and consisting of a slightly different pattern. --- whistle trill ! < | , | | > | . There birds are not confined to underbrush (of which there is very little - but range up into the trees and sing near tops of trees. Songs heard constantly all during the day, Two nests seen both constructed as follows: 1.25. draped over a limb. branch Also took 2 Melozone kieneri - one on ground, other perched 1/2 feet from ground. Took one Thryothorus felix in dense vegetation not far from where I collected pleurotiotem. Heard difference not apparent. Song ! < | , | > | - a whistling quality. Aimophila humeralis is abundant. Also saw one group of Aimophila ruficauda. A Myiotherus flycatcher, yellow grosbeak, many Setornis puculatus, several canyon wrens, turkey vulture, zyga grandis (abundant) chalacloaca (heard) also noted. In a way Ti. pleurotiotum seems to be taking the place of Q. jocosus here. Jocosus is rare in this vegetation and probably rare throughout Guerrero since the only other place it has been collected is around Chilpancingo. The elevation is not too high for it here and there.