94 Parus wollweberi Oct. 22 El Batel, 5100 feet, Sinaloa Fairly common in the oak-june woodland, generally avoiding the more dense, almost forest- like stands. Observed repeatedly in the past week, most frequently in small flocks accompa- ned by creepers, kinglets, migrant warblers, etc. and calls. In actions this species is distinctly chickadee-like; and resembles P. atricapillus or P. gambelii more closely in these respects than P. bicolor or P. unimaculatus. Once a lone individual was found singing; the song was similar to that of the two "titmice" mentioned above, put-o-puto-puto; except that it seemed to be given more rapidly and did not sound quite so loud.