130 Aimophila carpalis Oct. 31 Pitahaya, 40 km. SE Empalme, 100 feet, Sonora. Observed several times in the past three days; four have been collected. Birds taken were in late stages of molt and not fat, suggesting that they are local residents. Further evidence on this point is that the species has been met only as pairs or individuals, either solitary and probably brief or in loose association with the small flocks of sparrows, mainly Spizella breweri, that drift about. Heard in song on the 29th and 30th, which days were warmer than today. One of the specimens collected had been singing from a prominent perch and then moved into a cactus-grass thicket where he continued with a whisper song before I shot. Two, [illegible] proved to be a pair, were earlier observed up in an open, dead shrub, the male in song. The note of this species is a reedy trcep. The song is monotonous weak, consisting of a series of notes prefixed variously by several higher or lower notes. A pattern of a typical song is as follows -- - . In notes, song, and actions, this species distinctly differs from Aimophila ruficeps. It moves about more like a spizellide; its manner of perching high on an open prominent twig and its posture distinctly suggests those of the eastern field sparrow. Nov. 1 Found today to be more common in an area where mesquite predominated and where the