85 Aphelocoma ultramarina Nov.6-10 Casita, 40 km.S Nogales, 3300 feet, Sonora. flock In manner of feeding, i.e., the scattering of individuals through foliage and on the ground with one or so few individuals perching quietly and watching, often from fairly prominent perches, and the slow drifting of the flock along a hill-slope, in these respects the Arizona jay strongly suggested Cyanocorax dickeryi also a flocking species in which adults and first year birds form apparently local unit groups. The species is characteristic of the oak woodland, but follows the woodland down canyons to lower elevations where mesquite becomes predominant and where riparian timber or open willow groves occur. It was noted that certain individuals of a group mildly disturbed would bob every now and then, as does the scrub jay. One bird almost always assumed a sentinel position, perching high and often holding to the perch until most or all of the flock had departed in flight.