Corvus corax Oct. 18 El Batel, 5,100 feet, Sinaloa One pair observed circling over a part of the high ridge above camp. Oct. 21 Apparently the same pair, present in the same area as recorded above. Nov. 10 Sonora. Noted commonly throughout the desert region; the species being distributed as locally resident pairs. Both at Pitahaya and Casita, members of local pairs were seen repeatedly in the same area. Large flocks, numbering 20 to 30 individuals, possibly representing concentrations of first-year birds, were noted only twice, once along the Guaymas-Nomvills road on Nov. 4 and again just north of Casita on Nov. 11. In the light of my past experience with this species, I was greatly impressed with its abundance and regular distribution in the desert scrub and mesquite-cactus regions of Sonora.