Nov.8 Casita, 40 km. S Nogales, 3300 feet, Sonora. is overgrazed and that the local Mexicanos are constantly clearing the woodland of dead or dying trees. The substrate is very rocky, and over large areas there are [illegible] scattered oaks with abundant covering the narrow-leaved shrub and scattered herbs. Nov.9- Spent the entire morning and half of the afternoon on a long hunt south of camp in order to find a flat-bottomed canyon where towhees might occur in fair numbers. The upper slopes west of us were found to harbor only scant numbers of birds, probably in part because of the cold. One excellent towhee locality was found; three P. maculatus and three P. fusca were taken from this one spot and an additional individual of P. maculatus was left there. No significant additions or differences in the woodland avifauna were noted this morning, but return through the bottomland timber of poplar, willow, ash, walnut, and elderberry south of camp introduced me to a new habitat harboring species not met earlier. For example, Oberhalsena, Richmondena, Troglodytes aedon, Melospiza melodia; Zenaida asiatica. Centurus eupygius was very common.