30 Nov.1 Pitahaya, 40km. SE Empalme, 100 feet, Sonora. Juvenal and adult plumages of one species, S. breweri. Considerable time was spent in the study of the rufous-wing, Amophila carpalis, the species account for which see. Nov.2 Returned to the north side of the slough to hunt. Birds very active and abundant this morning, the local population being augmented by an influx of migrants. Geothlypis, Passerina amoena (several seen), more spezzella and crown sparrows, including a black-throated sparrow (collected) in and warblers Vermivora and Dendroica one of the flocks, Myiarchus all appeared today. were particularly abundant. The yellow throats were Nov.3 Returned again for a brief hunt on the north side of the slough. The weather turned cold last night, and apparently most of the migrants present yesterday left. Geothlypis and Passerina amoena were noted again. Numbers of ducks on the slough have fallen off in the past few days, mostly possibly due to the repeated shooting. Leopold and Russell observed a pair of Anser albyroni briefly this morning. Nov.4 Broke camp and headed northward to Empalme, Guaymas, and Hermosillo. Camped about 70 miles north of Hermosillo. Nov.5 Continued northward to Casita about 40 km or 25 miles south of Nogales and established camp in a valley which drains into the Rio Magdalena.