Pipilo fuscus Nov. 6-9. Carità, 40 km. S Nogales, 3300 feet, Sonora. Not common, and considerably less numerous than P. maculatus, but found more or less regularly in or near large brush heaps on canyon flats or stream beds at low points in the Sierra west of camp. P. fuscus was found in each instance at point where in addition to the brush or shrubs, there were at least a few large trees, some varied rocky terrain with scattered large boulders and rocky slopes, or both. The crevices and passageways together with neighboring shrubs or herbs appear to provide sites favored for their feeding and hiding. On two occasions they were observed to fly up into large trees when disturbed on the ground. The species was observed in pairs or as individuals, evidently resident. But two notes were heard from fuscus, one a familiar tzep given by birds of the Berkeley hills, the other a strange, harsh two-parted note ai-uk, given several times in succession when the individual was disturbed and alarmed. In general, however, the species was exceedingly quiet.