Pipilo maculatus 127 Nov.6-10 Casita', 40 fem. S Nogales, 3300 feet, Sonora. chief reason for its rarity. Where the species was met, it was found occurring in pairs or as individuals. The distribution and regular occurrence of pairs seemed to indicate residency of the species. Indivi- duals may have represented migrants or unmated birds, probably chiefly first- year individuals, from the local population. Towhees were quiet for the most part and would respond to squeaking with one soft, inquisitive zeee or remain quiet. If a vocal response was made, continued squeaking by the collector did not excite them further. Behavior of certain individuals that were chased or stalked again indicated local residency through reluctance of the bird to leave a "home" area; i.e., after moving a certain distance away from the spot where it was first found, the towhee would fly back or move circuitously in order to again return to a favored spot. P. maculatus occurred with P. fuscus along flat canyon bottoms near the mouths or in g canyons where suitable habitat for both occurred.