K. Dixon 1949 Parus wollweberi April 27. 8 mi S Whiteriver, 6100 ft, Navajo Co., Arizona In pinon-juniper-oak-yellow pine woodland after 12:00 noon. Heard pit-pit-pit song and also a song riddley riddley which I think was that of the Plain Titmouse. There was also a call see-see-na-nat, the first notes thin, high-pitched, the latter nasal, Bewich Wren-like (which if the 2 species gave this call I do not know). Possible competition - I followed up song of Bridled Titmouse & found pair in oaks at E end of patch of scrubby oaks where battle? had occurred. Eventually I took the ?? of this pair (# 371). April 28. Working over the same area 6:00 - 10:00 I encountered no Bridled Titmouse although Plains were abundant. In the evening (6:30-6:45) I met one Bridled Titmouse in a draw N of camp and perhaps another pair to N. April 29. E-facing pinon-juniper-oak slope in draw N of camp. 6:40 AM. Song pit-pit-pit (6+7 phrases) and answer kink kink (woodpecker-like) - was answer from a titmouse? location was to S where I had seen a Bridled Titmouse last night. The singing ?? which I saw was alone in pinon which may have been an outpost of his territory. By 6:44 he was singing 75 yards to N around a crescent shaped clearing.... pit-pit-pit - answer from across draw to E sweet-sweet --- (Plain Tit or Bewick Wren?) The Bridled ?? moved farther to NW & was silent after 6:49. I heard no more song from this territory although I went S to road & back twice and stayed within hearing distance until after 9:00 AM.