About 10:30, B called his mate several times from the nest and was answered by her in recognisable thrasher phrases. B seems to be doing all the nest-sitting. 11:30 . Roadrunner still here. 12:00. B sings from the top of the old oak, dives down to me, jumps to my lap, eats worms and then goes to the nest and at 12:15 is still sitting in it quietly. The reason for the nest-sitting of the male, when there are no eggs, is not evident. 1:30. B has been singing a great deal since the last entry. Just now he was singing near the oval lawn, using high-pitched, flute-like trills--an entirely different character of song from that usually heard with none of the more common phrases. When I stepped out into the up- per garden, he stopped singing, ran and flew up to me, jumped up to my hand as I stood on the lawn, then down to the grass at my feet, alternately digging lightly and continuing snatches of full song of his latest type. He then ran off toward the nest, calling at intervals. I am inclined toward the view that, for the present at least, his nest-sitting, calling and singing from there as well as from other points nearby are all intended to induce his mate to take up house- keeping at once--actively. Incidentally, I believe that he built this latest nest entirely without assistance from his mate, and that she is either not ready to lay eggs or "does not want to". It will be noted that Brownie's present behavior is radically different from that of the few days preceding my trip into the mountain and that he is "tamer". May 23rd. No early morning song heard. Neither thrasher was seen by me during the forenoon, perhaps because I was occupied with other matters most of the time. At 1:30 P.M. B was sitting in the nest. He called--was answered-- then left. Within a few minutes he was back again with his mate,