February lst. There was early morning song of short duration. At 8:15 A.M. Brownie came out of the chaparral from near the nest location, sat on my knee to eat worms, then picked up a twig and carried it through the fence. I could catch glimpses of him through the dense foliage, placing it . A visit to Rhody's tree failed to disclose him. At 9:20 the performance of Brownie was repeated. A search for Rhody proved fruitless. He was not to be found in any of his accustomed haunts. About 10:20 while Brownie was drying himself after a bath, I went down to the sidewalk to see if the nest was visible from the south side. I saw something that looked like it and marked an arrow on the walk pointing to it. When B had dried himself he was given food and returned to work. (This has always been a typi- cal reaction). I went to the south side and Nova flew out of the marked location, followed by B. When B returned to work it was seen that the object previously located is the nest. 11:35. B is working at intervals at the nest, Nova frequently in the vicinity, but not seen actually working. B occasionally summons her with song when she is absent and she obeys. Neither sight nor sound of Rhody. The coincidence of his first spring song with his disappearance from his accustomed night roost, followed by his absence this morning suggests that he may have spring fever and be looking for a mate. Again the fact of his breaking into song while watching B start his nest, suggests that this operation may have conveyed suggestion to him reflecting on his own bachelorhood. During the rest of the day Brownie was at work whenever I visited the nest. Rhody was not seen and did not use his regular roost. at night