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May, 1910 THE OLIVE WARBLER IN SOUTHERN ARIZONA 105 surprisingly short time she became reassured enough to resume her duties of incu- bation. Shortly a lull in the breeze gave me the opportunity desired and a click of the shutter told me an exposure had been made. The result is shown herewith. Her alert attitude is probably due to the fact that I had cleared away so many of the concealing twigs. I later made a closer exposure of the nest and eggs, having brought them safely to the ground. This nest is now before me and a detailed description may not be amiss. It is supported by ten small live twigs from the size of a pencil down, all growing from a branch about five eighths of an inch in diameter. It is composed outwardly of moss and pine bud hulls with plant down scattered thruout. The proportion of this latter increases until the lining is reacht where it forms a felt like a humming- bird's nest. This lining is supplemented with a few very fine rootlets. The great- est outside diameter is three inches, inside, two inches; outside depth three and Fig. 29. OLIVE WARBLER ON THE NEST one-half inches, inside one and one-half inches. The most interesting set taken this year was located and collected June 2. I had, on a previous occasion, heard a male singing among some pines where I had also heard him the year before. On my arrival there about ten o'clock that morning he again saluted me with his song. I began to trail him. First in one tree, then in another he hopt arounkl. Finally, my continued presence seemed to worry him. He began to call with a peculiar whistle-like note and was shortly joined by the female. For half an hour they led me back and forth. I tried to keep her in ight all the time and was greatly assisted by her call note which differs consider- '?ly from that of the male. Finally, however, she gave me the slip, and the .le, also, becoming silent, disappeared among the tree tops. Twenty minutes ter I heard him again and ran toward him. I soon located him in a pine and ,w that he had an insect in his bill. He was making short flights from one tree to uother calling and singing as he went. Then he flew into the top of a partially