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Atlapetes, Apr. 13, 1961, III 45 [[image - sketch of bird]] High bow posture. Later in the morning, I suddenly became aware that one of the Chestnut-capped Atlapetes was "singing" quite loudly. Comme ça: "za-weeeeeee za-weeeeeee za-weeeeeee Repeated again & again. The second note of each doublet had a definite rattle undertone. Much stronger & louder (almost pure R) in the second note of the last doublet. Unfortunately, I could not see the bird well while it uttered this vocalization. I was, however, able to determine that the bird was perched in a tangle of vines, at least eight feet above the ground, while it uttered this vocalization. This is by far the highest I have ever seen a chestnut-capped Atlapetes. The bird also seemed to be alone (I don't know what happened to its mate). But then a sudden aerial chase and fight developed! I couldn't catch the details of this. Certainly involved two birds. Certainly one chestnut-capped and possibly another chestnut-capped or a flycatcher. (I am fairly certain that the bird uttering these "Za-weeeeeee, za-weeeeeee, za-weeeeeee" vocalizations had considerable Thflff, and it probably had some CR also. Both birds of the pair were back a few minutes later. Behaving