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[[circled]] 19 [[/circled]] Tangara, Aug. 14, 1958, II [[yellow color hatch]] and sometimes, at least, more constantly noisy. All I have heard them utter is single CN's; but there can be repeated at frequent intervals in long series. Very distinctive in sound. Harsh and buzzy; quite Cicada-like. Might be transcribed as "Taanh" or "Tsaaanh". I haven't seen any of the Silver-throats join mixed flocks as integral or nuclear members; but they sometimes feed in fairly close proximity to mixed groups of warblers, flycatchers, etc. Tangara, I August 15, 1958 Cerro Campana. [[green color hatch]] I have seen several more cases of Greens uttering a series of notes when taking flight. Just as described yesterday. I also watched 2 greens, which I presume were mates,(one of them was less brilliant than the other, with a definitely duller rufous "cap", and I presume this was the [[female symbol]]). In a tree, somewhat disturbed by my presence. Both uttered CN's, not very rapidly, without ritualized postures or movements. The notes of the [[male symbol]] were definitely louder & harder than those of the [[female symbol]], almost "Tuck"-like. Always single. The notes of the [[female symbol]] were thinner & weaker, perhaps sometimes more long-drawn. She uttered both single notes and doublets - -, frequently in alternation. For a long time she sat uttering these single notes and doublets at quite regular, approximately four or five second, intervals. Later on, the [[male symbol]] flew-away; and the [[female symbol]] made no attempt to call him back.