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[[circle]] 191 [[/circle]] [[underline]] serranus [[/underline]], Dec. 14, 1955, III. are not, however, the real equivalent of the PCC. The real PCC notes are long, pure, relatively soft, somewhat lower in pitch, often quavering, sometimes almost trisyllabic "Keeee-a-wah". It is these latter that usually accompany the Swoop (although the beginnings of some Swoops are accompanied by the higher, shriller, long notes), and occasionally continue (in a fading form) into, or even through, the Soar. I have finally heard a number of trisyllabic AlC's; but these are still obviously relatively rare - they only occur at the "highest" intensities (or the strongest relative strengths of escape?? very doubtful, as the birds don't retreat from me any more rapidly, or any further, when they give trisyllabic AlC's than when they give bisyllabic or monosyllabic AlC's) It would appear, in fact, that the trisyllabic AlC's of this species are never produced by such weak motivation as some of the trisyllabic AlC's of other species [[underline]] this is one of the more peculiar features of this species [[/underline]] Some of the birds flying above me have uttered repeated series of LCN's, mod. long, high + shrill, without pause between notes. Again, however, there was no trace of aerial L.C. [[underline]] I am beginning to think that this species may really lack an aerial L.C., as some of the birds flying above me have obviously had very high motivation indeed [[/underline]]. (It is possible, of course, that this escape drive have been relatively too strong to permit an L.C., but then one would expect the L.C. to be given by birds that do a lot of Swooping, etc And it is hardly likely that the LCN's I have heard would all be less aggressive than any L.C. that the species might have). Intermediate notes between LCN's and AlC notes are not infrequent. Almost bisyllablic "Keewup". I saw a lot of Swoops + Soars performed by the birds above me. All redirected; some in [[vamo?]], some upon other nearby birds flying around me Some of them were like the ones previously described, ie short