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[[circled]] 5 [[/circled]] [[underlined]] Ateles fusciceps [[/underlined]]. Oct. 2, 1958, IV. [[Image left margin - three vertical lines and a rectangular shaped hashed section in pencil]] B was usually (always?) accompanied by scratching (Sct.). Using one hand to scratch the other arm, or head, or back, or leg, or tail. Very conspicuous and regular. Not every note was accompanied by Sct; but when Sct. did occur it was closely synchronised with B notes, i.e. one note accompanied by one Sct. movement, one note accompanied by one Sct, etc., etc., etc. In general, I think that L always began Sct. whenever he wasn't running or swinging about the cage during B. Sct. could apparently occur at all levels of B motivation. In one case, at least, it even started just before the B began; but it continued right up to the highest intensity B notes as well. Probably least frequent with Agg B, if only because the animal tends to be jumping up and down then. Most peculiar. Obviously "displacement" - in the classical sense - whatever that may mean. The frequency of Sct in hostile situations is the more remarkable in view of the fact that the animals don't seem to do much normal ["autochthonous"?] scratching in other circumstances. All the scratching of any kind performed by S and L I saw today was with the arms & hands. None with legs & feet, or tail. But I did see one of the older Spider Monkeys at the Gorgas scratch its back once with the tip of the tail. Probably quite autochthonous. I have seen absolutely no attempts to clean the face by rubbing it along the ground or branches. The only face-clean-