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[[circled]] 38 [[/circled]]
[[underline]] Ateles [[/underline]] ssp, Oct 29, 1960, V.

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Some of my young Reds have uttered one or a few Squ-type notes from time to time. I am becoming convinced, as a result of my observations of both young and adult Reds and Blacks, that all or most of the Squ's are nothing more than low intensity indications of other notes. Probably indications of different types of other notes in different circumstances.

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(After writing the above accounts, I went back to look at the young Reds, and saw one young juvenile direct MO & Lsh toward another.)

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The behavior of the adult Blacks has not changed very greatly since June of last year. The principal difference is that they are a little less strongly aggressive toward human beings now.

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The decline in their aggressiveness is shown by the fact that none of them has done Agg B toward me recently, or performed more than very slight Jud.

They usually respond to my appearance as follows. The [[male symbol]] usually rushes over to me with lots of MfB, occasional silent MO. The [[female symbol]]'s usually rush over with lots of silent MO, but little or no MfB.

Rather surprisingly, none of them has performed any extreme BT, with corners of mouth drawn way back, recently. I am even beginning to doubt that this species has a really distinct BT pattern apart from MO. Probably it has; but, if no, it must be largely or completely confined to very high intensity aggressive reactions.

The Black [[male symbol]] still becomes very agressive toward me from time to time. In such circumstances, he does not utter Agg. B as before, but another pattern which I probably over looked during earlier observations. I shall call this pattern "the Roar". When the [[male symbol]] is particularly aggressive, when he rushes over particularly rapidly, tries to bite me (through the wire of the cage) particularly vigorously, he usually utters one or more very low-pitched, "throaty" sounds which sound almost like the roars of