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                                            A.

                    Table I

Social Units of Pithecia monacha in the Caqueta'

No. of Individuals per Unit   No. of Units Counted

     1                            5
     2                            9
     3                            6
     4                            2
     5                            1
     6                            1

     The total number of units counted was 24. The total number of individuals counted was 60. The average number of individuals per unit was 2.50.
     Note: Many more individuals were seen thaei [[?]] are included in the table. The units which are recorded here (and in the following tables) are those which were seen under particularly favorable observational conditions, when I was fairly certain that I had counted all the individuals present at the time. In many other cases, it was obvious that I was seeing only part of a group.