Rhesus monkeys either of wild origin or mother-reared in the laboratory were housed alone in small cages from birth to 6J years. Observations were made on 24 monkeys that were introduced singly into a small and a large test cage. Both the laboratory mother-reared and the wild-reared animals showed abnormal behavior. The extent of the normal behavior repertoire was not smaller in individuals showing a relatively large degree of abnormal behavior. In a large rage, more normal but less stereotyped locomotion was shown than in a small cage. However, nonlocomotory abnormal patterns were not influenced by cage dimensions. The various abnormal behaviors were randomly associated.

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