Palm prints of 166 Peruvian Cashinahua Indians from 3 villages were analysed for main line terminations and palmar patterns. Bilateral differences but no sex differences were observed with regard to main line terminations. Patterns in thenar/first and interdigitallV areas show bilateral variation, but none shows sex differences. The Cashinahua differ from other Amerindian groups in palmar patterns, but are similar to the Pewenche Indians of Chili with regard to the main line index. Considerable intervillage variation exists which may be explained in terms of micro-evolutionary processes acting on a small, isolated population.