Volunteers (N=83) from paired classes, including Mexican Americans, Anglo Americans, Black Americans and others, visually classified one another in regard to ethnic identity, in an attempt to assess the accuracy of visual identification when used by researchers to achieve such classification. Findings were that major ethnic groups were quite accurate in identifying Anglo and Black Americans, but all respondents erred twice as much in classifying Mexican Americans. Subjects self-labeled as Other were often misclassified by all respondents, and they were also less accurate in classifying the stimulus person. The conclusion was drawn that visual determination of ethnicity should probably be used only when no other means is available. (Author/TE)