The purposes of this 1969 study were to determine: (1) if differences existed in the self concepts of Negro, Anglo, and Spanish American adolescents and (2) the extent to which these differences were influenced by ethnic group membership, socioeconomic position, and sex. The sample for the study was made up of 425 Anglo, 40 Negro, and 142 Spanish American ninth-grade students in a school district in south central New Mexico. Instruments used in the study were the Tennessee Self Concept Scale (TSCS) and the Hollingshead Two Factor Index of Social Position. Results of the analysis indicated that of the 14 indices of self concept assessed by the TSCS, 4 scores were affected by the ethnicity variable. However, total self concept score was not significantly different for any of the 3 ethnic groups or for socioeconomic position. Male subjects had higher self concepts than female subjects with regard to physical appearance, health, skills, and sexuality. (TL)