The validity is questioned of testing the intelligence of Mexican Americans via intelligence tests constructed for Anglo Americans. An overview is included of the literature concerned with the comparability of intelligence scores. Critiques are presented of 9 current studies utilizing intelligence test scores of Mexican Americans and Anglo Americans as a basis for comparative analysis. It is suggested that amount of acculturation is closely related to other variables involved in intelligence and should be investigated as a possible contaminating variable in measuring the intelligence of Mexican Americans. (JAM)