We evaluated the cross-sex and -ethnic (Hispanic/Latino, non-Hispanic White) measurement invariance of anxiety symptoms based on the Spence Children's Anxiety Scale (SCAS) as well as SCAS anxiety symptoms' correspondence with scores on the 5-item Screen for Child Anxiety Related Emotional Disorders (SCARED) and teacher ratings of child anxiety. Based on data corresponding to 702 children (M age = 9.65, SD = 0.70; 51.9 % girls; 55 % Hispanic/Latino), findings showed some sex and ethnic variations in SCAS measured anxiety at the item and scale levels. Moreover, SCAS correspondence to the 5-item SCARED was found across ethnicity and sex. SCAS correspondence to teacher ratings was found for non-Hispanic White boys and non-Hispanic White girls, marginally in Hispanic/Latino boys, and poorly in Hispanic/Latino girls.