If you are interested in the meta-methodology:
Literature Review: Data Sources
Articles on Black-White and Hispanic-White differences on tests of cognitive abilities were gathered from several sources including Psych-Lit of the American Psychological Association, Educational Resources Information Center (known as ERIC), Dissertation Abstracts Interna-tional, and Abstracted Business Information (known as ABI Inform). Reference lists and studies used by several narrative literature reviews and meta-analyses of related concepts were also examined (Dreger & Miller, 1968; Herrnstein & Murray, 1994; Jensen, 1980; Osborne & McGurk, 1982; Schmitt et al., 1996; Toquam, Corpe, & Dunnette, 1989). Attempts were made to overcome the “file drawer problem” by contact- ing test publishers and researchers active in the field. Letters were written to 6 major publishers of cognitive ability tests and 16 prominent researchers working in the area.
As such, it does not suggest that there are not high scoring individuals in both groups.