It has been difficult to recruit and retain active Girls Service Organization (GSO) members who serve as official hostesses for all Armed Services YMCA (Young Men's Christian Association) programs and activities in El Paso, Texas (a bicultural setting). This study tested the hypothesis that the perceptions of institutional pressures by the two ethnic groups within GSO (Anglo American and Mexican American) would vary because of differential images accorded these two major cultural groups in the community. During November 1970, 14 Anglo American, 14 Mexican American, and 2 marginal (neither completely Anglo nor fully Mexican American) GSO hostesses were given a questionnaire utilizing realistic situations pertaining to the "Y", its programs, and the hostess' role. The girls were either currently active or had been active at one time in the near past. Six collectivities were assessed in terms of the hostesses' perceptions: family, immediate peers, school, church, adult friends, and YMCA-client servicemen. The Student's "t" test was used to determine significant differences between the two groups. No significant ethnic differences were found regarding perceived positive institutional pressures from the larger community. The major conclusion was that when a girl became a hostess, ethnic differences were overridden by other social characteristics. (NQ)