Seven new species of Glossosomatidae are described from Bolivia. The seven new Bolivian species are: Mexitrichia collegarumn. sp., M. eduardoi n. sp., M. marini n. sp, M. usseglioi n. sp, Protoptila alumnorum n. sp, P. goitiai n. sp and P. myriamae n.sp. 18 species are recorded at the moment from Bolivia and northwestern Argentina: Merionoptila wigodzinskyi, Mexitrichiaalbolineata, M. bolivica, M. pocita, M. punensis, M. simla, M. argentinica, M. paraenchrysa, M. wygodzinskii, Protoptiladubitans, P. misionensis and the seven new species. A list of species of Glossosomatidae from Bolivia and northwestern Argentinais provided with new distributional records.