Paratylenchidae n. fam. with descriptions of five new species of Gracilacus n. g. and an emendation of Cacopaurus Thome, 1943, Paratylenehus Micoletzky,1922and Criconematidae Thorne, 1943. Proceedings of the Helminthological Society of Washington, 29 1962: 189-207. cilcCccill [Zoological Record Volume 99]