de Man (1880) described the species Tylenchus macrophallus, obtained from pasture soil, and in a later publication (1884) gave a fuller account of it with drawings. Reasons are given later in the present paper for the removal of this species to the genus Paratylenchus. Micoletzky (1921) established the genus Paratylenchus containing but one species, namely, P. bukowinensis, obtained from around grass roots near Czernowitz in Bukowina. The description was based on a single female specimen which was found only after mounting in glycerine. In spite of this, however, the distinctive characters of the genus were clearly indicated and are sufficiently marked to separate it from the nearly related genus Anguillulina. Cobb (1923) gave a detailed description of the anatomy of another species, also obtained from around grass roots, under the name of Paratylenchus nanus, which he considered might be synonymous with P. bukowinensis, and a brief account of an immature form which he called P. anceps but which very closely resembled his P. nanus. In the case of both of these forms only females were found.