The species of the genus Xiphinema Cobb, 1913 are listed and their current status is indicated. A revised polytomous key to the 172 valid species (excluding the X. americanum-group) is presented. Because of the very large number of species the key is split into eight groups on the basis of development of the anterior female genital branch, uterine differentiation and tail shape. In accordance with the opinion of Cohn & Sher (1972) X.vulgare Tarjan, 1964 is considered a synonym of X. setariae Luc, 1968. X. cubense Razzhivin, 1973 is placed in species inquirendae. Longidorella chappuisi (Schneider, 1935) is transferred to Xiphinema and its possible identity with X. hygrophilum Southey & Luc, 1974 is discussed.
The codes for thirteen species of Longidorus, described since the acceptance for publication of the revised polytomous key (Chen et al., 1997) are given; together with notes on L. pisi, L. latocephalus and L. apuloides, and a correction of the original explanation of the code. L. chikmagalurensis is proposed as a junior synonym of L. psidii, and L. latocephalus as a junior synonym of L. pisi. Clef polytomique revisee pour l'identification des especes du genre Longidorus Micoletzky, 1922 (Nematoda: Dorylaimoidea). Supplement 1 - Les codes sont donnes pour treize especes de Longidorus decrites depuis l'acceptation pour publication de la clef polytomique revisee (Chen et al., 1997) avec des notes sur L. pisi, L. latocephalus et L. apuloides, et une correction du code original. L. chikmagalurensis est considere comme synonyme mineur de L. psidii et L. latocephalus comme synonyme mineur de L. pisi.
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