Three new species of the genus Leptepsilonema and one new species of Polkepsilonema are described. Leptepsilonema antonioi sp. nov. is mainly characterized by 111-115 overlapping annules with a large vacuolar ornamentation, a large body size and in male by number and arrangement of copulatory thorns; L. dauvini sp. nov. has 149-154 annules, ornamented with numerous fine vacuoles and fine outer ridges, and males possess a field of fine copulatory thorns at level of posterior ambulatory region and five minute thorns precloacally; L. horridum sp. nov. is characterized by 130-131 annules, ornamented with large vacuoles and spines, and males with copulatory thorns arranged in four subventral rows, the inner rows with five or six well developed thorns followed at some distance by one to two thorns, and long spicules (67-72 mu m). Polkepsilonema guirali sp. nov. is characterized by the number and location of copulatory thorns, the number of subcephalic setae, and the feature of the dorsal spines. A polytomous key to species level is presented for the genus Leptepsilonema.
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