A preliminary study of Erigonine spiders (Linyphiidae: Erigoninae) from Vietnam

Nine erigonine spiders from Vietnam are described after examing the collections studied by Simon and additional specimens collected in 2000. Erigone orientalis Simon, 1909, and E. tonkina Simon, 1909 are junior synonyms of Hylyphantes graminicola (Sundevall, 1830); Trematocephalus acanthochirus Simon, 1909, is a junior synonym of Ummeliata insecticeps (Bosenberg Strand, 1906); Trematocephalus bivittatus Simon, 1909, is a junior synonym of T. eustylis Simon, 1909, and is transferred here to the genus Nasoona Locket, 1982. Aprifrontalia quadrialata Gao, Xing & Zhu, 1996, is a junior synonym of Gongylidioides onoi Tazoe, 1994. Four new species are described: Erigone brevipes new species, Erigone grandidens new species, Gongylidiellum linguiformis new species, and Walckenaeria caobangensis new species.