Some New Species of the Genus Leptaulax (Coleoptera, Passalidae) from Southeast Asia

摘要

Seven new passalid beetles belonging to the genus Leptaulax are described from Southeast Asia. Leptaulax riekoae sp. nov. from Thailand is characterized by the small flat body; Leptaulax immarginalis minangkabauensis subsp. nov. from West Sumatra is different from the nominotypical subspecies in the naked elytral shoulders; L. parvus balita subsp. nov. from South Kalimantan is different from the nominotypical subspecies in the large inner tubercles of head; L. acutangularis sp. nov. from Sabah, Borneo is characterized by the hairy frontal area, the acute anterior angles of pronotum and the punctate mesosternum and metasternal central area. Leptaulax labyrinthus sp. nov. from Sulawesi resembles L. immarginalis Iwase from Sumatra, but has different mouth parts; L. trajae sp. nov. is characterized by the hairy frontal area and the hairy shoulders; L. jaechi sp. nov. from Sulawesi is characterized by the punctate metasternal central area. A key to the species of the genus Leptaulax from Sulawesi is provided.