Besuchetionella new genus, with descriptions of eighteen new species from Asia (Coleoptera: Leiodidae: Agathidiini)

A key to the genera of the Agathidiini, a differential table of characters of the genera, and a cladogram of the relationships of the genera are presented. Besuchetionella new genus and 18 new species are described from the Palaearctic Region (2 species from Japan) and the Oriental Region (16 species): Besuchetionella ater n. sp. (Burma); B. bhutanensis n. sp. (Bhutan); B. caovansungi n. sp. (Vietnam); B. castanea n. sp. (Japan); B. grossa n. sp. (Indonesia: Java); B. javaensis n. sp. (Indonesia: Java); B. loebliana n. sp. (India: Madras); B. malayana n. sp. (Malaysia: Malaya): B. meghalayana n. sp. (India: Meghalaya); B. minuta n. sp. (Malaysia: Sabah); B. nepalensis n. sp. (Nepal); B. nipponica n. sp. (Japan); B. rufa n. so. (Philippines); B. sabahensis n. so. (Malaysia: Sabah); B. semipunctata n. sp. (Taiwan); B. taiwanensis n. so. (Taiwan); B. unicolor n. sp. (Cambodia); and B. watrousi n. sp. (Malaysia: Malaya).