EN
A new stegelytrine genus from South East Asia, Trunchinus gen. nov., and three new species (T. laosensis sp. nov., T. sinuatus sp. nov. and T. medius sp. nov.) are illustrated and described. A key to stegelytrine genera is given. The morphological variation found within this genus and its similarities and differences to other stegelytrine genera are discussed. The known host plants of Stegelytrinae are given and 'mud-puddling' behavior in the new genus and other taxa is discussed.