The species of the genus Microtrichalus Pic, 1921 represented in the Philippines are revised. Six species are placed in the genus; in addition to M. basipennis (Pic, 1926), two species are described as new (M. retractus sp. n. and M. salvani sp. n., both from Mindanao), and three species are transferred from the genus Trichalus Waterhouse, 1877: M. bakeri (Kleine, 1929) comb. n., M. costilis (Kleine, 1926) comb. n. and M. communis (Waterhouse, 1879) comb. n. A key to the six Philippine Microtrichalus species and illustrations of their important diagnostic characters are provided. Trichalus nigricauda Bourgeois, 1886 and T. longicollis Bourgeois, 1883 are transferred to the genus Leptotrichalus Kleine, 1925. Leptotrichalus mindorosus Pic, 1925 is proposed to be a junior subjective synonym of Leptotrichalus longicollis (Bourgeois, 1883).