Genus Aulacogenia Stål 1870

Aulacogenia Stål 1870: 700; Stål 1874: 86; Lethierry & Severin 1896: 85; Distant 1910: 186; Hoffmann 1944: 8; Miller 1954: 209; Hsiao & Ren 1981: 477; Putshkov & Putshkov 1985: 100; Maldonado-Capriles 1990: 493; Putshkov & Putshkov 1996: 208; Zhao et al. 2005: 23. Type species: Aulacogenia corniculata Stål.

Diaditus Distant 1904: 226 . Type species: Diaditus semicolon Stål.

Allomastix Bergroth 1906: 4. Type species: Diaditus errabundus Distant.

Diagnostic characters. Body small to medium-sized, body oblong and gradually widened posteriorly, dullcolored, covered with short hairs. Head cylindrical, gular region strongly excavated and with a deep, wide furrow in which part of rostrum and antennae lie at rest. Eyes medium sized, widely separated. Anteocular portion longer than postocular portion; antennal tubercles prominent, inner antennal processes usually conical; each side of lower margin of postocular portion with 2 to 3 nodular tubercles; antenna short, first segment thickest and subequal to 2 apical segments together, second segment longest, third segment shortest; first segment of rostrum strong, about as long as 2 apical segments together. Anterior pronotal lobe slightly shorter than posterior pronotal lobe, anterior lobe with sculpture, posterior lobe usually with longitudinal carinae, humeral angles rounded or tubercular or subspinously produced. Femora nearly same thick, tibiae compressed. Posterior angles of each segment of connexivum not or protruded laterally. Parameres wide, short, bent, blunt.

Distribution: Oriental Region.