1. Elytron each with three longitudinal series of discal setae (apart from preapical seta), which are in stria 2, 3, and 5; preapical setae of elytra in apical curve of stria 2; apical portions of elytral striae showing weak anastomosing tendency................................................................... Trechiotes Jeannel

— Elytron each with at most two longitudinal series of discal setae (apart from preapical seta), which are in the area between interval 3 and stria 5, excepting individual aberrancy; elytral striae usually forming apical anastomosis.................................................................................................................2

2. The first four pores (humeral set) and pore 5 of the marginal umbilicate series of elytra close to or adjoining marginal gutter, distance between the pore 1 and the pore 4 usually divided into three subequal parts by the insertions of the pore 2 and 3.................................................................................3

— Pores 1, 3, 4 and 5 of the marginal umbilicate series of elytra more or less removed from marginal gutter dorsad, and pores 1–4 are usually unevenly arranged also in longitudinal direction; preapical setae of elytra always present.......................................................................... Rakantrechus Complex

3. Pronotum barrel-shaped, with sides hardly sinuate before hind angles, with both front and hind angles hardly produced; striae of elytra deep and coarsely punctate; elytral discal chaetotaxy (3–4, 2–3); preapical setae of elytra in apical anastomosis of striae 2 and 3..................... Accoella S. Uéno

— Pronotum usually cordate to subcordate, rarely subquadrate to subcampanulate, with sides usually sinuate before hind angles, with both front and hind angles produced in most cases; striae of elytra variable in depth, and usually less coarsely punctate than in the above entry; number of elytral discal setae variable from 0 to 5 in both inner and exterior series according to species; preapical setae of elytra either present (usually in apical anastomosis of striae 2 and 3) or absent................................................................................................................................. Trechiama Jeannel