Lasconotus Erichson, 1845

1. Antennal club consisting of three larger segments (IX, X and XI) of equal size (Figs 2, 3, and 4); elytral ridges 3 and 4 not joining with each other apically; metasternum wholly with sculpture 2

— Antennal club consisting of two larger segments (X and XI) and one medium-sized segment (IX); elytral ridges 3 and 4 joining with each other apically; metasternum lacking sculpture medially, only with hairs. Body length 1.90– 2.40 mm L. niponius (Lewis)

2. Body color yellowish brown; terminal segment of antenna transverse; antennal segments III and IV equal in length; ventrites with sculpture of babble-like pattern (Fig. 8). Body length 1.52–1.90 mm L. akitai sp. nov.

— Body color black; terminal segment of antenna rounded; antennal segment III more or less longer than IV; ventrites with sculpture of amoeba-like pattern (Figs 5, 6, and 7). Body length larger than 2.53 mm 3

3. Body glossy; third elytral ridge strongly inflated in apical part to join with fifth ridge; fourth ridge vanishing apically; anterior margin of pronotum well concave medially. Body length 2.70–2.85 mm L. sculpturatus (Sharp)

— Body mat; third elytral ridge normal, not inflated in apical part, joining fourth ridge; anterior margin of pronotum weakly convex or slightly concave medially. Body length 2.35–2.90 mm L. okadai Aoki