Lasconotus Erichson, 1845

Aoki, Jun-ichi, 2018, Japanese Species of the Genus Lasconotus (Coleoptera: Zopheridae: Colydiinae), with Description of a New Species from Ishigaki-jima Island, the Ryukyu Islands, Species Diversity 23 (1), pp. 69-74 : 73

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

Figures

Figs 1–4. Antennae (right side) of the four Japanese species of Lasconotus.—1, L. niponius (Lewis, 1879) (JAC-1); 2, L. okadai Aoki, 2011 (JAC-8); 3, L. sculpturatus (Sharp, 1885) (JAC-11); 4, L. akitai sp. nov. (paratype, NSMT-I-C 200239). Scale bars: 0.1mm.

Figs 5–8. Anterior part of ventrites of the four Japanese species of Lasconotus.—5, L. niponius (Lewis, 1879) (JAC-1); 6, L. okadai Aoki, 2011 (JAC-9); 7, L. sculpturatus (Sharp, 1885) (JAC-11); 8, L. akitai sp. nov. (paratype, NSMT-I-C 200239). Scale bars: 0.1mm.