Xyloperthini, Lesne, 1921

Liu, Lan-Yu, Beaver, Roger A. & Sanguansub, Sunisa, 2016, A new Oriental genus of bostrichid beetle (Coleoptera: Bostrichidae: Xyloperthini), a new synonym and a lectotype designation for Octodesmus episternalis (Lesne, 1901), European Journal of Taxonomy 189 (189), pp. 1-12 : 10-11

Key to genera and species of Xyloperthini with 8 antennomeres

1. Antenna distinctly shorter than pronotum. Funicle subequal in length to first antennomere of club. Last antennomere with two distinct circular, sensory impressions. Elytral declivity with a large spine on each elytron. Female with unmodified third ventrite. Male without pleural pieces. ( Octodesmus ) (Od.) …………………………………………………………………………………2

– Antenna distinctly longer than pronotum. Funicle much shorter in length than first antennomere of club. Last antennomere without sensory impressions. Elytra with more than one costa, lacking spines on declivity. Female with third ventrite thickened and modified, overlapping and concealing fourth ventrite. Male with pleural pieces. ( Octomeristes gen. nov.) (Om.) ………………………3

2. Anterior angles of pronotum without a marginal tooth. Area above anterior margin of pronotum finely rugose. Metathoracic episternum with its interior margin convex. Spines on elytral declivity marginal. Larger species, 3.2–5.5 mm long …………………………… Od. episternalis Lesne, 1901

– Anterior angles of pronotum with a marginal tooth. Area above anterior margin of pronotum smooth and shining. Metathoracic episternum with its interior margin straight. Spines on elytral declivity inserted inside the margins. Smaller species, 2.0– 2.5 mm long ………… Od. parvulus (Lesne, 1897)

3. Elytra bicostate, the costae not convergent towards suture. Female fourth ventrite with a pair of long, thin spines in middle of posterior margin. Body reddish-brown with apical declivity darker. 1.8–2.5 mm long ……………………………………… Om. minutissimus ( Lesne, 1932) comb. nov.

– Elytra tricostate, the costae slightly convergent towards suture. Female with spines on fourth ventrite much smaller and concealed by 3 rd ventrite. Body pitchy-black. 1.9–2.1 mm long ………………………………………………………… Om. pusillus Liu & Beaver , gen. et sp. nov.