Xyloperthini Lesne, 1921

Liu, Lan-Yu & Sittichaya, Wisut, 2022, The Oriental genera of Xyloperthini (Coleoptera: Bostrichidae: Bostrichinae), with a new genus and species from Thailand, and a key to the genera, European Journal of Taxonomy 828, pp. 45-60 : 52-55

Key to the Oriental genera of Xyloperthini Lesne, 1921 (see also Table 2)

1. Antennae with 10 segments .............................................................................................................. 6

– Antennae with less than 10 segments ............................................................................................... 2

2. Antennae with 8 segments ................................................................................................................ 3

– Antennae with 9 segments ................................................................................................................ 4

3. Antennae 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 of last abdominal ventrite ...................................................................................... Octodesmus Lesne, 1901

– Antennae 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 of last abdominal ventrite ....... Octomeristes Liu & Beaver, 2016

4. Antennal club segments without clear sensory areas. Pronotum with lateral carinae and posterolateral angles pointed .............................. Xylopsocus Lesne, 1901 ( capucinus , intermedius , radula )

– Antennal club segments with clearly visible sensory areas. Pronotum without lateral carinae and postero-lateral angles rounded .......................................................................................................... 5

5. Dense sensory hairs along anterior margin of 1 st and 2 nd antennomeres of club. Frons without long erect hairs. Declivital disc flattened. External face of protibia grooved. Male with pleural pieces of last abdominal ventrite ................................................................................. Xylophorus Lesne, 1906

– Antennal club segments without distinct impressions, only areas with denser pores. Frons with long erect hairs. Declivital disc concave in male and convex in female. External face of protibia flattened. Male without pleural pieces of last abdominal ventrite ...................................... Psicula Lesne, 1941

6. Antennal club segments without clear sensory areas. Pronotum with lateral carinae and posterolateral angles pointed ........................................................................................................................ 7

– Antennal club segments with clearly visible sensory areas. Pronotum without lateral carinae and postero-lateral angles rounded .......................................................................................................... 8

7. Body 3.5–4 mm in length. Frons without long erect hairs. Male without pleural pieces of last abdominal ventrite ............................................................................. Xylopsocus Lesne, 1901 (part)

– Body 6–7.5 mm in length. Frons with long erect hairs. Male with pleural pieces of last abdominal ventrite ........................................................................................................... Xylothrips Lesne, 1901

8. Frons with long erect hairs. Apical margin of declivity entire. Last abdominal ventrite of female without emargination ........................................................................................................................ 9

– Frons without long erect hairs. Apical margin of declivity emarginated. Last abdominal ventrite of female with emargination ............................................................................................................... 10

9. Body 4.5–5 mm in length. Declivital disc flattened. Declivity obliquely sloping and without spines on upper margin ........................................................................................... Paraxylion Lesne, 1941

– Body 6–8.5 mm in length. Declivital disc slightly convex. Declivity steep with three pairs of spines on upper margin ............................................................................................ Xylodrypta Lesne, 1901

10. Sensory areas on antennal club segments indistinct. Declivital disc not sexually dimorphic. Male without pleural pieces of last abdominal ventrite ............................................................................11

– Sensory areas on antennal club segments distinct. Declivital disc sexually dimorphic. Male with pleural pieces of last abdominal ventrite ........................................................................................ 12

11. Body 2.2–3 mm in length. Antennal club segments without distinct impressions, only areas with denser pores. Declivital disc evenly concave. Protibia expanded from base to apex, external face convex. In female, 4 th abdominal ventrite extended over 5 th as a thin, leaflike, plate, convex ventrally; the middle part of the 5 th abdominal ventrite slightly emarginate ................. Calonistes Lesne, 1936

– Body 3.5–6 mm in length. Antennal club segments with two indistinct areas of sensory hairs at anterior margin of 1 st and 2 nd antennomeres of club. Declivital disc slightly convex. Protibia expanded from base to apex, external face flattened. Abdominal ventrites not sexually dimorphic ...................................................................................................... Xylodectes Lesne, 1901

12. Antennal fossa inserted next to lower intero-lateral margin of eyes. Antennal club with two areas of concentration of sensory pores on 1 st and 2 nd antennomeres. Protibia expanded from base to apex with broadly, shallowly grooved external face. In male, upper margin of declivity without processes, a small V-shaped emargination at apex of declivity. In female, apex of each elytron

strongly emarginate, emargination filled by a pair of ventrally-directed processes next to suture, 5 th abdominal ventrite strongly emarginate in middle posteriorly ....................... Infrantenna gen. nov.

– Antennal fossa inserted next to middle intero-lateral margin of eyes.Antennal club with dense sensory hairs along anterior margin on 1 st and 2 nd antennomeres. Protibia expanded from base to apex with broadly grooved external face. In male, upper margin of declivity with a pair of tiny teeth, entire apex. In female, declivity with a Y-shaped carina on lower half, apex entire with one pair of distinct tubercles at the apex, 5 th abdominal ventrite broadly emarginate posteriorly .... Xylocis Lesne, 1901