Xyloperthini Lesne, 1921

Liu, Lan-Yu & Beaver, Roger A., 2023, A new West African genus of Bostrichidae (Coleoptera), and a key to the Afrotropical genera of tribe Xyloperthini, European Journal of Taxonomy 885 (1), pp. 21-32 : 27-28

Key to the Afrotropical genera of Xyloperthini Lesne, 1921

Lesne (1901) offered the first key to the genera of Xyloperthini . Since that time many new genera have been added to the tribe (see Introduction). Liu & Sittichaya (2022) provided a key to the Oriental genera of the tribe. Here we add a key to the ten genera present in the Afrotropical region (only the three (ex 17) species of Xylopsocus which occur in the region have been included).

1. Antennae with 9 segments ................................................................................................................ 2

– Antennae with 10 segments .............................................................................................................. 3

2. Antennal club segments 1‒2 with distinct sensory maculae near anterior margin; frons with erect, long hairlike setae; pronotum without lateral carinae and postero-lateral angles rounded ................................................................................................ Enneadesmus Mulsant, 1851

– Antennal club without distinct sensory maculae; frons without long hairlike setae; pronotum with lateral carinae and postero-lateral angles almost rectangular ............................................................. ............................................................................................ Xylopsocus capucinus (Fabricius, 1781)

3. Asymmetrical pronotum with more accentuated development of the right anterior part ................... .............................................................................................................. Amintinus Anonymous, 1939

– Symmetrical pronotum ..................................................................................................................... 4

4. Frons with long hairlike setae ........................................................................................................... 5

– Frons without long hairlike setae ...................................................................................................... 6

5. Smaller species, 3‒4.5 mm long. Pronotum without lateral carinae; postero-lateral angles rounded; a pair of long spines on sides of 3 rd ventrite, and posterior margin of 5 th ventrite of female sinuate ....... ......................................................................................................................... Xylionopsis Lesne, 1937

– Larger species, 5.5‒8.5 mm long. Pronotum with lateral carinae which form distinct postero-lateral angles; ventrites simple in female .................................................................. Xylothrips Lesne, 1901

6. Antennal club without distinct sensory maculae; last ventrite of male without pleural pieces; ventrites simple in female ................................................................................................................................ 7

– Antennal club segments 1‒2 with distinct sensory maculae near anterior margin; last ventrite of male with pleural pieces; ventrites modified in female ............................................................................. 8

7. Body: 3.3‒10 mm long. Pronotum without lateral carinae, postero-lateral angles rounded; apical margin of declivity with tiny, V-shaped emargination with raised sides. Xyloperthella Fisher, 1950

– Body: 3‒5 mm long. Pronotum with lateral carinae forming distinct postero-lateral angles; apical margin of declivity entire with slightly raised apex ........................................................................... ............................................................................... Xylopsocus Lesne, 1901 (castanoptera, sellatus)

8. Length of body greater than 6 mm. Postero-lateral angles of pronotum obvious; apical margin of declivity with U-shaped emargination with raised sides, and a deep emargination of postero-lateral margin on each side near to apex; female ventrites modified on 5 th ventrite only .............................. .................................................................................................................... Plioxylion Vrydagh, 1955

– Length of body less than 6 mm. Postero-lateral angles of pronotum rounded; apical margin of declivity with V-shaped emargination in both sexes, or at least in male; female ventrites modified on 4 th or 3 rd and 4 th ventrites ................................................................................................................... 9

9. Antennal club segments 1‒2 without distinct sensory maculae ...................... Plesioxylion gen. nov.

– Antennal club segments 1‒2 with distinct sensory maculae near anterior margin ......................... 10

10. Elytral declivity with 3 pairs of spines, the largest pair in middle of upper margin; apical margin with V-shaped emargination with raised margins, and a deep emargination on each postero-lateral margin. Female abdomen with modified 3 rd to 5 th ventrites ................................. Xylion Lesne, 1901

– Elytral declivity with two pairs of small spines on upper margin; apical margin with a small V-shaped emargination with raised margins, but without emargination of postero-lateral margin. Female abdomen with modified 4 th and 5 th ventrites ................................................. Xylionulus Lesne, 1901