Arixyleborus moestus (Eggers, 1930)

Smith, Sarah M., Beaver, Roger A. & Cognato, Anthony I., 2020, A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China, ZooKeys 983, pp. 1-442 : 1

Arixyleborus moestus (Eggers, 1930) Fig. 27C, D, J

Xyleborus moestus Eggers, 1930: 189.

Arixyleborus moestus (Eggers): Browne 1955: 350.

Type material.

Holotype (FRI).

New records.

Bhutan: W. distr. Thimpu, E Dochu La Menshunang, 2400 m, 7.vii.1988, C. Holzschuh (RABC, 1). Laos: Houa Phan, Ban Saluei - Phou Pan Mt., 20°12-13.5'N, 103°59.5-104°01'E, 1340-1780 m, 15.iv-15.v.2008, Lao collectors (MNHP, 1); as previous except: 20°12'N, 104°01'E, 1300-1900 m, 7.iv-25.v.2010, C. Holzschuh (NHMUK, 1). Louangnamtha, Namtha to Muang Sing, 21°09'N, 101°19'E, 900-1200 m, 5-31.v.1997, V. Kubáň (NHMB, 1). Oudomxai, Oudomxai, 17 km NE, 20°45'N, 102°09'E, ~ 1100 m, 1-9.v.2002, V. Kubáň (NHMB, 1).

Diagnosis.

2.5-2.7 mm long (mean = 2.62 mm; n = 5); 2.36-2.7 × as long as wide. This species is distinguished by the protibiae posterior faces flat, unarmed; antennal club as broad as tall; posterolateral carina oblique, granulate; elytral disc flat, without a transverse depression; elytral striae weakly impressed; elytral interstriae with two rows of granules and long semi-recumbent fine hair-like setae, setae 1-1.5 × width of an interstria.

Similar species.

Arixyleborus puberulus , A. scabripennis , A. setosus .

Distribution.

Bhutan*, India (Meghalaya, West Bengal), Laos*, Nepal.

Host plants.

Recorded only from Quercus lamellosa ( Fagaceae ) ( Beeson 1930).

Figures

Figure 27. Dorsal, lateral and declivital view of Arixyleborus minor, 1.2 - 1.4 mm (A, B, I), A. moestus paratype, 2.5 - 2.7 mm (C, D, J), A. nudulus holotype, 1.5 - 1.8 mm (E, F, K), and A. phiaoacensis holotype, 2.2 mm (G, H, L).