Ambrosiophilus subnepotulus (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

Ambrosiophilus subnepotulus (Eggers, 1930) Fig. 15G, H, L

Xyleborus subnepotulus Eggers, 1930: 178.

Ambrosiodmus subnepotulus (Eggers): Wood and Bright 1992: 680.

Ambrosiophilus subnepotulus (Eggers): Beaver and Liu 2010: 22.

Xyleborus cristatuloides Schedl, 1971a: 284. syn. nov.

Type material.

Holotype Xyleborus subnepotulus (FRI). Lectotype Xyleborus cristatuloides (NHMW).

New records.

China: Guizhou, Guiyang, Huaxi, 31.iv.2015, Y. Li, ex in flight (UFFE, 9). Hong Kong, vi.2017, J. Skelton (MSUC, 15). Laos: Vientiane, Ban Van Eue, 31.xii.1965, native collector (BPBM, 2).

Diagnosis.

2.5-2.8 mm long (mean = 2.64 mm; n = 7); 2.27-2.6 × as long as wide. This species is distinguished by declivital interstriae 1 unarmed, interstriae 2 armed by one tubercle at declivital summit, remainder of interstriae 2 unarmed, interstriae 3 with two large tubercles; declivity weakly bisulcate from sutural margin to striae 2; interstriae 3 weakly convex; pronotal surface shiny, discal punctures minute, very fine, widely spaced by 2-6 diameters of a puncture; and declivital surface smooth, shiny; and moderate size.

Similar species.

Ambrosiophilus consimilis , A. cristatulus , A. indicus , A. osumiensis .

Distribution.

China* (Guizhou, Hong Kong*), Indonesia (Java), Laos*, Myanmar, Sri Lanka, Taiwan.

Host plants.

The only recorded host is Albizia lebbeck ( Fabaceae ) ( Beeson 1930).

Remarks.

Wood (1989) considered X. cristatuloides Schedl as a synonym of Ambrosiodmus asperatus . However, the lectotype has a punctate pronotal disc and declivital sculpturing that is almost identical with Ambrosiophilus subnepotulus and it is here placed in synonymy.

Figures

Figure 15. Dorsal, lateral and declivital view of Ambrosiophilus papilliferus holotype, 2.5 mm (A, B, I), A. satoi paratype, 2.5 - 2.75 mm (C, D, J), A. sexdentatus, 2.7 - 3.0 mm (E, F, K), and A. subnepotulus, 2.5 - 2.8 mm (G, H, L).