Cyclorhipidion inarmatum (Eggers, 1923)

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

Cyclorhipidion inarmatum (Eggers, 1923) Fig. 42A, B, I

Xyleborus inarmatus Eggers, 1923: 209.

Cyclorhipidion inarmatum (Eggers): Beaver et al. 2014: 39.

Xyleborus vagans Schedl, 1977: 504. syn. nov.

Type material.

Lectotype Xyleborus inarmatus (NMNH). Holotype Xyleborus vagans (NHMW).

New records.

Bhutan: Thimpu, km 125 Phuntsholing, 2300 m, 24.v.1972, Nat.-Hist. Mus Basel, Bhutan Expedition (NHMB, 1) [misdetermined by Schedl as Xyleborus corporaali Eggers]. China: Yunnan, Lijiang, v.1975, Zhizhong Zhang, ex Pistacia weinmannifolia (NMNH, 1). Laos: NE, Houa Phan, Ban Saluei - Phou Pane Mt., 20°12-13.5'N, 103°59.5-104°01'E, 1340-1780 m, 15.iv-15.v.2008, Lao collectors (MNHP, 1).

Diagnosis.

2.8-3.0 mm long (mean = 2.9 mm; n = 3); 2.8-3.0 × as long as wide. This species is distinguished by the short, steep declivity that is approximately 25% of total elytral length, armed with large tubercles on interstriae 1 and 3, interstriae 2 always unarmed; posterolateral margins rounded; and declivital interstriae 1 setae in two confused rows, interstriae 2 setae uniseriate (Table 1 ).

Similar species.

This species is a part of a challenging species group consisting of C. bodoanum , C. distinguendum , C. pelliculosum , C. tenuigraphum and C. xeniolum (Table 1 ).

Distribution.

Bhutan*, China* (Yunnan), India (Himachal Pradesh, West Bengal), Indonesia (Sumatra), Laos*, Myanmar, Thailand, Vietnam.

Host plants.

Recorded from Castanopsis and Quercus ( Fagaceae ), and probably with a close association with Fagaceae ( Beaver et al. 2014).

Remarks.

The holotype of Xyleborus vagans was compared with the lectotype of X. inarmatum and was found to be conspecific. Xyleborus vagans is slightly smaller than X. inarmatum but the specimens are identical in every other way. The specimens were found to be conspecific and X. vagans is here placed in synonymy.

Figures

Figure 42. Dorsal, lateral and declivital view of Cyclorhipidion inarmatum lectotype, 2.8 - 3.0 mm (A, B, I), C. japonicum, 2.1 - 2.3 mm (C, D, J), C. miyazakiense, 2.6 - 3.0 mm (E, F, K), C. muticum holotype, 4.0 mm (G, H, L).