Amasa schlichii (Stebbing, 1907)

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

Amasa schlichii (Stebbing, 1907) Fig. 9G, H, L

Acanthotomicus truncatus Stebbing, 1907: 40.

Xyleborus schlichii Stebbing, 1914: 592 (new name for Xyleborus (Acanthotomicus) truncatus (Stebbing, 1907) nec Erichson 1842).

Amasa schlichi [sic] (Stebbing): Wood 1989: 169.

Xyleborus glaber Eggers, 1930: 185. Synonymy: Wood 1989: 169.

Xyleborus uniseriatus Eggers, 1936b: 89. Synonymy: Schedl 1963b: 268.

Xyleborus verax Schedl, 1939b: 43. Synonymy: Kalshoven 1959a: 95.

Type material.

Holotype, Xyleborus glaber (FRI), paratype (NHMW, 1). Syntype Xyleborus schlichii (FRI, 1).

New records.

China: Hong Kong, Tai Po Kau, vi.2017, J. Skelton (MSUC, 1). S-Yunnan, Xishuangbanna, Sanchahe Nat. Res., 22°09.784'N, 100°52.256'E, 2186 m, 29-30.v.2008, A.I. Cognato (MSUC, 2); as previous except: 23 km NW Jinghong, vic. Na Ban village (NNNR), 22°10'N, 100°39'E, 700-1000 m, v-vii. 2009, L. Meng (RABC, 2). Japan: Okinawa Pref., Iriomote-jima Island, 26.vi.2016, H. Kajimura, ex Machilus thunbergii (MSUC, 1). Vietnam: Cao Bang, 22°33.9981'N, 105°52.591'E, 1051 m, 12-17.iv.2014, VN11, Cognato, Smith, Pham, ex FIT (MSUC, 3). N. Ninh Binh, 90 km SW Hanoi, Cuc Phuong N.P., primate rescue centre, 20°14'24"N, 105°42'53"E, 190 m, 25.iv.2012, A. Weigel, ex light trap (NKME, 1). Thua Thien-Hue, Bach Ma N.P., 16.22897, 107.85349, 415 m, 15.ii.2017, VN61, A.I. Cognato, T.A. Hoang, ex 5 cm diameter branch (MSUC, 1).

Diagnosis.

2.9-3.5 mm long (mean = 3.21 mm; n = 10); 2.23-2.54 × as long as wide. This species is distinguished by the pronotum appearing basic (type 2) when viewed dorsally, anterior margin serrate; declivital surface shagreened to opalescent, dull, opaque; declivity glabrous; and declivital interstriae 1 granulate (typically near apex), interstriae 2 and 3 unarmed.

Similar species.

Amasa cycloxyster , A. galeoderma , A. resecta , A. versicolor , A. youlii .

Distribution.

China* (Hong Kong, Yunnan), India (Assam, West Bengal), Indonesia (Java), Japan*, East & West Malaysia, Thailand, Vietnam*.

Host plants.

Apparently polyphagous ( Beeson 1961; Beaver and Browne 1979; Maiti and Saha 2004).

Remarks.

This species had previously been considered to be extremely morphologically variable ( Hulcr and Cognato 2013) but Cognato et al. (2020b) and Smith et al. (2020) demonstrated that very little intraspecific morphological variation is present and removed the Papua New Guinean species A. striatotruncata (Schedl, 1936) and A. umbratula (Schedl, 1975) from synonymy.

Wood (1989: 169) considered Xyleborus glaber to be a synonym of X. schlichii . Beaver et al. (2014: 20) later considered it to be a distinct species. Upon our examination of the photos of the holotype and a paratype specimen we found this species to be conspecific with Amasa schlichii and it is here returned to synonymy.

Figures

Figure 9. Dorsal, lateral and declivital view of Amasa lini holotype, 3.5 mm (A, B, I), A. opalescens lectotype, 4.5 - 4.8 mm (C, D, J), A. resecta, 2.85 - 3.2 mm (E, F, K), and A. schlichii, 2.9 - 3.5 mm (G, H, L).