Xyleborinus subgranulatus (Eggers, 1930) Fig. 86C, D, J

Xyleborus subgranulatus Eggers, 1930: 202.

Xyleborinus subgranulatus (Eggers): Wood and Bright 1992: 817.

Type material.

Holotype (FRI), paratype (NMNH).

New records.

China: Yunnan, Gaoligong Mts., 25.22N, 98.49E, 1500-2500 m, 17-24.v.1995, V. Kubáň (NKME, 1); S Yunnan, Xishuangbanna, 29 km NW Jinghong, vic. Da Nuo You NNNR, 22°12.41'N, 100°38.29'E, 790 m, fallow GF, 23.v.2008, A. Weigel (RABC, 1); as previous except: 37 km NW Jinghong, vic. Guo Men Shan, 22°14.48'N, 100°36.22'E, 1080 m, forest, EKL, 16.iii.2009, L. Meng (NKME, 1). Laos: NE, Houa Phan, Phou Pane mt., 20°13'09-19"N, 103°59'54"-104°00'03"E, 1480-1510 m, 22.iv-14.v.2008, V. Kubáň (MNHP, 1). Taiwan: Yilan co., Fushan, v.2009, ex sticky trap (RABC, 1). Vietnam: Cao Bang, 22°34.118'N, 105°52.537'E, 1048 m, 12.iv.2014, VN13, Cognato, Smith, Pham, ex large felled Pinus sp. (MSUC, 1). Vinh Phuc, Tam Dao, 6-9.v.1990, P. Pachlolátko (RABC, 1). Tuyen Quang, 3 km SE Pac Ban village, Na Hang Nature Reserve, 22.20; 105.25, 380 m, at light, 22-26.ii.1997, G. Csorba (HNHM, 1).

Diagnosis.

1.6-1.8 mm long (mean = 1.7 mm; n = 5); 3.0-3.4 × as long as wide. This species is distinguished by the declivital face with interstriae 2 armed by granules at declivital summit, unarmed on declivital face; declivital interstriae 1 and 3 denticles subacutely pointed; denticles on ventrolateral areas of the elytra small, less acute; declivital interstriae 2 slightly impressed; discal interstriae 1 and 2 granulate, granules extending from declivital summit to mid-point of disc; and minute size.

Similar species.

Xyleborinus attenuatus, X. saxesenii, X. subspinosus, X. thaiphami .

Distribution.

China* (Yunnan), India (Assam, West Bengal), Laos*, Taiwan*, Thailand, Vietnam*,

Host plants.

Recorded from four genera in four different families (Maiti and Saha 2004) as well as Pinus ( Pinaceae) and is presumably polyphagous.

Remarks.

This species is strikingly similar to, and has been recovered as, sister to Xyleborinus saxesenii using COI data (Cognato et al. 2020b) but the elytral morphology is inconsistent within single specimens. Given its close relationship with X. saxesenii the species is expected to have denticles along declivital interstriae 1 and 3. However this is not always the case and the species can also have declivital interstriae 1 and 2 unarmed with denticles along interstriae 3. Both tubercle patterns have been found on each elytron of single individuals, including the paratype examined and individuals from a series collected in [West] Bengal.