A monograph of the Xyleborini (Coleoptera, Curculionidae, Scolytinae) of the Indochinese Peninsula (except Malaysia) and China Author Smith, Sarah M. Department of Entomology, Michigan State University, 288 Farm Lane, East Lansing, Michigan 48824, USA https://orcid.org/0000-0002-5173-3736 camptocerus@gmail.com Author Beaver, Roger A. 161 / 2 Mu 5, Soi Wat Pranon, T. Donkaew, A. Maerim, Chiangmai 50180, Thailand Author Cognato, Anthony I. Department of Entomology, Michigan State University, 288 Farm Lane, East Lansing, Michigan 48824, USA text ZooKeys 2020 983 1 442 http://dx.doi.org/10.3897/zookeys.983.52630 journal article http://dx.doi.org/10.3897/zookeys.983.52630 1313-2970-983-1 7DED4CE2934C4539945F758930C927F9 C890C7FD4B2D57A8B1A062305ED42D53 Anisandrus improbus (Sampson, 1913) Fig. 21E, F, K Xyleborus improbus Sampson, 1913: 444. Anisandrus improbus (Sampson): Hulcr et al. 2007 : 578. Type material. Holotype (NHMUK). Diagnosis. 3.3-3.4 mm long (mean = 3.4 mm; n = 2); 2.43-2.54 x as long as wide. This species is distinguished by the mesonotal mycangial tuft the length of the scutellum; elytral disc convex; declivity appearing flat when viewed laterally; declivital striae clearly impressed; declivital summit armed by a minute denticle on each interstriae 2 and 3; granules present on basal 1/2 of interstriae 2-4; declivital posterolateral margin costate to interstriae 7; declivital face strongly shiny; and declivital interstriae clearly punctate. Similar species. Anisandrus eggersi , A. feronia , A. mussooriensis . Distribution. China (Xizang), India (Assam, West Bengal). Host plants. Recorded from Quercus ( Fagaceae ), Machilus ( Lauraceae ), and Eucalyptus ( Myrtaceae ) ( Maiti and Saha 2004 ).