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 Xylosandrus adherescens Schedl, 1971 Fig. 92A, B, I Xylosandrus adherescens Schedl, 1971b: 375. Type material. Holotype (NHMW). New records. Vietnam: Dong Nai, Cat Tien N.P., 11.42854 , 107.42544 , 148 m, 23.ii.2017, VN98, A.I. Cognato, T.A. Hoang, ex 5 cm diameter (MSUC, 2). Diagnosis. 2.0 mm long (n = 3); 2.0 x as long as wide. This species is distinguished by its small size; elytral disc flat, gradually curving toward declivity, elytra rounded; posterolateral margins of elytra carinate to interstriae 7; declivital face with six punctate striae, striae setose, setae semi-recumbent and equal to the width of an interstria; interstriae denticulate-granulate, uniseriate with erect hair-like setae longer than the width of two interstriae; pronotum as long as wide, from dorsal view rounded (type 1) and lateral view basic (type 0), summit at midpoint, basal 1/2 smooth, shiny, sparsely minutely punctate; and sparse mycangial tuft on the pronotal base. Similar species. Xylosandrus compactus , X. derupteterminatus , X. mesuae , X. morigerus . Distribution. Vietnam. Host plants. Unknown. Remarks. The gallery of this species was flat and a cave type. It was excavated against the grain of the wood (AIC, pers. obs.). Figure 92. Dorsal, lateral and declivital view of Xylosandrus adherescens , 2.0 mm ( A, B, I ), X. amputatus , 2.8 mm ( C, D, J ), X. beesoni , 2.2-2.7 mm ( E, F, K ), and X. bellinsulanus holotype, 3.9 mm ( G, H, L ).