New species and new records of Amasa Lea, 1894 ambrosia beetles from Thailand (Coleoptera: Curculionidae: Scolytinae: Xyleborini) Author Sittichaya, Wisut Agricultural Innovation and Management Division, Faculty of Natural Resources, Prince of Songkla University, Songkhla, 90110, Thailand Author Smith, Sarah M. 0000-0002-5173-3736 Department of Entomology, Michigan State University, 288 Farm Lane, 243 Natural Science Bldg., East Lansing, MI 48824, USA smith 462 @ msu. edu; https: // orcid. org / 0000 - 0002 - 5173 - 3736 smith462@msu.edu text Zootaxa 2022 2022-10-19 5196 2 197 210 journal article 169975 10.11646/zootaxa.5196.2.2 96e1a27d-a189-4ed0-97e0-c02192b3828d 1175-5326 7224439 8107F44A-C50A-43BB-9D28-0E990E8AA0FC Amasa Lea, 1894 Amasa Lea, 1894: 322 . Pseudoxyleborus Eggers, 1930: 206 . Wood 1984: 223 . Anaxyleborus Wood, 1980: 90 . Wood 1983: 647 . Type species. Amasa thoracica Lea, 1894 = Tomicus truncatus Erichson, 1842 Diagnosis. Length 1.9−5.4 mm , 1.8−3.4× as long as wide. Amasa are distinguished by the truncate declivity, margined with a circumdeclivital ring; declivital face with three striae; antennal club flattened, typically type 4 with club sutures sinuate, two sutures visible on posterior face or rarely without sutures, type 5; protibiae typically slender, inflated and granulate on posterior face (rarely distinctly triangular or unarmed); anterior margin of pronotum with a row of serrations; scutellum flat, flush with elytral surface; procoxae contiguous or narrowly separated, rarely moderately separated; mycangial tufts absent; eyes deeply emarginate or rarely completely divided. Similar genera: Xylosandrus Reitter , Cyclorhipidion Hagedorn , Pseudowebbia Browne , Truncaudum Hulcr & Cognato , and Webbia Hopkins.