17. Amasa glabra (Eggers) * Xyleborus glaber Eggers, 1930: 185. Amasa glaber [sic] (Eggers): Wood, 1989: 169. Thai distribution: N: Chiang Mai. New to Thailand. New records: Chiang Mai, Chiang Mai University, 300 m, EtOH trap, 13.xii.2005 – 2.i.2006 (W. Puranasakul) (1); Khun Khan NP, vii.2005 (J. Hulcr et al.) (1). Other distribution: India (Assam), Indonesia (Java), Malaysia (W.). (4) Taxonomy: Wood (1989) considered A.glabra to be a synonym of Amasa schlichii (Stebbing), but we prefer to retain it for the present as a separate species. A. glabra can be distinguished from A. schlichii by the following characters (A. glabra characters listed first): Pronotal disc reticulate between punctures dorsally, appearing rather dull vs pronotal disc smooth and shining between punctures dorsally; elytral disc with strong, rather coarse strial punctures, interstrial punctures a little smaller vs elytral disc with smaller strial punctures, approximately equal in size to the interstrial punctures of A. glabra, the interstrial punctures much finer; upper part of elytral declivity weakly impressed, sutural interstriae gradually and weakly raised from near upper margin to apex, bearing an irregular double row of small tubercles vs upper part of elytral declivity strongly impressed, sutural interstriae strongly raised in apical half, with larger tubercles than A. glabra, usually in a single row. Further studies of this group of species need to be made. Biology: Recorded from Dryobalanops longifolia (Dipterocarpaceae) in Malaysia (Schedl 1971).

Published as part of Beaver, R. A., Sittichaya, W. & Liu, L-Y., 2014, A Synopsis of the Scolytine Ambrosia Beetles of Thailand (Coleoptera: Curculionidae: Scolytinae), pp. 1-82 in Zootaxa 3875 (1) on pages 20-21, DOI: 10.11646/zootaxa.3875.1.1, http://zenodo.org/record/5130589