Parrhinotermes microdentiformisoides Thapa, 1981 (Figures 7A–F, 14B) Parrhinotermes microdentiformisoides Thapa, 1981: 106–108, pl.35. Material examined THAILAND: Surat Thani: three series, Khao Sok National Park, 400 m alt., 5 November 2002, Y. Takematsu coll. Redescription Soldier. Head capsule pale yellow; antennae pale yellow; labrum pale brownish yellow; mandibles brown, paler basally. Thoracic nota pale yellow; legs and abdomen pale yellow. Head sparsely hairy; labrum with several hairs on the anterior half and many minute hairs along the anterior margin; pronotum with a few hairs on the surface and many hairs along margin. Postmentum with scattered hairs. Head capsule subrectangular, widest at posterior third, longer than wide, mHW / HL 0.86–0.91 (0.88). Fontanelle small, circular. Eyes absent. Antennae with 13 segments; third segment much longer than second and fourth. Labrum broadly rounded. Mandibles broad basally, strongly incurved, inner margin of bases finely serrated, mandibles half the length of the head, LML / HL 0.49–0.52 (0.50); left mandible strongly bent in middle, with two broadly triangular marginal teeth, first marginal tooth located at middle, much bigger than second; right mandible with a marginal tooth in the middle, not pointed, posterior cutting edge strongly concave. Postmentum almost three times as long as the maximum width; widest almost at the anterior third; narrowest at the posterior third. Pronotum flat, with anterior margin slightly convex, notched in middle. Mesonotum slightly narrower than pronotum. Metanotum almost as wide as pronotum. Measurements (mm) Ten soldiers from three series: HL, 1.08–1.20 (1.15) mHW, 0.98–1.07 (1.01); LML, 0.58–0.60 (0.58); PL, 0.30–0.32 (0.31); PW, 0.58–0.61 (0.59); PosL, 0.85–0.90 (0.87); PosW, 0.29–0.32 (0.31). Distribution Thailand (South), Borneo. New record for Thailand. Remarks This species was collected only from Khao Sok, south of the Kra Isthmus. This species and Parrhinotermes microdentiformis Thapa, 1981 are similar and easily distinguished from the other species in the genus by having a marginal tooth on the right mandible with its posterior cutting edge strongly concave. But P. microdentiformisoides is distinctly smaller than P. microdentiformis.

Published as part of Takematsu, Yoko & Vongkaluang, Charunee, 2012, A taxonomic review of the Rhinotermitidae (Isoptera) of Thailand, pp. 1079-1109 in Journal of Natural History 46 (17 - 18) on pages 1091-1093, DOI: 10.1080/00222933.2011.651653, http://zenodo.org/record/5199813