Tricosa metacuneola (Eggers) comb. n.

(Figs 35–38)

Xyleborus metacuneolus Eggers, 1940: 150 .

Xyleborus kaimochii Nobuchi, 1981: 143 . Synonymy: Smith et al., 2018: 397.

Diagnosis: 2.40–2.50 mm long (mean = 2.46 mm; n = 5); 2.67–2.78 times as long as wide. This species is distinguished by elytral discal striae and interstriae clearly uniseriate punctate, anterior margin of pronotum with a row of serrations, and protibia obliquely triangular.

Material examined: Paratype Xyleborus metacuneolus, [INDONESIA] : Java, Buitenzorg, 15.x.1923 (NMNH, 1). [INDONESIA] : Java, Boger [sic] viii.1964, N.L.H. Krauss (NMNH, 4) . MALAYSIA: Sabah, Sipitang, Mendolong, 19.iv.1988, S. Adebratt (RABC, 1) . PAPUA NEW GUINEA: Madang, Ohu, J. Hulcr, ex Gymnacranthera paniculata (MSUC, 1) . SINGAPORE: Bukit Timah, 50m, 25‒27.x.1998, B. H. Jordal (RABC, 2) .

Distribution: Brunei, Indonesia (Java, Sulawesi), Japan, East & West Malaysia, New Guinea, Philippines, Singapore, Sri Lanka, Taiwan, Thailand.

Host plants: Probably polyphagous. Recorded from Buchanania, Mangifera (Anacardiaceae), Swietenia (Meliaceae), Castanopsis (Fagaceae) (Nobuchi 1981; Beaver & Liu 2010) and Gymnacranthera (Myrsticaceae) .

Remarks: The paratype from Indonesia (Java; NMNH) and two specimens from Singapore and Malaysia (Sabah; RABC) were all found to have different pronotal length/width ratios of 1.08, 1.23 and 0.88 respectively. It is unclear whether the species is morphologically variable or if this species may be a species complex. At the time of this study DNA data was only available for T. metacuneola s.s. Future research is necessary to determine species limits.