Two new genera of Oriental xyleborine ambrosia beetles (Coleoptera, Curculionidae: Scolytinae) Author Cognato, Anthony I. Author Smith, Sarah M. Author Beaver, Roger A. text Zootaxa 2020 2020-01-17 4722 6 540 554 journal article 24312 10.11646/zootaxa.4722.6.2 fcb90f8f-1c93-4d87-a223-599264ed5642 1175-5326 3610918 4ADBCE90-97D2-4A34-BCDC-5E207D8EDF0D 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.