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 cattienensis sp. n. ( Figs 19–22 ) Diagnosis : 2.70–3.10 mm long (mean = 2.98 mm ; n = 5); 2.50–2.70 times as long as wide. This species is distinguished by the discal interstrial punctures confused, protibia distinctly triangular, anterior margin of pronotum with a clear row of six moderate serrations. This species is very similar to C. indochinensis but can be distinguished by the smaller size and stouter form. Type material : Holotype , female : VIETNAM : Dong Nai prov. , Cat Tien NP, 11.42232 , 107.42834 , 128 m , 25.ii.2017 , VN103, A.I. Cognato , T.A. Hoang , ex 1–3 cm dia branch ( MSUC ) . Paratypes , female : CHINA : Hong Kong , Kadoorie Farm , vi.2016 , J. Skelton , P. Carlson , Y. Li , J. Hulcr ( IZAS , 1) . JAPAN : Okinawa Pref. , Iriomotejima Island , 20.ix.2016 , H. Kajimura , ex Machilus thunbergii ( MSUC , 1); as previous except Okinawa , Yona , 1.xi.2011 , J. Hulcr , ex Castanopsis , uffeID 7388 ( UFFE , 1) . THAILAND : Chiang Mai , Doi Suthep , 7.viii.2002 , R.A. Beaver , K. Koivisto ( RABC , 1); Phetchaburi , Kaeng Krachan NP, Ban Krang , ex Pterocarpus macrocar- pus , x.2017 , S. Sanguansub ( RABC , 1); Surat Thani , Ratchaprapa Reservoir , ex cut liana, 24.ii.2012 , R.A. Beaver ( RABC , 1) . Description (Female) : 2.70–3.10 mm long (mean = 2.98 mm ; n = 5); 2.50–2.70 times as long as wide. Body densely setose; color ferruginous; appearing moderately slender, elytra attenuate. Mycangial tufts absent. Head. As described for genus. Pronotum. As described for genus except: 1.05 times as long as wide. Pronotum from lateral view with disc as long as anterior slope ( type 7, Hulcr et al . 2007 ). In dorsal view, elongate, parallel-sided, anterior margin rounded ( type 7; Hulcr et al. 2007 ), with a row of six serrations. Elytra . As described for genus except: 1.71 times as long as wide. Discal interstriae punctures confused. Legs . As described for genus except: protibiae distinctly triangular with 6 large denticles present on outer margin of apical third. Etymology : In reference to the type locality, Cat Tien National Park, Vietnam . Distribution : China ( Hong Kong ), Japan , Thailand , Vietnam . Host plants : Known only from Pterocarpus (Fabaceae) , Castanopsis (Fagaceae) , Machilus (Lauraceae) , and an unknown cut liana.