Tricosa cattienensis, Cognato & Smith & Beaver, 2020

Cognato, Anthony I., Smith, Sarah M. & Beaver, Roger A., 2020, Two new genera of Oriental xyleborine ambrosia beetles (Coleoptera, Curculionidae: Scolytinae), Zootaxa 4722 (6), pp. 540-554 : 548-549

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)

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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.

Figures

FIGURES 19–38. Lateral, dorsal, posterior oblique and anterior view of Tricosa cattienensis (19–22), T. indochinensis (23–26), T. jacula (27–30), T. mangoense (31–34), T. metacuneola (35–38).