Tricosa indochinensis, 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 : 549

Tricosa indochinensis sp. n.

( Figs 23–26 )

Diagnosis: 3.20–3.40 mm long (mean = 3.32 mm; n = 5); 2.83–2.91 times as long as wide. This species is distinguished by the discal interstrial punctures confused, protibia distinctly triangular, anterior margin of the pronotum with a clear row of eight moderate serrations. This species is very similar to C. cattienensis and can be distinguished by the larger size and narrower form.

Type material: Holotype, female: CHINA: Yunnan, Mengyang , 950 m, 2.v1962, Shimei Song (NMNH) . Paratypes, female: CHINA: Yunnan, Mengyang , 950 m, 2.v1962, Shimei Song (NMNH, 1; IZAS, 1) . INDIA: Bengal, Kalimpong, Samsingh , 1800’, I.1934, Mohan Lall, ex unknown wood ( NMNH, 3) . THAILAND: Chiang Mai, Doi Pui , 28°50’23”N, 98°53’53”E, 1200-1300 m, ex Pterocarpus sp. coll. ix.2014, S. Sanguansub et al. ( RABC, 1) .

Description (Female): 3.20–3.40 mm long (mean = 3.32 mm; n = 5); 2.83–2.91 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: 1.25 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 eight serrations.

Elytra. As described for genus except: 1.6 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.

Male: Unknown.

Etymology: In reference to the species occurrence in Southeast Asia.

Distribution: China (Yunnan), India (Bengal), Thailand.

Host plants: Known only from Pterocarpus (Fabaceae) .

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).