Tricosa jacula, 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 : 549-550

Tricosa jacula sp. n.

( Figs 27–30 )

Diagnosis: 3.20 mm long (n = 1); 2.91 times as long as wide. This species can be distinguished by the elytral discal striae and interstriae clearly uniseriate punctate, anterior margin of the pronotum unarmed, and protibia distinctly triangular.

Type material: Holotype, female: CHINA: Guizhou, Guiyang, Huaxi , 20.x.2015, Y. Li, ex poplar ( IZAS).

Description (Female): Female. 3.20 mm long (n = 1); 2.91 times as long as wide. Body sparsely setose; color ferruginous. Appearing moderately slender, elytra attenuate. Mycangial tufts absent.

Head. As described for genus.

Pronotum. As described for genus except: 1.06 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), without a row of serrations.

Elytra. As described for genus except: 2.0 times as long as wide. Discal interstriae punctures uniseriate.

Legs. As described for genus except: protibiae distinctly triangular with 6 large denticles present on outer margin of apical third.

Male: Unknown.

Etymology: L. jacula = dart. In reference to the attenuate elytral apex.

Distribution: China (Guizhou).

Host plants: Known only from Populus (Salicaceae) .

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).