Siemssenius tsoui Lee, sp. nov.

Siemssenius tsoui Lee, sp. nov.

(Figs 10 A–10F)

Type locality. New Taipei city, Hsinhsien (信賢), 24°50’02”N, 121°31’32”E, 200 m.

Type material (n= 9). Holotype ♂ (TARI): Taipei: Hsinhsien (信賢), 7.V.2011, leg. M.- H. Tsou. Paratypes: 2♂♂, 2♀♀ (TARI), same as holotype; 1♀ (TARI), Erhzuping (二子坪), 29.IV.2016, leg. C.- F. Lee; 2♂♂, 1♀ (TARI), Tsaikungkengshan (菜公坑山), 2.V.2012, leg. S.- F. Yu

Description. Aedeagus concave and narrow, sides basally and gradually widened; apico-lateral angles angulate, extremely wide in lateral view, bases of apico-lateral angles sharply arcuate; middle of apical margin with a long, slender tube-like process, extremely wide in lateral view, apex slightly medially depressed; dorsal process subapically slightly swollen in dorsal and lateral views, apex pointed, subapically angulate in lateral view (Figs 10 A–10B). Ventrite V (Fig. 10 C) not modified in female, apical margin narrowly rounded, sometimes medially depressed. Gonocoxae reduced. Ventrite VIII (Fig. 10 D) heart-shaped, with extremely short spiculum and dense elongate setae along apical margins of triangulate processes. Tergite VIII (Fig. 10 E) with apex pointed and dense setae on disc. Receptacle of spermatheca (Fig. 10 F) weakly swollen, barely separated from pump, pump much narrower and longer, sharply curved; proximal spermathecal duct long and narrow.

Diagnosis. Siemssenius tsoui sp. nov. is characterized its sharply arcuate bases of the apical-lateral angles of the aedeagus (Figs 10 A–10B).

Host plants. Lonicera hypoglauca Miq., 1866 (Caprifoliaceae) (Figs 3 D, 3E); Hydrangea angustipetala Hayata, 1911 (Saxifragaceae) (Fig. 3 F).

Etymology. This new species is named after Mr. Mei-Hua Tsou, a member of the TCRT and first to collect this new species.

Distribution. Lowlands in northern Taiwan (Taipei county and city) (Fig. 4).