Siemssenius metallipennis (Chûjô)

(Figs 1 C–1D, 5A– 5I)

Pseudoliroetis metallipennis Chûjô, 1962: 181; Kimoto, 1969: 36 (additional records); Takizawa et al., 1995: 12; Kimoto & Chu, 1996: 70 (catalogue).

Siemssenius metallipennis: Kimoto & Takizawa, 1997: 181; Zhang et al., 2008: 127 (key).

Type locality. Chiayi county, Alishan (阿里山), 23°30’32”N, 120°48’07”E, 2200 m.

Type material (n= 2). Holotype ♂ (head and prothorax lost but glued back with those of Basilepta varians Chûjô, 1956; TARI), labeled: “ Arisan (= Alishan, 阿里山) / FORMOSA / 24–25.V.1933 / Col. M. CHUJO [p, w] / / Pseudoliroetis / metallipennis / CHÛJÔ [h] // DET M. CHUJO [p, w] // Ho / Type [p, w, circle label with red letters and border but faded out] // 2366 [p, w]”. Paratype: 1♀ (TARI), labeled: “Mt. ARI- SAN [h] / FORMOSA [p] / 7.VII.1929 [h] / COL. [p] M. CHÛJÔ [h, w] // Pseudoliroetis / metallipennis / CHÛJÔ [h] // DET M. CHUJO [p, w] / / ALLo / Type [p, w, circle label with gray letters and border] // 2365 [p, w]”.

Additional specimens (n= 19). Chiayi: 2♂♂ (TARI), Alishan (阿里山), 20–23.VI.1956, leg. S. C. Chiu; 2♀♀ (SEHU), same locality, 4–5.VII.1975, leg. H. Takizawa; 1♂, 4♀♀ (SEHU), same locality, 9–10.VII.1981, leg. H. Takizwa; Nantou: 4♂♂, 2♀♀ (TARI), Tatachia (塔塔加), 18.V.2010, leg. M.- H. Tsou; 1♀ (TARI), same locality, 10.V.2011, leg. C.- F. Lee; 1♀ (TARI), same locality, 9.VII.2014, leg. C.- F. Lee; 1♂, 1♀ (TARI), same locality, 1.VII.2015, leg. J.- C. Chen.

Description. Length 7.9–9.4 mm, width 4.1–5.5 mm. General color yellow, but head, scutellum, femora, tarsi, and apices of tibiae black, antennae apically paler; elytra greenish or purplish bronze (Figs 1 C–1D). Antenna filiform, relatively longer in male (Fig. 5 A), as long as body, antennomeres III–V apically widened, length ratios of antennomeres III to XI about 1.0: 1.3: 1.3: 1.4: 1.4: 1.3: 1.3: 1.3: 1.6, and length to width ratios of antennomeres III to XI about 2.5: 3.5: 3.5: 4.0: 4.2: 4.5: 4.6: 5.2: 7.7; relatively shorter in female (Fig. 5 B), about 0.9x as long as body, antennomeres III–V apically widened, length ratios of antennomeres III to XI 1.0: 1.1: 1.2: 1.0: 1.1: 1.1: 1.0: 1.0: 1.4, and length to width ratios of antennomeres III to XI 3.2: 3.6: 3.8: 3.6: 4.0: 4.2: 4.3: 4.4: 5.9. Apical margin of abdominal ventrite V with two well developed incisions in male, surface with deep, wide, longitudinal groove, apically expanding into most of area between incisions; apical margin of ventrite IV with very small incision midway (Fig. 5 E). Aedeagus concave and basally widened, weakly curved in lateral view; apico-lateral angles obtusely angulate, narrow in lateral view, base obtusely angulate; middle of apical margin with a long, broad tube-like process, wide in lateral view, apex with median notch; dorsal process subapically and strongly swollen in lateral view but weakly swollen in dorsal view, apex pointed and triangulate in lateral view (Figs 5 C–5D). Abdominal ventrite V not modified in female, apical margin truncate, disc without depression (Fig. 5 F); apical of margin of ventrite IV straight. Gonocoxae reduced. Ventrite VIII (Fig. 5 H) heartshaped, with short spiculum, with scarce elongate setae along apical margins of triangulate processes. Tergite VIII (Fig. 5 G) with apex rounded and dense setae on disc. Receptacle of spermatheca (Fig. 5 I) weakly swollen, barely separated from pump, pump much narrower and longer, sharply curved; proximal spermathecal duct long and narrow.

Diagnosis. See diagnosis of Siemssenius cheni sp. nov.

Host plant. Lonicera acuminata Wall., 1832 (Caprifoliaceae) (Figs 3 B–3C).

Distribution. Two localities at mountain areas in south Taiwan (Nantou and Chiayi counties) where it is sympatric with S. rufipennis (Chûjô, 1962) (Fig. 4).