Argopistes tsoui sp. nov.

Figs 11 C, D, 13, 14 A, B

Type material examined.

Holotype • ♂ (TARI). Taiwan. Hsinchu: Tahunshan (大混山), 24. II. 2009, leg. S. - F. Yu. • Paratypes • 1 ♂, 1 ♀ (TARI), same as holotype; • 1 ♀ (TARI), same but with “ 8. IX. 2009 ”; Ilan: • 3 ♂, 3 ♀ (TARI), Fushan (福山) Chihwuyan (植物園 = Botanic Park), 15. II. 2009, leg. M. - H. Tsou ; • 4 ♂, 6 ♀ (TARI), same locality, 8. VI. 2023, leg. S. - S. Lu; • 1 ♂ (TAFI), same but with “ 27. XI. 2023 ”; • 1 ♀ (TAFI), same but with “ 28. XI. 2023 ”; • 1 ♂, 1 ♀ (TAFI), same but with “ 29. XI. 2023 ”; • 1 ♂, 1 ♀ (TARI), same but with “ 5. XII. 2023 ”; • 1 ♀ (TARI), same but with “ 7. XII. 2023 ”; • 1 ♀ (TARI), same but with “ 18. XII. 2023 ”; • 1 ♂ (TARI), same but with “ 11. I. 2024 ”; • 1 ♂ (TARI), same but with “ 8. III. 2024 ”; • 4 ♂, 3 ♀ (TARI), same but with “ 7. V. 2024 ”; Keelung: • 1 ♂, 1 ♀ (TARI), Hungtanshan (紅淡山), 10. V. 2008, leg. M. - H. Tsou; Pingtung: • 1 ♀ (TARI), Lilungshan (里龍山), 5. XI. 2009, leg. M. - H. Tsou ; • 1 ♀ (TARI), Tahanshan (大漢山), 22. I. 2009, leg. S. - F. Yu ; • 1 ♀ (TARI), same locality, 20. VIII. 2022, leg. Y. - T. Chung; Taoyuan: • 2 ♂ (TARI), Tungyanshan (東眼山), 8. VII. 2007, leg. M. - H. Tsou ; • 1 ♀ (TARI), Yongfu (永福), 24. III. 2014, leg. H. Lee.

Diagnosis.

Adults of A. tsoui sp. nov. are similar to those of A. biplagiatus with reddish-brown elytra with wide black lateral margins, but differ from A. biplagiatus by the reddish-brown pronotum with wide black lateral margins (entirely black pronotum in A. biplagiatus). Diagnostic genitalic characters include pointed apex of aedeagus similar (Fig. 13 C) to that of A. biplagiatus (Fig. 3 C) but relatively narrower in lateral view (Fig. 13 D) (relatively wider (Fig. 3 D) in A. biplagiatus), longer, longitudinal paired sclerites of tectum (Fig. 13 C) (short, curved paired sclerites of tectum (Fig. 3 C) in A. biplagiatus), anterior opening from apical 1 / 10 to middle (Fig. 13 C) (anterior opening from apex to apical 3 / 10 (Fig. 3 C) in A. biplagiatus); triangular gonocoxae similar to those of A. rufus but expanding inwardly at basal 1 / 3 (Fig. 13 G) (expanding outward at basal 1 / 3 (Fig. 6 G) in A. rufus); dense setae along apical margin of abdominal ventrite VIII similar to those of A. biplagiatus but much denser and shorter (Fig. 13 C) (less denser and longer setae on apical margin of abdominal ventrite VIII (Fig. 3 E) in A. biplagiatus).

Description.

Length 3.9–4.3 mm, width 3.2–3.5 mm. Color (Fig. 11 C – E) reddish brown, sides of pronotum and elytra darker, tarsi and antennae yellow. Pronotum broad, convex, lateral margin narrowly explanate; 2.2 × wider than long, disc with dense coarse punctures; lateral margin rounded, anterior margin strongly concave, posterior margin moderately convex. Elytra broadly oval, 1.0–1.1 × longer than wide, disc with dense, confused, coarse punctures.

Male. Antenna filiform (Fig. 13 A), antennomere I much longer than others, approximate ratios of length of antennomeres I – XI 1.0: 0.4: 0.3: 0.4: 0.4: 0.4: 0.4: 0.4: 0.4: 0.4: 0.6; approximate ratios of length to width of antennomeres I – XI 4.7: 2.1: 2.2: 2.4: 2.0: 2.0: 1.9: 1.9: 1.9: 1.7: 2.7. Aedeagus (Fig. 13 B, C) strongly narrowed from apical 1 / 5 to apex, apex pointed; anterior opening small, ~ 0.35 as long as aedeagus, from apical 1 / 10 to middle; tectum composed of one pair of sclerotized processes with bifurcate apices, outer apex hooked, large, ~ 1.1 as long as anterior opening; narrow and slightly curved in lateral view; endophallic sclerite laterally flattened, with small process near apex, and with basal processes membranous.

Female. Antenna (Fig. 13 B) similar to males, ratios of length of antennomeres I – XI 1.0: 0.4: 0.3: 0.4: 0.4: 0.3: 0.4: 0.4: 0.4: 0.4: 0.5; ratios of length to width of antennomeres III – XI 4.1: 2.2: 2.4: 2.4: 2.2: 1.9: 2.1: 2.0: 1.9: 1.8: 2.9. Ventrite VIII (Fig. 13 E) membranous, only apical margin sclerotized, T-shaped, with dense short setae along apical margin, spiculum long. Spermathecal receptaculum (Fig. 13 F) longer than pump, moderately swollen, curved in lateral view; pump emarginate at inner side of base; spermathecal duct with elongate basal part, ramus rounded. Gonocoxae (Fig. 13 G) wide and separated, base membranous, each gonocoxa asymmetric, apically narrowed from apical 1 / 3, with dense long setae along apical areas.

Host plant.

Oleaceae: Osmanthus heterophyllus (Fig. 13 A, B), O. kaoi (T. S. Liu & J. C. Liao) S. Y. Lu, O. enervius Masam. & T. Mori, O. fragrans .

Biology.

This species seems to be univoltine. The larvae were found only during late March.

Etymology.

This new species is named for Mei-Hua Tsou (曹美華), the first person to collect specimens.

Distribution.

This new species is widespread in lowlands of Taiwan (Fig. 5).