Acicnemis sauteri Hubenthal, 1919

Figs 1, 6O 1–6, 2, 26

Type material examined

(Japan: 21; Taiwan: 18; Total: 39). Lectotype (designated here). Taiwan • Hoozan, 1910, H. Sauter, bears a red label reading “ Typus ” and a new, red lectotype label reading “ LECTOTYPE / Acicnemis sauteri / Hubenthal, 1919 / Det. Lewis & Kojima, 2025 ”, SNSD, JHL_ACITAI_004 . Paralectotypes. Taiwan • Hoozan, “ 08–10 ”, Sauter (3, SDEI), bear a red label reading “ Syntypus ”, SDEI Muncheberg Col 18573, 18574, 18583 ; • Kosempo, Sauter (4, SDEI), bear a red label reading “ Syntypus ”, SDEI Muncheberg Col 18575, 18576, 18577, 18578 ; • Fuhosho, “ VIII- 09 ”, Sauter (3, SDEI), bear a red label reading “ Syntypus ”, SDEI Muncheberg Col 18580, 18581, 18582 ; • Taihorinsho, “ X- 09 ”, Sauter (1, SDEI), bears a red label reading “ Syntypus ”, SDEI Muncheberg Col 18579 .

Non-type material.

Taiwan • Lushan Wenchuan, Nantou Hsien, 6–7. VI. 1976, H. Makihara (2, KUM), JHL_AREV_609, JHL_AREV_611 ; • Sun Moon Lake, Nantou Hsien, 6. XII. 2013, J. Aoki (10, KUM), JHL_SYN_148 (dissected male), JHL_SYN_149 (dissected male), JHL_AREV_613 – JHL_AREV_620 ; • Wukongshan, Liu-kuei, Kaohsiung Hsein, 2. V. 1996, H. Takizawa (1, HUM), JHL_ACITAI_085 ; Japan: Kagoshima Prefecture: • Nakanoshima Island, 25–30. IV. 1975, H. Irie (1, KUM), JHL_AREV_608 ; • Jinushi-daimyojin, Satomura, Nakano-jima Island, 7–9. VII. 2019, S. Imada (1, KUM), JHL_AREV_610 ; • Sato, Nakano-jima Island, 7–9. VII. 2019, N. Tsuji (3, KUM), JHL_AREV_691 – JHL_AREV_693 ; • Aden, Kikai-jima Island, 6. V. 2022, R. Ito (3, KUM), JHL_AREV_623, JHL_AREV_908, JHL_AREV_909 ; • Kikai-jima Island, 4. III. 2012, J. Aoki (1, KUM), JHL_AREV_695 ; • Torigamine, Amami-Oshima, 3. VIII. 1976, N. Morishima (1, LBM), LBM 5123 ; • Hatsuno, Amami-Oshima, 24–30. VI. 1973, M. Ito (1 dissected male, LBM), LBM 5132 ; • Sumiyo, Amami Oshima, 27. V. 2004, K. Takahashi (1, KUM), JHL_AREV_694 ; • Akuseki-jima Island, Ue-shuraku, Sakamori-jinja, 2–6. VII. 2019, S. Imada (1, KUM), JHL_DNA_121 (GenBank accession number: PV 255642) ; • Nakano-jima Island, Satomura, Jinushi-daimyojin, 7–9. VII. 2019, S. Imada (1, KUM), JHL_DNA_120 (GenBank accession number: PV 255641) .

Diagnosis.

Body length 4.9–6.2 mm. Covered in pale and dark brown scales, with two obliquely shaped white, black-bordered spots across middle of elytra. Pronotum lacking impunctate longitudinal midline (present in A. koguma). Scutellum small, bordered by pale yellow scales, and weakly bare antero-dorsally (compare with A. kiotoensis which possesses a large, broad, bare scutellum). Odd and 2 nd elytral intervals with erect scales (4 th elytral interval also occasionally with 1–2 scales near white spot). Sclerolepidia indistinct, forming low, rounded, non-protruding tubercles. Third tarsomeres emarginate (as opposed to truncate, as in A. koguma). Pedon with lateral edges approx. parallel in dorsal view, but converging in distal 1 / 2 evenly into a blunt point. Pedon elongate (pedon length / total aedeagus length including temo = 0.26). Internal sac protruding and unmodified in the posterior 1 / 2, but with roughened musculature in anterior 1 / 2 (Fig. 6 O 1 – 2).

Distribution.

This species occurs in southern Japan (Kagoshima Prefecture) and Taiwan, and has also been recorded from South Korea (Alonso-Zarazaga et al. 2023). The apparent lack of this species in the southern Ryukyu Islands (Okinawa Prefecture) is odd; however, similar patterns are known in other weevils (e. g., Aphanerostethus magnus Lewis & Kojima, 2024)

Remarks.

This species is closely allied with A. maculaalba (see Remarks for that species). We designate one of Hubenthal’s syntypes (SNSD, JHL _ACITAI_004) as a lectotype to fix the identity of this species.