Bucsekatha sunda Volynkin & Černý, 2025, sp. n.

Bucsekatha sunda sp. n. https://zoobank.org/ urn:lsid:zoobank.org:act: 1395EB03-0D23-4A2D-9817-F30C0FC6F891 (Figs 24–27, 67–69, 99, 100) Katha brevivalva (Holloway, 2001): Bucsek (2012): 122, Pl. 21: figs 305a, 305b, gen. figs Mal165, Mal167. Type material. Holotype (Figs 24, 67): male, “SW Thailand | Ranong-prov. Ranong, 380m | 10°01'32''N, 98°40'13'' E | 17, 20.XI.2006 leg. K.Cerný ” / “Slide | AV9177 ♂ | A. Volynkin ” (MWM / ZSM, ex CKC). Paratypes. THAILAND: 6 males, 1 female, Ranong Prov., Ranong, 380m, 10°01'32''N 98°40'13''E, 3–4.XII.2005, K. Černý leg., gen. slide Nos: AV8286 ♂, AV9150 ♀ (CKC); 1 female, same data as previous but ex ovo 2006, gen. slide No.: AV9172 ♀ (CKC); 1 male, Ranong, 543m, 10°02'01'N 98°40'17.66''E, 7.IV.2013, K. Černý leg., gen. slide No.: AV8281 ♂ (CKC); 1 female, Surat Thani Prov., Khao Sok NP, 199m, 8°53'23''N 98°30'25''E, 6.XII.2005, K. Černý leg., gen. slide No.: AV9153 ♀ (CKC); 3males, Nakhon Si Tammarat [Prov.], Amphoe Ron Pibun, | Ang Ka Tai Hill, 900–950m, 8°14.16'N 99°48.12'E, 9–10.IV.2013, K. Černý leg., gen. slide No.: AV8280 ♂ (CKC); 1 male, Chumphon Prov., Pa Toh Ditr., Ban Lang Tang, 162m, 7.XII.2005, 9°46'5''N 98°46'59''E, K. Černý leg., gen. slide No.: AV8282 ♂ (CKC); MALAYSIA: 2 males, 1 female, Perak, 50 km NE of Gerik (aerial path), Belum-Temenggor: Titiwangsa, 5°36'17.4''N 101°32'34.0''E, 30.iii–13.iv.2015, 1100m, E. Jendek & O. Šauša leg., gen. slide Nos: ZSM Arct. 2021 - 518♂, 2021- 595♀, 2021- 599♂ (prepared by A. Volynkin) (MWM / ZSM); INDONESIA: 1 male, 1 female, N Sumatra, 15 km NE of Prapat, HW 4, 1150m, 3–6.I.1994, Karel Černý leg., gen. slide Nos: AV8274 ♂, AV9185 ♀ (CKC); 1 female, N Sumatra, Simalungun, Prapat, HW 3, 9.II.1984, Dr Diehl leg., gen. slide No.: AV9484 ♀ (CKC); 1 male, Sumatra, Aek Tarum, Gunung Malayu, 8.V.1983, Dr Diehl leg., gen. slide No.: AV9491 ♂ (CKC); 1 male, Sumatra, Bandar Lampung, Bukit Rigis Mts, Gunung Terang, 1022m, 5°3'43''S 104°27'6''E, 13– 15.XI.2003, [K.] Černý leg., gen. slide No.: AV9176 ♂ (CKC); 1 female, W Sumatra, 22 km E of Padang, Bukit Subang, microwave stat.[ion], 0°40'S 100°32'E, montane forest, 1200m, 19–20.X.1981, A. Schintlmeister et al. leg., gen. slide No.: AV9184 ♀ (CKC); 1 male, South Sumatra, Lake Ranau env., 800m, 4°507'38''S 104°3'[00'']E, 17.XI.2003, K. Černý leg. (CKC). Note. The population from the Malay Peninsula lacks the small medial diverticulum, which is present in the specimens from Sumatra. However, the taxonomic value of this feature is unclear and, as no other morphological differences were found between the specimens from the two populations, they are herein considered as belonging to the same biological species. Diagnosis. The forewing length is 11.5–13.0 mm in males and 14.0 mm in females. The male genital capsule of B. sunda sp. n. differs from B. chonga sp. n. and B. pseudobrevivalva in the longer distal saccular process and the shorter, narrower and more weakly sclerotised lobes of the caulis. The phallus of B. sunda sp. n. differs from the similar species in the markedly smaller carinal process. The vesica structure of B. sunda sp. n. is most similar to B. chonga sp. n., from which the former differs in the larger medial cornutus. In the female genitalia, B. sunda sp. n. differs from other congeners in the markedly narrower ductus bursae. Distribution. The new species is found on the Malay Peninsula (South Thailand and West Malaysia) and the island of Sumatra (Indonesia). Etymology. The specific epithet is derived from Sundaland, in the western part of which the new species is found. The name is a noun in the nominative singular.