Scopaeus elegantulus Cameron, 1930

(Figs 18, 43, 95 – 97, 136, 170, 171)

Scopaeus elegantulu s Cameron, 1930: 346, 347.

Type specimens examined: Holotype ♂, Malaysia, Pahang: Raub; labeled ‘Type’ (red edged, round, printed label), ‘Raub / Pahang F.M.S. / Dr. Cameron’ (printed), ‘S. / elegantulus Cam. / TYPE’ (handwritten), ‘ M. Cameron / Bequest / B.M.1955-147.’ (printed), ‘ NHMUK014663052 ’ (printed with QR-code), ‘ Holotype / Scopaeus elegantulus / Cameron 1930 / label by J. Frisch, 2022 ’ (red, printed) (NHML). Paratypes: 4 ♂, labeled ‘Raub / Pahang F.M.S. / Dr. Cameron’ (printed), ‘ M. Cameron / Bequest / B.M.1955-147.’ (printed), ‘Paratype / Scopaeus elegantulus / Cameron 1930 / label by J. Frisch, 2022 ’ (subsequent paratype label, red, printed) (NHML).

Comment: In the original description of Scopaeus elegantulus, the number of underlying specimens is missing, but Cameron (1930: 347) wrote the type was from Raub and labeled it as the ‘type’. Thus, the specimen is a holotype by original designation (ICZN 1999: Article 73.1.1.). In the same paper, Cameron (1930) several times termed holotypes by monotypy (ICZN 1999: Article 73.1.2.) as ‘unique’, but not for S. elegantulus, which is why I conclude that the species was described after more than one specimen. Thus, I consider the four remaining specimens as paratypes, because they originate from the type locality and the Cameron collection at NHML.

New Indonesian records: Bali: Jembrana: env. Cekik, 20.6. 1994, 300 m, leg. Wunderle (PWCM). Jawa Barat: Sukabumi, Sirnarasa, Cisarua: Ciawitali River (06°51’39’’S, 106°30’48’’E), 680 m, 20.9.2015, leg. Frisch (MFNB, MZB); Sukabumi, Cikaniki: Cikaniki River (Mt Halimun, Halimun-Salak NP), 950 m, 26.4.1999, leg. MZB (MZB); Sukabumi, Cikaniki: Cikaniki River (Mt Halimun, Halimun-Salak NP), (06°44’46’’S, 106°32’25’’E), 1020 m, 17.9.2015, leg. Frisch (MZB); Sukabumi, Sirnarasa: Cimaja River (S-slope Mt Halimun), (06°51’32’’S, 106°31’06’’E), 670 m, 21.9.2015, leg. Frisch (MFNB, MZB); Sukabumi: Simaresmi (Halimun-Salak NP), (06°49’44’’S, 106°30’02’’E), 1190 m, 22.9.2015, leg. Frisch (MFNB, MZB); Sukabumi, Kiara Dua: Ciletuh River (07°08’27’’S, 106°37’46’’E), 710 m, 24.9.2015, leg. Frisch (MFNB); Sukabumi, N Djampang Kulon: Cikarang River (07°14’03’’S, 106°36’49’’E), 250 m, 25.9.2015, leg. Frisch (MFNB, MZB); Bogor [Buitenzorg], leg. Lea & wife (SAMA). Jawa Timur: Situbondo: 15 km N Wonorejo (Baluran NP), 50 m, 24. – 28.6.2001, leg. Bolm (SMNS); Tulungagung [Toeloengagoeng], 84 m, leg. Louwerens (NHML). Riau: Bukit Tigapuluh NP (0°50’S, 102°26’E), 18. – 25.1.2000, leg. Bezdĕk (PKCC). Sumatera Barat: Bukittingii: Fort de Kock, 920 m, 1926, leg. Jacobson (NHML).

Redescription: Habitus and coloring as in Fig. 18. Head subcircular. Penultimate antennal segment quadrate or slightly elongate. Mesotibia strongly thickened. Body surface shiny with fine, spacious, setose punctation; microreticulation absent. Pubescence of body surface short, erect. Body orange-brown to black-brown with reddish tinge, usually reddish dark brown with pronotum and abdomen somewhat lighter than head and elytra; tip of abdomen and posterior sixth of elytra yellow-brown; maxillary palpi light medium brown; antennae with scapus medium brown and pedicellus and subsequent segments more or less blackened, gradually lighter towards light brown terminal segments. Total body length 3.1 – 3.7 mm; forebody length 1.9 – 2.1 mm.

Male: Abdominal sternite VII with unmodified posterior margin. Abdominal sternite VIII in about posterior fifth with wide, triangular emargination straight in median fourth (Fig. 136). Aedeagus (Figs 43, 95 – 97) about 0.7 mm long, with short, asymmetrical distal lobes; apical lobes rectangular with wide, truncate apex and small, acute, apicoventral tooth (Figs 43, 95), in ventral strongly curved distomediad and slightly overlapping distomedially (Figs 96); dorsal lobe stout, transverse, with apex emarginate (Figs 96, 97); flagellum short, thin, projecting from apical lobes ventrally as well as small, proximad curved tooth proximal of flagellum (Figs 43, 95); setose lateral lobes absent (Figs 96, 97); ventral lobe about twice as long as wide with apex acute in lateral view (Figs 43, 95), but deeply emarginate in ventral view (Fig. 96); median foramen oblong with acute proximal end, occupying more than half of phallobase length (Fig. 96), with transverse ridge weakly sclerotized and lateral ridges of median foramen bent up ventrad (Figs 95, 96: arrows II, III).

Female: Chamber of sperm pump elongate, with apophysis adjacent to bursal duct (Fig. 171); bursal duct about twice as long as sperm pump; bursa membranous (Figs 170).

Phylogeny: Scopaeus elegantulus is a member of the S. gracilis species group (Frisch et al. 2002: 39).

Distribution: Described from Pahang in the Malay Peninsula, Scopaeus elegantulus is widely distributed across Indonesia and recorded for Java, Sumatra and Bali.