Revision of Scopaeus Erichson, 1839 (Coleoptera, Staphylinidae, Paederinae) of Indonesia, with description of 19 new species Author Frisch, Johannes Author Narakusumo, Raden Pramesa MUseUm ZoologicUm Bogoriense, Research Center for Biosystematics and EvolUtion, National Research and Innovation Agency (BRIN), Jl. Raya Jakarta-Bogor KM 46, Cibinong, West Java, 16911, Indonesia text Soil Organisms 2022 2022-04-01 95 1 23 73 http://dx.doi.org/10.25674/so95iss1id311 journal article 10.25674/so95iss1id311 2509-9523 10724236 Scopaeus uncinatus Frisch , spec. nov. ( Figs 19 , 44 , 101– 103 , 137, 172) Type specimens: Indonesia : Holotype ♂ , Banten , Lebak : Citorek Kidul ( 06°44’51’’S , 106°19’13’’E ), 870 m , 23.5.2016 , leg. Frisch ( MZB ) . Paratypes ( 9 specimens ): 2 ♂ , 3 ♀ , same data as holotype ( MFNB , MZB ) . Jawa Barat : 3 ♀ , Sukabumi , NNW Cidahu : Cirasamala River (S-slope Mt Salak ), ( 06°44’18’’S , 106°42’52’’E ), 1210 m , 29.9.2015 , leg. Frisch ( MFNB , MZB ) ; 1 ♂ , Sukabumi , Cikaniki : Cikaniki River ( Mt Halimun , Halimun-Salak NP), ( 06°44’46’’S , 106°32’25’’E ), 1020 m , 5.10.2015 , leg. Frisch ( MZB ) . Description: Habitus and coloring as in Fig. 19 . Head subquadrate. Penultimate antennal segment quadrate. Mesotibia moderately thickened. Body surface subnitid with fine, dense, setose punctation; microreticulation obtuse or absent. Pubescence of body surface short, decumbent, without conspicuous macrosetae. Forebody dark brown; abdomen medium brown with blackened disk of abdominal segments to unicolorous black-brown; posterior margin of elytra and tip of abdomen medium brown; maxillary palpi light brown; antennae unicolorous light brown or with darker median segments, in dark specimens from blackened scapus gradually lighter towards light brown terminal segments. Total body length 3.6 – 4.3 mm ; forebody length 2.1 – 2.3 mm . Male: Abdominal sternite VII with unmodified posterior margin. Emargination of abdominal sternite VIII very short, shaped like transverse ‘}’, occupying posterior tenth of sternite length only (Fig. 137). Aedeagus ( Figs 44 , 101 – 103 ) about 1.0 mm long, with short distal lobes; apical lobes in lateral view slender with hooked ventrad curved apices divided in strongly sclerotized distal and membranous proximal part ( Figs 44 , 101 ), membranous and convex laterally with parallel, mediad curved subtruncate ends ( Fig. 102 ) connected by transverse, mediodistal bridge ( Fig. 103 : arrow III ); dorsal lobe in lateral view with acute end, triangularly widened ventrad and projecting from apical lobes ventrally, in ventral and dorsal view widely convex with minute, apicomedian incision ( Figs 102, 103 ); flagellum short, not projecting ventrally ( Figs 44 , 101 – 103 ); lateral lobes large, strongly projecting ventrolaterally, each with membranous, strip-like, proximal enlargement ( Fig. 102 : arrow II ) and group of ventromediad pointing setae; ventral lobe large, strongly projecting ventrodistad, with convex end in lateral and ventral view ( Figs 44 , 101, 102 ); median foramen small, shaped like transverse crescent moon, with transverse ridge projecting ventrally ( Figs 44 , 101 ). Female: Chamber of sperm pump with short, curved apophysis; bursal duct about as long as sperm pump; bursa with strongly sclerotized end ( Fig. 172 ). Distribution: Scopaeus uncinatus is hitherto known from western Java only. It was collected at the edge of Mount Halimun-Salak National Park in Banten and Jawa Barat . Etymology: The epithet uncinatus (adjective, Latin: ‘hook-shaped’) refers to the hooked apical lobes of the aedeagus of this new species ( Figs 44 , 101 ).