Scientiae biologicae

Based on a morphological study of material of 14 genera of Lomechusini from the Oriental and East Palaearctic regions, primarily from Laos and Borneo, and of some specimens from Irian Jaya, numerous species are described and illustrated, 78 of them for the first time: Orphnebius abbreviatus sp. nov. (Laos), O. crassisetosus sp. nov. (Laos), O. taleatus sp. nov. (Borneo), O. geminus sp. nov. (Borneo), O. sextuberculatus sp. nov. (Borneo), O. retornatus sp. nov. (Borneo), O. derectus sp. nov. (Borneo), O. comatus sp. nov. (Laos), O. calvus sp. nov. (Laos), O. baculifer sp. nov. (Borneo), O. unguicus sp. nov. (Borneo), O. curvatus sp. nov. (Borneo), O. varicornutus sp. nov. (Laos), O. biacer sp. nov. (Borneo), O. conifer sp. nov. (Borneo), O. mollis sp. nov. (Borneo), O. linguis sp. nov. (Borneo), O. sinulinguis sp. nov. (Borneo), O. cuspilinguis sp. nov., O. colitus sp. nov. (Borneo), O. tensus sp. nov. (Borneo), and O. pressatus sp. nov. (Borneo) of the Orphnebius hauseri group; Orphnebius (Deroleptus) transfigens sp. nov. (Borneo), O. (D.) aciformis sp. nov. (Borneo), O. (D.) acifer sp. nov. (Borneo), O. (D.) quadricultratus sp. nov. (Borneo), O. (D.) floreni sp. nov. (Borneo), O. (D.) obelifer sp. nov. (Borneo), O. (D.) nodatus sp. nov. (Borneo), O. (D.) filiformis sp. nov. (Borneo), O. (D.) plexus sp. nov. (Borneo), O. (D.) tuberculifer sp. nov. (Borneo), O. (D.) tuberosus sp. nov. (Borneo), O. (D.) granulosus sp. nov. (Borneo), O. (D.) verrucosus sp. nov. (Borneo), O. (D.) botulus sp. nov. (Borneo), O. (D.) pinnatus sp. nov. (Borneo), O. (D.) bicarinatus sp. nov. (Borneo), O. (D.) immutatus sp. nov. (Laos), O. (D.) buccatus sp. nov. (Laos), O. (D.) innexus sp. nov. (Borneo), O. (D.) furviceps sp. nov. (Borneo), O. (D.) compressus sp. nov. (Borneo), O. (D.) bituberculatus sp. nov. (Borneo), O. (D.) tensicornis sp. nov. (Borneo), O. (D.) rogans sp. nov. (Borneo), O. (D.) tuberifer sp. nov. (Borneo), O. (D.) bulbifer sp. nov. (Sulawesi Tengah), O. (D.) bulbosus sp. nov. (Philippines: Mindanao), and O. (D.) hirsutus sp. nov. (Borneo); Amaurodera dentissima sp. nov. (Myanmar), A. setosicollis sp. nov. (Borneo), and A. floreni sp. nov. (Borneo); Drusilla trituberculata sp. nov. (China: Hubei), D. longispinosa sp. nov. (Borneo), D. iniqua sp. nov. (Borneo), and D. samalica sp. nov. (Philippines: Mindanao); Witteia arboris sp. nov. (Borneo); Tensusa procera sp. nov. (Laos); Pheidologitonetes quadriplicatus sp. nov. (Laos), P. artiplicatus sp. nov. (Laos), P. acer sp. nov. (Vietnam), P. retunsus sp. nov. (Vietnam), P. sagittatus sp. nov. (Laos), and P. punctatus sp. nov. (Laos); Zyras (Zyras) bituberosus sp. nov. (Laos), Z. (Z.) semicalvus sp. nov. (Laos), Z. (Z.) janetlarae sp. nov. (Borneo), Z. (Z.) parvihirtus sp. nov. (Borneo), Z. (Z.) cyaniceps sp. nov. (Irian Jaya), Z. (Z.) maindai sp. nov. (Irian Jaya), Z. (Z.) interruptus sp. nov. (Irian Jaya), Z. (incertae sedis) pressitibialis sp. nov. (Borneo), and Z. (i. s.) cuneatus sp. nov. (Laos); Mimaenictus bisetosus sp. nov. (Thailand); Scapaenictus longiscapus sp. nov. (Laos); Planusa granulosa sp. nov. (Laos); Sulciusa boops sp. nov. (Borneo). Four monotypical genera are described: Tensusa gen. nov. (type species: T. procera); Scapaenictus gen. nov. (type species: S. longiscapus); Planusa gen. nov. (type species: P. granulosa); Sulciusa gen. nov. (type species: S. boops). Nine new combinations are established: Orphnebius mirabilis (Pace, 2014), comb. nov. (ex Keratodegnathus Pace, 2014); Pheidologitonetes thaifuscicollis (Pace, 2012), comb. nov. (ex Drusilla Leach, 1819); P. rubricollis (Cameron, 1939), comb. nov. (ex Episkiodrusilla Pace, 2013); P. malayrubricollis (Pace, 2013), comb. nov. (ex Episkiodrusilla); P. neocoenonicacollis (Pace, 2008), comb. nov. (ex Episkiodrusilla); P. vedda Pace, 1992, comb. nov. (ex Drusilla); P. veluticollis (Pace, 2013) , comb. nov. (ex Episkiodrusilla); Drusilla nilgiriensis (Pace, 2001), comb. nov. (ex Pheidologitonetes); D. bartolozzii (Pace, 2001), comb. nov. (ex Pheidologitonetes). Four new species groups are proposed within Orphnebius Motschulsky, 1858: the O. mollis, O. colitus, and O. tensus subgroups of the O. hauseri group, and the O. hirsutus species group of Deroleptus Bernhauer, 1915. The intrageneric affiliations of Orphnebius, their systematic implications, and their nomenclatural consequences are discussed. Two synonymies are established: Deroleptus Bernhauer, 1915 = Aulacothoracobius Bernhauer, 1929, syn. nov.; Pheidologitonetes Cameron, 1939 = Episkiodrusilla Pace, 2013, syn. nov. Updated catalogues of Orphnebius sensu lato and of Pheidologitonetes are provided. Additional records of 59 previously described species are reported, among them numerous new country records.