| Abstract: | To facilitate a revision of Otostigmus (Otostigmus) which currently comprises 61 species, the subgenus is here subdivided into nine species groups based on Attems’ (1930a) monograph. The largest, the rugulosus group, is the subject of this paper. In most cases, the type material is redescribed and variation discussed.
The following species are valid: Otostigmus rugulosus Porat, 1876, O. spinosus Porat, 1876, O. astenus (Kohlrausch, 1881), O. punctiventer (Tömösváry, 1885) (lectotype designated), O. olivaceus Attems, 1934, O. noduliger Verhoeff, 1937 (lectotype designated), O. angusticeps schindleri Würmli, 1972, O. martensi Lewis, 1992, and O. beroni Lewis, 2001. O. feae Pocock, 1891, O. fossuliger Verhoeff, 1937 and O. rugulosus striaturatus Verhoeff, 1937 are retained as valid but more data are required to establish their true status.
Reasons for previous confusion between O. rugulosus and O. scaber Porat, 1876 are discussed as are reasons for specimens of O. astenus being identified as O. punctiventer and some O. punctiventer as O. spinosus.
A lectotype is designated for Otostigmus armatus Attems, 1958 which is a junior subjective synonym of O. multidens Haase, 1887. Otostigmus owenii Pocock, 1892, is a junior subjective synonym of O. rugulosus and O. lewisi Song et al., 2005 a junior subjective synonym of O. beroni. Otostigmus rugulosus var. mertoni Ribaut, 1912, O. celebensis Attems, 1934, and O. dammermani Chamberlin, 1944, are nomina dubia.
A key to the species is provided.
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