Abstract：
Among Afrotropical genera of Osoriini, Madegassosorius Scheerpeltz is exceptionally poorly defined. Although later authors maintained this genus, they restricted its diagnostic features and distinguish it from the apparently highly similar Mimogonellus Fagel merely by the structure or presence of the lateral pronotal carinae and the elytral adsutural striae. A comprehensive survey of specimens belonging to most world genera of Osoriini suggested that these characters may be variable within the genus and therefore of weak taxonomic value. In order to test this hypothesis, the type species of Madegassosorius and Mimogonellus were studied in detail, as well as dozens of additional specimens belonging to this unclearly defined group. As a result, Madegassosorius syn. n. is placed as a junior synonym of Mimogonellus, and the latter genus is redefined and redescribed. A lectotype is designated for Mimogonus leleupi Cameron, the type species of Mimogonellus. The synonymization of Madegassosorius with Mimogonellus results in one case of secondary homonymy, and Mimogonellus longipennides nom. n. is proposed as a replacement name for Mimogonellus longipennis (Coiffait, 1979) comb. n. (ex Madegassosorius), nec Mimogonellus longipennis Fagel, 1960.
摘要：
在奥索里尼的非洲属中，MadegassosoriusSchespeltz的定义异常模糊。尽管后来的作者保留了这个属，他们限制了其诊断特征，并仅通过外侧胸骨和鞘膜的结构或存在来将其与明显高度相似的MimogonellusFagel区分开。对属于世界大多数Osoriini属的标本的全面调查表明，这些特征在属内可能是可变的，因此具有较弱的分类学价值。为了检验这个假设,详细研究了Madegassosorius和Mimogonellus的类型物种，以及数十个属于这个不明确定义组的其他标本。因此,Madegassosoriussyn.n.被放置为Mimogonellus的初级同义词，后一个属被重新定义和描述。为MimogonusleleupiCameron指定了一个型号，Mimogonellus的类型物种。Madegassosorius与Mimogonellus的同义导致一例次要同义，和Mimogonelluslongipennides编号。n.被提议作为Mimogonelluslongipennis(Coiffait，1979）梳子。n.(前Madegassosorius)，NECMimogonelluslongipennisFagel,1960.
