Abstract
Madagassoconnus Franz and Oneila Peringuey were described as genera, but their diagnoses largely overlap with that of Euconnus. Results of detailed morphological studies justify placing Madagassoconnus and Oneila as subgenera of Euconnus. Madagassoconnus differs from most of previously reviewed subgenera of Euconnus in minor characters, mainly in tarsomeres III and IV forming elongate anteroventral lobes. Oneila differs from other subgenera mainly in strongly and uniquely modified antennomeres VII and VIII, or only VII, in males; other characters are almost identical as those in Tetramelus Motschulsky, Paratetramelus Franz and Heteroconnus Franz. However, results of preliminary phylogenetic analyses are still inconclusive, and a conservative approach is adopted to treat Madagassoconnus and Oneila as valid names, pending further study. Previous (and the only) redescription of the type species of Madagassoconnus, Cyrtoscydmus kolbei L.W. Schaufuss, is discussed as likely based on misidentified specimens not conspecific with the type material. Madagassoconnus arganoi Franz that occurs in Mexico (in contrast to all remaining species of Madagassoconnus that are endemic to Madagascar) is placed as Euconnus (incertae sedis) arganoi comb. n., and Oneila camerunensis Franz known to occur in Cameroon, is placed as Euconnus (incertae sedis) camerunensis comb. n.
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