Taxonomy of 'Euconnus complex'. Part XIX. Status of subgenus Borneoconnus Franz, with review of species (Coleoptera, Staphylinidae, Scydmaeninae).

Borneoconnus, a subgenus of Euconnus endemic to Borneo, is revised. Euconnus laticlava Franz (type species of subgenus), E. eremita Franz and E. sabahanus Franz are redescribed. Morphological structures of E. laticlava are illustrated and described in detail. It is concluded that Borneoconnus is most similar to Euconnus s. str., Napochus Thomson and Psomophus Casey; differences in morphological structures are discussed. Borneoconnus is maintained as a separate subgenus, pending further study, as this name seems to be a candidate to place as a junior synonym of Napochus in a future reclassification of Euconnus subgenera. The variability in the pronotal form found within otherwise morphologically uniform Borneoconnus species supports a weak taxonomic value of this character to use in subgeneric diagnoses. This observation may result in merging Euconnus s. str. and Napochus Thomson, and possibly also Borneoconnus, in one subgenus. However, the yet unrevised subgenera of Euconnus must be studied before such an action is taken.