Taxonomic status of Enochrus simulans and E. umbratus (Coleoptera: Hydrophilidae)

Enochrus umbratus (Sharp, 1884) stat.rev.has been restored in the species status and the lectotype and paralectotypes of Philydrus umbratus Sharp, 1884 has been designated.Enochrus umbratus is still known only from type specimens, all other published records of this species are belongs to Enochrus simulans (Sharp, 1873).Due to the absence of a new fi ndings more than 140 years, it is proposed that Enochrus umbratus is very rare species or can be a migrant from other region, occasionally collected in Japan.Redescriptions of Enochrus simulans and E. umbratus with diagnostic features, illustrated by original photographs and line drawings, are provided.