Hovahydrus n.gen., with four recognized species-H. minutissimus (Régimbart), H. praetextus (Guignot), H. perrieri (Fairmaire) and H. sinapi (Guignot)-is described. The genus occurs in Madagascar. The four species assigned to Hovahydrus n.gen. have all been previously described and until now included in the genus Hyphydrus. Redescriptions together with illustrations of the male genitalia and a key to the species are given. Lectotypes for H. minutissimus and H. perrieri are designated.