Hyphydrus holomelas Bistrom 1984

Bistrom 1984. Description of Hyphydrus holomelas sp. n. and H. gibbosus sp. n., with new records of Derovatellus, Hyphydrus, Yola and Yolina (Coleoptera, Dytiscidae). Annales Entomologici Fennici, 50(3) 1984: 89-92