Yasnosh, V.A. 1974 A new species of Physcus Howard (Hymenoptera, Aphelinidae) from Italy.. Bollettino del Laboratorio di Entomologia Agraria 'Filippo Silvestri'. Portici 31: 105-108.

Notes: Parasites of this genus frequently control many diaspine scale insects injuring fruits and other crops. Physcus viggianii is new species, reared from Evallaspis ampelodesmae.