One reason, we don't have such Blues like argyrognomon, coridon or bellargus in Finland, are the hosts. These species have very narrow host plant spectrum: Hippocrepis comosa and Coronilla varia are practically non-existent here. Also the host of dorylas, Anthyllis vulneraria, is uncommon in Finland.
England, Kent Lyddon Heath, ex ovo Aug. 1998, Leg: N. Venters,
Photo © Kimmo Silvonen