Domain:Eukaryota
Kingdom:Animalia
Phylum:Arthropoda
Class:Insecta
Order:Coleoptera
Infraorder:Cucujiformia
Family:Meloidae
Subfamily:Meloinae
Tribe:Meloini
Genus:Meloe
Black ones feed on Lupin, then delphinium
Grey ones on Lupin
Could this be Australozonitis pallicolor?