Basic colour: Deep metallic blue with a violet reflection.
Pattern colour: None
Number of spots: None
Other colour forms: Sometimes
Pronotoum: Deep metallic blue with a violet reflection.
Leg colour: Deep metallic blue with a violet reflection.
Has been considered in immigrant species, but this is not certain. Much life cycle information is from populations in France where new adults emerge in July and August, feed on alder leaves for 12-15 days, then enter a diapause on the ground surface, followed by hibernation until spring. Larvae usually feed on leaves of alders, but can develop on Downy Birch, Hazel and Goat Willow. Pupation occurs in an earth cell just below the ground surface, or in leaf litter. Adults can fly, but flight activity is low.
Habitat: Open, sunny areas in wetlands, especially alder carr. River banks. Wet woodland flushes.
Host plant: Alders, hazel, hybrid black-poplars, Goat Willow.
Overwintering: Adults overwinter in soil and leaf litter near host trees, emerging in April.
Food: Alder leaves.
Other notes: In southern France and Spain, adults may feed on fruits of the Rose family (e.g. pears, apples, plums, cherries).