Size: 2.8-4.2mm
Basic colour: Metallic green or blue
Pattern colour: None
Number of spots: None
Pronotoum: As basic colour
Leg colour: As basic colour

A. ericeti is a continental European species not found in the UK, and British specimens may be more accurately considered as A. longicollis (e.g. Denton 2009). A. ericeti is used in Duff's 2008 checklist (Duff 2008) but updated to A. longicollis in the 2012 edition (Duff 2012). The junior synonym A. britteni may also be found in use e.g. in Kevan (1962) which keys out British species using features of the dissected-out genitalia.

• Denton, J. (2009). Beetles of Surrey: First checklist update. The Coleopterist 18(1): 55-58.
• Duff, A.G. (ed.) (2008). Checklist of Beetles of the British Isles: 2008 edition. A.G.Duff, Wells.
• Duff, A.G. (ed.) (2012). Checklist of Beetles of the British Isles (2nd edition). Pemberley, Iver.
• Kevan, D.K. (1962). The British species of the genus Haltica Geoffroy (Col., Chrysomelidae). Entomologist’s Monthly Magazine 98: 189-196.

Recognised as British in 2000, though specimens attributable to it have now been found in collections going back at least as far as 1939. It has previously been confused with A. palustris and A. pusilla var. montana.

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.