Size: 7.5-8.3mm
Basic colour: Green and coppery to almost black.
Pattern colour: Uniform.
Pronotoum: Narrower and flatter than elytra.
Leg colour: Dark brown
Confusion species: Agonum muelleri

The history of this beetle in Britain is an intriguing one and neatly summarised on Mark Telfer's website where it has been assigned the status of missing Carabid: http://markgtelfer.co.uk/beetles/carabidae-ground-beetles/live-carabids-needed-can-you-help/agonum-chalconotum/

Size: 4-4.5mm
Basic colour: Head black, pronotum normally uniformally bright red-brown. Elytra black with basal third, suture and margins red brown.
Pronotoum: Transverse, sides strongly rounded and hind angles indistinct; foveae almost impunctate.
Leg colour: Brown.
Confusion species: Acupalpus flavicollis
, Confusion species: Acupalpus parvulus