The following is from Parsons (2008). Adult beetles are typically bright metallic green dorsally with the elytra being duller and darker green. Variable amounts of brassy, coppery, or reddish reflections may be present, especially on the pronotum and ventral surfaces. Emerald Ash Borer is somewhat larger in size and more brightly metallic green than most other species in the genus Agrilus that are present in North America with total lengths less than 10-13 mm. This is the only North American species in this genus that has a bright red dorsal surface of the abdomen when viewed with the wings and elytra spread. A small blunt, slightly notched, spine is present at the tip of the abdomen and the antennae are serrate or toothed after the fourth segment.
Emerald Ash Borer is native to temperate northeastern Asia and is invasive in North America where it was first discovered in Michigan in 2002 and has since spread to over 36 states and Canadian provinces. The species was detected near Sioux Falls, South Dakota in the spring of 2018. Impacts, detection, protection, and spread prevention efforts are summarized by the Emerald Ash Borer Information Network
and the South Dakota Department of Agriculture's Emerald Ash Borer web page