Agonum placidum

{{short description|Species of beetle}}

{{Speciesbox

| image = Agonum placidum - inat 310381995.jpg

| image_caption = Agonum placidum, Canada

|taxon=Agonum placidum

|authority=Say, 1823

|synonyms= {{Specieslist

|Agonum morosum|Dejean, 1828

|Agonum alcyoneum|Chaudoir, 1837

|Agonum transpunctatum|Bates, 1878

|Agonum amplior|Casey, 1920

|Agonum aztecanum|Casey, 1920

|Agonum citatum|Casey, 1920

|Agonum rhodeanum|Casey, 1924

}}

}}

Agonum placidum is a species of black coloured{{Cite web| title=Agonum placidum (Say, 1823) | url=https://www.catalogueoflife.org/data/taxon/65T3G | website=Catalogue of Life | access-date=2023-04-08 }} ground beetle in the Platyninae subfamily that can be found in woodlands, thickets, and open fields of southern Canada and northeastern United States.{{cite book|url=https://books.google.com/books?id=aWVi0IF_jcQC&dq=Agonum+placidum&pg=PA136|author1=Eric R. Eaton|author2=Kenn Kaufman|title=Kaufman Field Guide to Insects of North America|year=2007|page=136|publisher=Houghton Mifflin Harcourt |isbn=978-0-618-15310-7|lccn=2006029511}}