I keyed this out to Harpalus protractus (Ball & Anderson 1962). Diagnostic features in accordance with the provided key include:

1. Elytral stria impunctate.
2. Specimen from the USA.
3. Elytral intervals densely punctate (micropunctules).
4. Posterolateral angles rounded.
5. Posterior groove of pronotum not interrupted laterally.
6. Pronotum with anterior margin not angularly emarginate, sides broadly rounded.
7. Elytral Length = 9mm (more than 7mm)

I observed many specimens that all emerged simultaneously at our plots late in the season. Due to the "wideness" of the pronotum I thought this could potentially be Harpalus actiosus. What led me away from H. actiosus is the range (AL not included), and the margin of the pronotum lacking the characteristic angular emargination. Rather, the margin of the pronotum is broadly rounded in my opinion.


This specimen was collected by NEON in a pitfall trap containing a 1:1 ratio of water and propylene glycol.