Bembidion (Odontium) confusum
The Beetle of the Day today is Bembidion confusum. This is a common species on sandy river and pond shores east of the Rockies in North America. It’s the species whose head appears on the “Subulate Palpomere” sign.
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David Maddison
The Subulate Palpomere 
What’s the etymology behind the epithet?
Not sure. But there are many names of Bembidion that suggest various authors had difficulty with them: confusum, dejectum, impotens, difficile, etc. I will write a post about these sometime.