I came across this beetle a few weeks ago in a floodplain forest in southeast Michigan. The poor thing doesn’t seem to have a common name, so I’ll just generically refer to it as a leaf mining hispine beetle (Sumitrosis inaequalis, Chrysomelidae). The larvae apparently feed on plants in the families Asteraceae (asters) and Fabaceae (legumes). This adult happened to be on neither.
This beetle bears a strong resemblance to the basswood leaf miner (Baliosus nervosus, Chrysomelidae), which I’ve covered once or twice before. Both beetles are in the same tribe (Chalepini) within the same subfamily (Cassidinae).