I have never seen this before
Location:  Dixon Missouri, USA
August 14, 2010 5:05 pm
this insect stung my son when he swept it off his arm after trying to shake it off and it sticking to him. its very small about the size of a pea. at the biggest.

Nason's Slug

Hi Tim,
This is one of the Stinging Slug Caterpillars in the family Limacodidae.  We quickly identified it as Nason’s Slug,
Natada nasoni, by searching BugGuide.

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