Oh, hi! This friendly looking insect with fearsome hooklike feet is a grapevine beetle Pelidnota punctata.* It uses those feet to cling and clamber about on grapevines, eating the fruit and leaves in the cover of dark. I have never encountered one on our Concord grapevines Vitis labrusca.** Instead we find them bumbling about our porch light, rattling against the door at night. On one memorable occasion, we hosted a moth night, and caterpillar expert
Sam Jaffe attended--he found a grapevine beetle and affixed it to his forehead. The little tarsal claws held on good and tight for a while, bringing painful slapstick to an absurd sight gag.
* Pelidnota from Greek pelidno, livid (dark, inflamed/leaden tinge of the skin) plus nota, the back. Punctata meaning spotted.
** Grapevine, wild grapevine