light green, about 2″ long, with green specks and diagonal white/green stripes along sides. Large head. Pointed rump, no stinger. Looks almost a variegated light yellow to dark green from head to tail. Found on a Cabernet Sauvignon grapevine (California)
It’s an Achemon Sphinx Moth Caterpillar.
So glad you figured it out! Was pretty sure that was what it was, but the photo was not close up enough to be positive.
The moth is really neat also tho not quite a pretty as most butterflies.
The Pandorus moth caterpillar does look similar and feeds on the same plants. The moth is quite colorful.