Showy sawfly larva; unidentified -- white with black squares, 15 mm long. I believe the host plant is Wingstem (shot below) -- it has a four-winged stem. Closest ID I have found is possibly subfamily Allantinae, based on bugguide.net/node/view/196436.
This photo also appears in
keyboard shortcuts: ← previous photo → next photo L view in light box F favorite < scroll film strip left > scroll film strip right ? show all shortcuts