automeris

One of many male Automeris io from Wellfleet/Eastham, Cape Cod, MA.
These are also in the Saturnidae family and have no functioning mouthparts. The larvae feed together until the final instar. The females of this species have brown forewings instead of yellow. Automeris is a new world genus. The caterpillars can also give a nasty sting.

Expect more photos soon.