One-eyed Sphinx

From Bill Oehlke: Smerinthus jamaicensis closely resembles Smerinthus cerisyi, but jamaicensis is much smaller with larger blue patches on more vibrant and deeper purple in the lower wings. Also note the complete (i.e. outer margin to outer margin) off-white arc just below the forewing apex. In S. cerisyi the lower portion of the arc does not return to the outer margin.