Looks like either Cacopsylla mali or Psylla sanguinea.

With the exception of one easily identifiable species (Psylla buxi), the genus Psylla in our area can be distinguished from most Cacopsylla on the basis of antenna length; Psylla (including sanguinea) having antennae greater than 2x the width of the head, often as much as 3x. Yours has antennae about 1.75x the width of the head, and with black tips, which is consistent with C. mali and a few other species, such as C. peregrina. Those two species, both palearctic introductions, are unlikely to be distinguished from this angle. However, the latter has not been recorded from Maine and is primarily known from the PNW. The first US record of C. mali was taken in Maine in neighboring Knox county in June of 1980. Hosts mentioned in that report include apple, plum, and quince.

Great information. So the eye color is variable? That was the main reason why I discluded C. mali, I couldn't find any with red eyes like the individual in my photo.