Again! A Northern Blue, maybe?

I don't know as much about butterflies as I did forty years ago. I find that shocking, that a person's working life can empty out of his head bits of information he used to consider important enough to remember about the natural world. But I am very happily retired now and I am aiming to refill the crevices, the crevasses, of knowledge.

Thus I'm trying to learn the butterflies of my part of the world, Newfoundland. This is one of the amazingly blue butterflies that become drab and grey-brown when they close up their wings. A Northern Blue, I think, but I am awaiting correction from friends whose heads did not suffer the same informational reaming that mine did.