Butterflies: Blues
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My first ID of this was Boisduval's Blue but with a better book informing of its rarity I now think not. It's close to what Peterson's Western Butterflies calls a Summer Azure which is not mentioned in the more authoritative Pyle's The Butterflies of Cascadia, which does talk about a summer hatch but does not picture them, so I'm going with Spring Azure summer hatch, hence Summer Azure.