Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Black Hairstreak (Satyrium pruni) is a butterfly in the family Lycaenidae.This small brown butterfly is one of Britain's most localised and rarest. At first glance it is very similar to the White-letter Hairstreak but the Black Hairstreak has a row of orange spots along the edge of the upper-side hindwing. In the female these spots also extend to the forewings. The undersides are similar to the White-letter but the white line tends to be straighter and the orange border extends onto the forewings. The most conclusive way to distinguish the two is by the row of black spots accompanying the orange band which the White-letter Hairstreak never has.

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