The Black Hairstreak (Satyrium pruni) is a butterfly in the family Lycaenidae.
Appearance, behaviour and distribution
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 upperside hindwing. In the female these spots also extend to the forwings. The undersides are similar to the White-letter but the white line tends to be straighter and the orange border extends onto the forwings. 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. They spend most of their lives in the canopy or in dense scrub, feeding on honeydew
, and very rarely come down to ground level. In the UK there are now only about 45 colonies, all in a small part of the East Midlands between Oxford and Peterborough. Historically there have been around 90 known colonies since its discovery in 1828 but there have been many, mostly unsuccessful, introductions at various locations in southern England including one in surrey in 1952 that seemed to be successful until the habitat was destroyed! It is widespread across Europe and Asia as far as Japan.
Life cycle and foodplants
Eggs are laid singly on young Blackthorn Prunus spinosa
growth and it is this stage which hibernates. Although Blackthorn is the main foodplant, Wild Plum Prunus domestica
and other Prunus
spp are occasionally used. The caterpillar hatches the following spring, at the end of April, just before the buds open and feeds on the flower buds. Older larvae are green and well camouflaged against the leaves on which they feed. Pupation takes place on leaves or twigs in June and the pupae are patterned black and white to mimic a bird dropping, as a defence against being eaten. The adult butterflies of this single-brood (univoltic) species are on the wing from the end of June to mid July.