Black hairstreak

Appearance

T. pruni L.. Above in the male with a few anal spots, in the female an anal halfband and sometimes a discal spot brick-red. Beneath the line of white bars is very thin, and the brick-red submarginal band of the hindwing is placed between two rows of black spots, which are thinly edged with bluish white, and is sometimes continued on to the forewing. Throughout Central and South Europe, from the Atlantic coast and Great Britain throughout Europe and Asia to Amurland and Corea; but absent from North Africa and probably also from Japan, the specimens recorded from the latter country presumably belonging to "mera" or "prunoides" In ab. "fulvior" Tutt the forewing bears an orange-yellow discal patch, the rest of the wing being dusted with golden brown. In ab. "ptorsas" Hfngl. both wings have a reddish yellow submarginal band above; transitional specimens have an incomplete band. ab. "obsoleta" Tutt has no reddish yellow anal spots above, while these spots are pale yellow instead of red in ab. "lutea" Tutt. A "lutea" specimen in which the underside is dull and has no black spots on the proximal side of the band on the hindwing has received the name ab. "paupera" Tutt, and individuals with a broad white macular band on the underside parallel to the outer margin are ab. "albofasciata" Tutt. — Egg quite flat, chagreen, greyish brown, with the top concave; deposited singly or in pairs. Larva woodlouse-shaped, green, with a darker
dorsal stripe, at the sides of which there are small brown warts or tubercles; from April till the end of May on Blackthorn and Plumtrees. It has been observed to attack other pruni larvae which had fastened themselves before moulting. Pupa anteriorly somewhat angular, black-brown, with darker markings and a pale saddle-patch, the abdomen being tuberculate and strongly raised, the whole resembling a small bud or bird-droppings. The butterflies appear in June, usually flying singly, being so abundant however in certain years that one can easily obtain several dozen within an hour. At such occasions they fly about the twigs of the food-trees and the undergrowth beneath them; they are very partial to flowering privet.

Distribution

The butterfly is native to Europe, from Scandinavia to Ukraine, and is found as far east as Mongolia, Korea and Japan. It is considered by IUCN to be stable and of least concern.

Behavior

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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 species are on the wing from the end of June to mid July.

Food

This section does not any. Please help by adding citations to reliable sources. Unsourced material may be challenged and.
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 species are on the wing from the end of June to mid July.