145055 Black Hairstreak Satyriuim pruni Wingspan 35mm. A rather sluggish butterfly with lethargic flight. Easiest to see when feeding on Privet flowers or honeydew on leaves. Adult seldom reveals upperwings. Underwings are rich brown with orange band white line on both wings. Upperwings are dark grey-brown. Flies July. Larva is rather slug-like and feeds on Blackthorn. Pupa has markings that make it look like a bird dropping. A rare butterfly, found in open woods with Blackthorn thickets; mainly in the East Midlands.