Black Hairstreak (Satyrium pruni)

Underside. Never settles with wings open. Sexes appear similar.
Underside. Never settles with wings open. Sexes appear similar.
The row of black dots on hindwing allows species to be distinguished from other hairstreaks.
The row of black dots on hindwing allows species to be distinguished from other hairstreaks.
 
Information

Law: Protection under the Wildlife and Countryside Act 1981.
NERC Act S41: Not listed
Local status: Rare. (Bedfordshire's rarest butterfly).
Only found in a couple of small colonies, some on private property.
Only about 45 colonies exist in the whole of Britain, all in south-east midlands.
Size: Small.
Larval foodplant: Blackthorn.
No. of broods: One.
Flight time(s): Only 2-3 weeks duration(!) usually during second half of June, but flight period varies each year, so to avoid missing it completely start looking before mid-June.
Winter: Egg.
Habits: Occasionally flies, mostly from around lunchtime, but loves to skulk around the tops of trees out of sight, feeding on honeydew. May come down to feed on wild privet or bramble. Often requires lots of patience to find and binoculars to get a good view.
Habitats: Mature thickets of sheltered sunny Blackthorn, usually in woodland.
Distribution:

Normalized Weekly Abundance


Flight time graph


No. of Adults

Number of adults
No. of 1km Squares

Number of 1km squares
No. of Records

Number of records
No. of Adults per record

Adults per record
Percentage of all adults

Percentage of all adults reported (of all species) in each year
Percentage of all records

Percentage of all butterfly records
No. of adults per 10,000 records

Number of adults in every 10,000 butterfly records (of all species)