Species Account

Select species and region:



Summary Data

Season (Adult / Immature):

National Status: Local

Local Status: Scarce and local resident.

Local Record: Grade 3   See here for explanation

Flight time: One generation, Aug-Sep.

Forewing: 18-22mm.

Foodplant: Pedunculate Oak and Sessile Oak.

Regional breakdown:

Year first recorded19041857188318831981
Year last recorded20142014201420141981
Number of records40920435171
Number of individuals35832728131
Unique positions622223111
Unique locations642223101
Adult records39720031171
Immature records41000

For the county, we have a total of 666 records from 120 sites. First recorded in 1857.


70.233 August Thorn 02
© Andy Nunn
70.233 August Thorn 01
© Ian Marshall, 2 Aug 2008

Species Account

Sutton & Beaumont, 1989: Very local. Only recorded from one or two sites in each vice-county, although there would not appear to be any lack of suitable habitat.

2012 (CHF): August and September Thorns can be tricky to separate if you are not familiar with them. One tip is that August Thorn holds its wings at a much lower angle. The two species have quite different distributions in the county with August Thorn in the east and September Thorn in the middle of the county. The range overlaps a little in the south. Despite the names, the flight times are almost identical. Numbers tend to fluctuate a lot and this species was very uncommon in the 1990s.

See background to species accounts.  Index of Vernacular names - Search - Random Species