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.
Foodplant: Pedunculate Oak and Sessile Oak.
|Year first recorded||1904||1857||1883||1883||1981|
|Year last recorded||2014||2014||2014||2014||1981|
|Number of records||409||204||35||17||1|
|Number of individuals||358||327||28||13||1|
For the county, we have a total of 666 records from 120 sites. First recorded in 1857.
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.