Note Cannot use flight time to separate from September Thorn as both can occur in July! The outer cross-line is usually kinked where it meets the leading edge of the wing - not so in September Thorn. Inner cross-line of August has a longer, and more pronounced angle where it meets the wing edge. Also August holds its wings at a lower angle
Recorded in 90 (64%) of 140 10k Squares. First Recorded in 1869. Last Recorded in 2022. (Data up to end 2022) Additional Stats
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