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Well I have checked 11 specimens from 5 sites/dates and I am not as happy as I should be. I would like to be sure what ta and tp are to start with.

Then all my specimens are variable in colour from reddish yellow, or perhaps orange, to clear yellow, the MSN stripes are clearly seen on the darker specimens and absent in the two lightest specimens, but all are the same in having the costal cell obviously darker than the rest of the wing, and there is a hint of a fade-in-to a darker costal edge.

Thanks,
Gordon