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ok Chris, I see the part of the vein you mean. I should have realised from your update notes to Belshaw, available on your website. So maybe it isn't heraclei afterall. YES, its the ventral side.

Theo, I cannot argue with your logic apart from to say I'm processing photos of dried flies in batches and therefore refer you to the works of Adam Smith et al and the idea of "Division of Labour" :P

Best Regards,

Steve