This photo was sent to me recently and appears to be Mydaea sp insofar as the bulge in the mediastinal vein is present. It was photographed last June at High Batts NR, near Ripon, N.Yorks..Can anyone help please?
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The wavy mediastinal vein is…
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The wavy mediastinal vein is present in a number of genera. There are other characters (not visible in this photo) which will indicate the genus. Having said that, Mydaea often have a more shiny appearance than related genera, and this one seems to fit that. In which case, it's most likely to be Mydaea corni - based on colour and the presence of two pairs of pre-scutellar bristles.