Carnifex wrote:
I tried to access the Speight & Sommaggio paper in the first place, as it was referenced in another discussion here in this forum dealing with Xanthogramma (https://diptera.i...d_id=54819), but the link doesn't work anymore and I tried hard to find the PDF somewhere, to no avail. So I used the Dutch publication instead, which has a key and discusses in detail the difference between the three similar species. I am well aware how to use internet search engines.

If someone could provide a link or send me the document (Speight & Sommaggio) it would be very much appreciated.

If you, Piet, have more experience with these species and you know that the yellow spots are variable, why not telling me in first place? Because this is what I got from the Dutch document, that it is in fact a valuable feature. Maybe I translated it wrong or your experience contradicts some of the statements the authors made, however, a simple 'no' doesn't help me at all, just three or four more words would have been much more valuable for me.

Best,
Lorin