Posted by blowave on 23-06-2011 13:33
#6
Mark van Veen keys doesn't mention yellow at the edges of the abdomen for S. dignota.
S. selenitica spots do not reach the sides where for S dignota they normally do reach the margins.
Search for Scaeva dignota on this site, many other sites are not reliable.
You might post this in the syrphidae forum where it will get the attention of syrphidae experts.