Thread subject: Diptera.info :: sirphidae
Posted by Gerard Pennards on 04-12-2004 13:37
In general, if you find a specimen of Scaeva like this, there are other differences on which you can distinguish S. pyrastri from S. selenitica.
Pyrastri has on its sternites bigger, square dark markings, which are broader than high.
With S. selenitica, these markings are more rounded, and these are higher than broad.
Furthermore, selenitica usually has a black ring on the hind tibia, which is absent in pyrastri!