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Hello Sundew,

In Lyneborg's 1986 key it easy to get confused between P. melaleuca and P. caesia. For P. caesia males he gives the following account: "Abdomen in dorsal and caudal views dull black- ish, only silvery white tomentose on lateral parts of tergites". Now this is very difficult to judge. Fortunately I've now seen material of both species and lots of photo's. The vague blackness in the middle of the tergites makes this P. caesia. Also the habitus of P. melaleuca is far more silverish, compact and it misses the yellow wing base. For examples see photo's of;
P. caesia: https://waarnemin...003555.jpg and
P. melaleuca: https://waarnemin...283267.jpg

Kind regards,
Ectemnius