This seems to have rather yellow hind tarsi, which makes it more likely to be Chloromyia speciosa. The wings also appear to be quite darkened which would fit with this ID.

Tanks very much! I must admit my ignorance, I posted this photo in the forum last year and was told about formosa. I'll send a message to the administrator to correct the id.

Actually, I checked my key at the time (it was my identification) and that gave the colour of the mid and hind metatarsus for formosa as brownish and for speciosa as 'conspicuously yellowish'. I would call this brownish. Wing colour can be a bit tricky with some backgrounds. Yet a third character, the colour of the hairs above the antennae (black), speaks in favour of C. speciosa. Good catch, Tony.