Evening to all,
this is an older sighting and it seems in my lay eyes to be a male I. stramentor but that is only because i don't see what the pitfalls are.
size: I don't know
male: because of black antennae and black abdomen.
colourdivision on legs seems to fit this species but i'm happy to admit that these are too hard to tell apart just by a lousy set of images.
details of this sighting can be found here: http://waarneming.nl/waarneming/view/77912990?_popup=1