Struggling with staphs

So I've been trying to ID a bunch of staphs that I have left over from last season and I must admit to having mixed success. They certainly aren't easy. Well at least for me!

Take this one for instance

I think this a Xantholinus sp. At 8mm and with microstructure (but not too strong microstructure) it keys out as Xantholinus gallicus - but there aren't many records on NBN and I guess I'll need to wait and compare to some known specimens in a collection somewhere.

Someone somewhere reading this will be asking what the $%£@ is microstructure?

So glad you asked.....

You can make it out at about 40x magnification but it's the very fine structure (in this case) on the pronotum

Microstructure of Xantholinus gallicus (credit http://www.micropics.org.uk/) 

Pretty nifty when you see it well.