Megachile willughbiella – Willughby’s Leafcutter
I think that the ID on this is right and that it is the chap mapering over the cells of my bee-house this year (2014). It is very similar to the other Megachile sp. described on this site last year… but I wouldn’t dare put money on it. Anyone looking at this site who has entomological skills PLEASE offer an opinion on this or any other ID I posit on this Blog.
It is a large leafcutter bee, but females can be difficult to identify, even under a microscope!