Confidence: I'm as sure as I can be.
Notes: A fresh looking male solitary bee, the relative length of the antennae are a clues to its sex. From the photo, the best ID is "Andrena sp.". Going by the overall look, colour and time of year I would guess at Andrena haemorrhoa. Without looking at some more detailed photos including the tail and the back of the thorax it is not really possible to get to a definate ID from the photo.