Osmia
lignaria
The blue orchard bee (a.k.a. orchard mason bee, Osmia lignaria)
is a solitary bee, native to North America.
This bee is about
3/8 to 5/8 inch (9 to 16 mm) in length and is a dark metallic blue. Males
are smaller than females, and have a tuft of white hairs on their face and
have longer antennae.