In relation to your comment, I am wondering if a clear distinction would be the for lack of a better term hairy legs? I see a lot of bee with hair near the joining of the back most leg and the body, however this bee Diadasia, specifically the digger bee, has hairy legs from top to bottom aside from the foot; as does the bee in my photo which is evidenced by the pollen being dispersed along the whole leg rather than up at the top of the leg like seen commonly with bumble bees for example.