He has a distinctive yellow face, which may be seen while he is in flight. Female bees have no interest other than collecting food. They have a stinger and their face is black. Carpenter bees are commonly mistaken for bumble bees. There are two differences.
Carpenter bees are generally larger.
Carpenter bees have an abdomen which is shiny, metallic and black in color. Their abdomen has no body hair. Bumblebees have yellow and black body hair on all body parts. Old nests are used year after year. If the original nest is occupied, other female bees will drill new ones.