Carpenter Bees - Xylocopa spp.
   Description of the life cycle and habits of this group of bees, with a photo and advice on coping with them. From Clemson University.
   http://entweb.clemson.edu/creatures/crptrbee.htm

Xylocopa spp. - Large Carpenter Bees
   Biology, distribution, identification, economic importance, and management, with reference list and images. From state of Florida.
   http://creatures.ifas.ufl.edu/misc/bees/xylocopa.htm