A large, active, blue-black wasp with irridescent blue wings. Frequents flowers for nectar and buildings for nest sites. Compare "Steel-Blue Cricket Hunter", (or "Blue Mud Dauber"), Chlorion aerarium
, which preys on crickets. This is about the same size as Chalybion, and is said to have a longer pedicel (narrow waist between thorax and abdomen). The body of Chalybion
looks much more hairy, and more steely-blue, based on specimen photos.