Wasps
The apoid wasps include the thread-waisted and crabronid wasps. Generally harmless to humans, though they often look more intimidating than they really are.
Read MoreThread-waisted wasp feeding on nectar -- I believe it's a great black wasp (Sphex pensylvanicus) based on the size and time of year.
waspthreadwaisted waspsphexgreat black waspblack waspblackflowernectardrinkinggatheringfeedinginsectanimalmacronature