The Sphecidae are a cosmopolitan family of wasps of the suborder Apocrita that includes sand wasps, mud daubers, and other thread-waisted wasps.
The name Sphecidae was formerly given to a much larger grouping of wasps. This was found to be paraphyletic, so most of the old subfamilies have been moved to the Crabronidae.
Digger wasps come in all sizes and colors. Some are yellow and black striped, black, blue, brown, white and orange, yellow, and probably mixes of all these colors. In general, they will use the same area of the yard over and over until you get rid of the local population. Because the young are deep down in the soil developing most of the year out of sight, its easy to misunderstand where they come from and how to best control an active population. This article will help explain their behavior as well as list the best products available for controlling an active or on going problem.