En Paco´s Nature Reserve
unfortunately this one took off before I could get a better shot
San Diego County, California, US
The Sphecidae (Latreille, 1802) are a cosmopolitan family of wasps that include digger wasps, mud daubers, and other familiar types that all fall under the category of thread-waisted wasps. Both of the traditional definitions of the Sphecidae (the conservative one, where all the sphecoid wasps other than ampulicids and heterogynaids were in a single large family, and the more refined one, where the seven large sphecid subfamilies were each elevated to family rank) have recently been...