As previously mentioned, the Sphecoid wasps are a diverse group. Some species (commonly called the sand wasps or digger wasps) dig burrows in the ground, in which they store prey. Others, often known as mud-daubers, build nests of mud, securely attached to crevices, walls and rocks. Some merely drag their prey into crevices and leave them there after laying an egg. Most have a generally long petiole (“waist”), linking the thorax and abomen, but some species (species of Bembix and related types, for example) are fairly stout-bodied.
Follow the links for detailed information on different species of Sphecid wasps.