Females have three yellow markings, including one on the clypeus. Males only have two markings!
Also, note that the head in general is very square shaped. This is different from the triangular shaped head of many other wasps, such as yellow jackets.
2. Large mandibles
Female mandibles must be big enough to grab beetles by the thorax and to move sandy soil
3. Yellow stripe on abdomen
Ok, i'll admit it! There are a lot of black and yellow wasps, so it may seem easy to confuse our friend Cerceris with a yellow jacket or a paper wasp. This single yellow stripe can help you to tell the difference. The social wasps usually have more yellow markings. Check out this image for comparison.