About Cerceris fumipennis Say, 1837
Cerceris fumipennis Say, 1837 can be identified by five distinct, noticeable features. First, it is a large wasp, roughly the same size as common yellow jacket wasps. Second, its wings are dark, smoky, and blue-black in color. Third, its body is mostly black, with only a small number of yellow markings. Fourth, it has a clearly visible single broad creamy yellow band across its abdomen. Fifth, facial markings differ by sex: females have three creamy patches between the eyes, while males have two yellow triangles that sit directly against their eyes.
