The bluets form a group of about 17 similar species in Wisconsin in which the males usually share the characteristics of having blue and black stripes on the thorax, and blue and black markings on the abdomen. In-hand examinations are usually needed to identify them, although they can be grouped into subcategories based on the amount of black showing on the abdomen. Males are easily identified, under magnification, by the shape of their terminal appendages. Females are generally duller than males, and they are more difficult to identify, which is accomplished by subtle differences in the shape of the mesostigmal plates on the top of the thorax. Generally, males are bright blue while the females are green or yellow-green or blue. There are some species that are yellow-orange, a mix of various colors, or black with some blue.
The male of this species is an intermediate-type bluet because of roughly equal amounts of blue and black on the abdomen. It is similar to the familiar bluet in the field. The body length varies from 1.0 to 1.5 inches.
The tule bluet is found throughout from southern Canada to Mexico. It is very common in Wisconsin. It is usually found at rivers, lakes, and occasionally ponds.
Typical flight season is from late May to mid-September in Wisconsin.