Flight: late June to late October (early November)
This species is very similar to the Common Darter but in both sexes the black line between the eyes extends down the sides of the frons (face).
Mature male: a deeper red with the tiny black spots on the abdomen ringed with yellow. The sides of the thorax without clear yellow panels.
Female: yellow-orange without a waist. There is a distinctive, prominent vulvar scale which sticks out at a right angle from under segment 9, at the end of the abdomen.