One of 20 Nearctic species in the genus.
Average size 7.6 centimeters.
Lateral thoracic stripes straight and narrow; Frontal thoracic stripes long and narrow. Abdominal segment ten is black. Female has a slender abdomen, constricted sharply at segement three. Female has a long ovipositor.
Northeastern U.S. and Southeastern Canada. Also a smaller disjunct population in far northwestern U.S. and far Southwestern Canada.
Ponds and lakes, with a preference for acidic ones; also found along streams.
Female has two forms, one with blue abdominal spots, the other (scarcer) with yellow spots.