I personally find that using these groupings, and learning characteristics of both the adults, and particularly nymphs, within them, can help narrow your identification choices when you collect an unfamiliar species. For now its best to call them all Gomphus . The drawings of female vulver lamina with XX over them are not correct representations, but those of other species used as place holders until I can find representations for those species. Sides of the thorax green with narrow stripes. Top of thorax mostly blackish, with narrow yellow markings.
Females have a longer more attenuated vulvar lamina.
This species is shorter and stockier than G. descriptus . A dark species with greenish yellow sides of thorax. Yellow markings on top of the thorax are wider, and more extensively yellow on the sides of the last four abdominal segments. A very dull colored species, mostly greenish, brown, and yellow. Conspicuously larger and darker than G. exilis .