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Three species are known to North America. These are medium sized dragonflies
and usually slender in appearance. The thorax is narrow, the
dark brown or black abdomen is thickened
at the base and slender at the middle segments and can vary in shape depending upon
species. It is generally adorned with small yellow spots or
2 larger spots on segment.Wings may develop brown bands at
the base or on the tips, depending upon the individuals age
and sex. Coloration similar in both sexes.
In many species, individuals of both sexes sometimes gather
in open areas and fly together for awhile, moving slowly and
with "small leaps" along short stretches of water.
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