Electronic field guide to AQUATIC MACROINVERTEBRATES of SMALL STREAMS in Eastern Massachusetts

Inner edges of labium irregular, forming jagged line up front of head.CORDULEGASTRIDAE

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Cordulegaster

Top of head with small but obvious bump between and slightly behind eyes; margins of labium toothed but not irregular; hind legs very long, reaching far beyond end of abdomen when extended back.MACROMIIDAE

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Didymops
Head without bump on top; margins of labium regular; upper anal appendages (cerci) extremely short compared to other anal appendages (epiproct and paraprocts).

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LIBELLULIDAE (Skimmers)

Head without bump on top; margins of labium regular; upper anal appendages (cerci) roughly half as long as lower appendages (paraprocts).CORDULIIDAE.

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Somatochlora
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