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

Rear corners of head angular; anal appendages curve inwards, middle appendage (epiproct) with shallow notch; very common, found in all kinds of streams

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Boyeria

Rear corners of head angular; anal appendages curve inwards, middle appendage (epiproct) deeply forked; found in ponds and large streams

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Basiaeschna
Rear corners of head rounded; cerci straight; most are pond dwellers

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Aeshna

Rear corners of head rounded; large, more than 4 cm when mature; found in wetlands, ponds, large streams, etc

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Anax
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