Immatures:
*body usually long & slender.
*three leaf-like gills at rear of abdomen.
Adults:
*antennae short & bristle-like .
*compound eyes large,often covering most of the head.
*four membraneous wings with many longitudinal & cross veins
*base of wings narrow , stalk-like
*one distinctively pigmented cell (stigma) on leading edge of wing
*abdomen : long & slender.
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