21a
(20b). Hind wings with anal area
nearly always enlarged and forming a lobe, which is folded
like a fan at rest;
venation varying from normal to very dense, the front wings usually with
several cross veins between
Cu-1 and M and between Cu-1 and Cu-2 (Fig. A); cerci
present and often fairly
long; mostly 10 mm or more in length; nymphs aquatic, and adults
usually near water (Figs.A-F)
[stoneflies]..........................................................................Plecoptera
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A B C D
E F
21b. Hind wings without an enlarged anal area and not folded at
rest; venation normal or
reduced, with no
extra cross veins; short cerci present or absent; mostly 10 mm in length
or less; nymphs not aquatic
and adults not regularly near
water.........................................…....... 22