20a
(18b). Tarsi with 4 segments; front
and hind wings similar in size, shape and venation
(Figs.A-E) cerci tiny or absent
[termites]...............................................…........................Isoptera
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A B C D E
20b. Tarsi with 3 or less segments; hind wings usually shorter than
front wings; cerci either
present or absent....................................................................................................…................…............
21