Table of Families — Part 4

Wings alike, held vertically in repose; eyes constricted at base, peduncled. . . . . 1

Front wings dissimilar from hind wings, held horizontally in repose; eyes not peduncled. . . . . 2

1--Wings with at least five cross veins between the first and second longitudinal veins and before the first break in the wing (antecubitals). . . . . Family Calopterygidae

Wings with but two such cross veins. . . . . Family Agrionidae

2--Antecubitals of the first and second rows not meeting except at base of wing. . . . . 3

Antecubitals of first and second rows running into each other. . . . . 4

3--Eyes wide apart. . . . . Family Gomphidae

Eyes touching at a single point. . . . . Family Cordulegasteridae

Eyes touching for some distance. . . . . Family Aeschnidae

4--Eyes with tubercles behind. . . . . Family Cordulidae

Eyes not tubercled behind. . . . . Family Libellulidae