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Terms

1.        Cerci with dorsal or dorsal-ventral intercalary hairs, at least on apical half (Fig. 2.6.1) .            . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..Alloperla

           Cerci without dorsal or dorsal-ventral intercalary hairs (Fig. 2.6.2); setae inserted only            at apex of cercal segments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.        Thick, depressed black clothing hairs present on all thoracic sterna (Fig. 2.6.3).            Mesosternal Y-arms well developed (Fig. 2.6.4). . . . . . . . . . . . . . . . . . . . . . . Sweltsa

           Thick, depressed black or other hairs absent from thoracic sterna (Fig. 2.6.5) . . . . . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Haploperla brevis

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