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1.         First antennal segment greatly elongate, as long as the combined length of the remaining                         segments; prementum with deep, open median cleft; lateral caudal gills triangular in                         cross section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Calopterygidae

            First antennal segment not so elongate, distinctly less than the combinded length of the                         remaining segments; prementum usually without a median cleft, rarely with a small                         closed cleft; lateral caudal gills flat to round in cross section . . . . . . . . . . . . . . . . . . . . 2

2.         Prementum distinctly petiolate (stalked) and spoon-shaped, the narrow proximal part as long as             or longer than the expanded distal part; movable hook of each palpal lobe with 2 or 3 setae;             usually 5-8 dorsal premental setae on each side of median lline (when only 4 or 5 prementals             present, then with only 3 palpal setae). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Listidae

            Prementum not distinctly petiolate, more or less triangular or subquadrate in shape; movable             hook of each palpal lobe without setae; dorsal premental setae 0-3 on each side of median line             (some Coenagrionidae with 4 or 5 premental setae have 5-6 palpal setae). . . . . . . . . . . . . . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Coenagrionidae       

 

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