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1.         Eyes in dorsal view widest just anterior to middle (using posterolateral corner of eye as                         posterior  limit of measurement); lateral margins of head just behind eye nealy                                     straight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aeshna umbrosa

            Eyes in dorsal view widest at or just posterior to middle; lateral margins of head just behind             eye distinctly convex. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aeshna canadensis

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