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21. Clypeus (a1-a3) set off by distinct sutures, and shape strongly modified: semicircular in shape (a1), several times broader than long (a2), or strongly protruding (a3).

many Omphale Haliday, 1833

21'. Clypeus either not set off by sutures (aa1) or set off by faint sutures (aa2) but shape unmodified: length about equal to width, not strongly protruding or distinct from face in any other way (a different color from rest of face in a few species).

couplet 22

a1

a2

 a3
omphale face1.JPG (19173 bytes) omphale face2.JPG (21855 bytes) omphale_face3.JPG (19370 bytes)

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aa1 aa2

chrysocharis idyia face.JPG (14069 bytes)

chrysonotomyia face.JPG (14483 bytes)

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Image credits: a1-3: Hansson (1996a). aa1: Hansson (1987). aa2: Hansson (1994b).