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2. Propodeum with a single median carina that may have an anterior cup (ie: a split carina converging or merging posteriorly).

couplet 3

2'. Propodeum with two submedian carinae or a split median carina, diverging posteriorly

couplet 4

a1

aa1
platyplectrus scutellum.JPG (30126 bytes) alveoplectrus scutellum.JPG (34609 bytes)

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aa2

euplectromorpha scutellum.JPG (40841 bytes)

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Image credits: a1, aa2: Boucek (1988). aa1: Schauff, et al. (1997).