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12. Petiole transverse, without longitudinal ribs. In most species, median groove of scutellum (a1) extending more than half scutellar length. Mesopleuron (b1) without epicnemial carina (although diagonal mesopleural sulcus extending from mesocoxa is present).

Horismenus Walker, 1843

12'. Petiole longer than broad, with longitudinal ribs (bb1). Median groove of scutellum (aa1) extending less than half scutellar length. Mesopleuron with epicnemial carina (bb1, indicated by arrow).

Edovum Grissell, 1981

a1

b1
horismenus bennetti scutellum.JPG (20676 bytes) horismenus pleuron.JPG (24038 bytes)

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aa1

edovum_dorsal.jpg (437266 bytes)

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bb1

edovum_pleuron2.jpg (296320 bytes)

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Image credits: a1: Schauff (1987). b1: Schauff (1991).