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7. Propodeum (a1) with 2 submedian carinae connected at middle, forming an H- or X-shaped structure.

Stenomesius Westwood, 1833

7'. Propodeum (aa1) with 1 median carina that may have a basal cup but never splits posteriorly, or without complete median or submedian carinae.

couplet 8

a1

aa1
stenomesius propodeum.JPG (24877 bytes) Elachertus propodeum.JPG (28019 bytes)

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Image credits: a1: Schauff, et al. (1997). aa1: Schauff (1985b).