220a (219a).    Third and 4th antennal segments laterally fan-like........... (Strepsiptera)  Callipharixenidae

 

 

220b.    Only 3rd antennal segment laterally fan-like (Figs.A-C)..…..........…........(Strepsiptera)  Stylopidae

 

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                                       A                                       B                                          C