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Figure 22. Ischyrus q. quadripunctatus (Olivier) [USA, 



Florida] occipital region of head showing stridulatory 

 file (arrow) : male with stridulatory file, a.) line = 

 0.38 mm, b.) line = 0.08 mm; c.) female lacking 

 stridulatory file, line = 0.15 mm. 



