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The prey choice behavior and predatory strategies of two East African assassin bugs,  Scipinnia repax  (Stäl 1961) and  Nagusta  sp. (Hemiptera: Reduviidae), were investigated in the field and the laboratory. Both of these species are from the subfamily Harpactorinae and specialize in eating spiders. They prey especially often on social jumping spiders (Salticidae) that build nest complexes (nests connected by silk) in vegetation near the shoreline of Lake Victoria. Both reduviid species associate with these nest complexes and prey on the resident salticids.  Nagusta  sp., but not  S. repax , form groups on nest complexes with 2–3 individuals of  Nagusta  sometimes feeding together on a single salticid. In addition to social salticids,  Nagusta  sp. preys on  Portia africana , an araneophagic salticid that often invades the same nest complexes.  S. repax  preys on salticid eggs and also on  Nagusta . Although they avoid ants,  Nagusta  and especially  S. repax  prey on ant-mimicking salticids, suggesting that sensory modalities other than vision play a dominant role in prey detection.

Specialized Prey Selection Behavior of Two East African Assassin Bugs,Scipinnia repaxandNagustasp. that Prey on Social Jumping Spiders