Parasitism of<i>Neoconocephalus</i>katydids by the parasitoid fly,<i>Ormia lineifrons</i>

Abstract Mating signals of insects do not only attract their intended receivers but also eavesdropping parasites and/or predators. As a result, an arms race between the host or prey and eavesdropper ensues, propelling co‐evolution potentially contributing to diversification. Here, we investigate species interaction fly Ormia lineifrons that uses Neoconocephalus katydids as hosts for its lethal larvae. We surveyed use O . over 2‐year period in Kentucky determined which were used hosts, parasitism rate each katydid host, how many generations per year displays. Four six parasitized killed ( triops , velox robustus nebrascensis ) by Three these previously known be Two either bivocatus retusus even though was active when they called. The peaked 38% 100% across years. had three distinct year, generation different hosts. discuss importance synchronization with well potential counteradaptations These semi‐independent races could provide valuable insights diversification parasitoid.