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Books about Promachus:
Athena: Parthenos/Promachus by Huck Fairman (Sep 11, 2014)
Robberflies Of The Genera Promachus And Proctacanthus by James Stewart Hine (Apr 10, 2012)
Wiki information Promachus:
Promachus is a genus of robber flies. It is part of the subfamily Asilinae.