Emesaya brevipennis is a New World species of assassin bug in the subfamily Emesinae. There are three subspecies, all of which occur in North America north of Mexico.
The subspecies Emesaya b. brevipennis is the most widely distributed and is reported to be bivoltine in Southern Illinois. This subspecies has 5 instars.
E. brevipennis has been reported to rob spiders of their preyHoward, L. O. 1901. The insect book. Doubleday. Page and Co. New York. and to prey upon spiders.Smith. J. B. 1910. A report of the insects of New Jersey-Hemiptera. Annual Report of the New Jersey State Museum, p. 131-170. The species also will prey upon conspecifics, both in the larval and adult stage.
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