hammertail

== English == === Etymology === From hammer + tail. === Noun === hammertail (plural hammertails) Any of the genus Efferia of large, often dull-colored robber flies, the males of which have a mallet-like appendage at the ends of their abdomens. ==== Translations ==== === References === Efferia on Wikipedia.Wikipedia Efferia on Wikispecies.Wikispecies Category:Efferia on Wikimedia Commons.Wikimedia Commons