Ptilobactrum

There is one  myrmecophilous species in this genus. They have very broad heads and their basoflagellomeres are elongate and densely pilose in males. Ptilobactrum was erected by Bezzi (1915: 136) for a Microdon species which had a very broad head and the basoflagellomere was elongate and densely pilose in the male. Cheng and Thompson (2008) considered it as a synonym of Microdon (Microdon) without seeing the species.