Published online by Cambridge University Press: 31 May 2012
This North American genus was erected in 1864 by Loew who based his description on specimens collected in New Hampshire. The species of this genus are readily separated from those of any other chironomid genus by the presence of a median longitudinal fissure on the mesonotum. The nonplumose male antennae are also quite characteristic of this group, although this condition obtains also in the genus Hydrobaenus Fries. At present five species are known, to which are now added three new species.