The genera here under consideration are largely western and southwestern in distribution. Little or nothing is known concerning their biology or host relationships. Characters common to both genera include the following among others: eyes bare; parafacials setose to bristled; facial ridges practically bare; epistoma narrow and somewhat elongated; arista short plumose; propleura bare; prosternum setose; apical cell closed with long petiole reaching costa far before wing tip; costal spine large; sides of postnotum beneath calypters haired.