Dolichopodidae
(aquatic longlegged
flies) head reduced to a few dark rods; abdomen may have prolegs present in the form of small welts
Sciomyzidae
(marsh flies, humpbacked flies) Tubular body with head capsule retracted into thorax; abdominal
segments encircled with a ring of bumps; end of abdomen is blunt with several small
lobes around the edges.