Eyes are dramatically reduced in size comprising of approximately 100 ommatidia and an area occupied by cuticle, hairs and bristles. Projection of an additional third antennal segment tissue at the base of the arista. Arista are reduced in size. Labial palps may lack one of the pseudotracheal rows. All legs lack tarsal claws. Extra male sex comb teeth. Wings are reduced to proximal held out stumps and halteres do not have capitella. Pleural defects. Female analia is variable in size. Male analia is variable in presence and orientation and genitalia is absent.