hindwing

In butterflies there is no frenulum, but a costal outgrowth of the 466 hindwing subserves the same function.

The sub-costal nervure of the hindwing is usually present and distinct from the radial nervure.

The maxillae are well developed, the hindwing has a frenulum, and its sub-costal nervure touches the radial near the base.

The maxillary palps are absent or vestigial, and a frenulum is usually present on the hindwing.

The hindwing carries a frenulum and has its sub-costal nervure connected with the radial by a short bar.