Falcate, scythe-shaped; a flat body curved, its edges parallel.
Wings rather short, falcate, pointed, the second primary longest.
There is a falcate dorsal fin; but the head in outline is not Rorqual-like in spite of its similar proportions.
Setae numerous; the appendage short, falcate, with tip simple, but a slender tooth near middle of curved edge.
Prickles straightish or falcate, slender or strong, without bristles.
In the genus Pontoporia the dorsal fin is well developed and falcate.
"Skull with marked but rounded supra-orbital ridges continued into temporal ridges; coronoid process high and falcate" (Alston).
The dorsal fin was relatively small, falcate, and obtusely terminated.
This Falcate Orange-tip is one of the daintiest and most exquisite of northern butterflies.
Front outer angle of each front wing projecting into a falcate tip.