What is "polygonia progne"

Progne \Prog"ne\, n. [L., a swallow, traditionally said to be fr. Progne (The sister of Philomela), who was changed into a swallow, Gr. ?.] (Zo["o]l.)

1. A swallow.

2. A genus of swallows including the purple martin. See Martin.

3. An American butterfly ( Polygonia Progne or Vanessa Progne). It is orange and black above, grayish beneath, with an L-shaped silver mark on the hind wings. Called also gray comma.

The Gray Comma or Grey Comma (Polygonia progne) is a species of Polygonia that occurs in North America.