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Photo#1426981
Insect or cocoon? - Papilio polyxenes

Insect or cocoon? - Papilio polyxenes
Martinsville, Morgan County, Indiana, USA
August 19, 2017

ID success!
David F, thank you for the info! Indeed, yesterday the chrysalis had a hole in the side and its occupant was gone! We will keep our eyes open for a Black Swallowtail in the flower garden!

It is a Black Swallowtail pupa / chrysalis - Papilio polyxenes
Pipevine Swallowtail pupae look similar, but have larger flattened projections along the back. And indeed P. zelicaon is very closely similar (and probably this species' closest relative), but is found way to the west from Indiana.

It might stay there all winter and emerge in the spring, but it could do it within a couple of weeks of when it formed. This species has more than one brood in a year (at least two; more as you move south), it could emerge almost right away. Mid August is getthing late, but early enough that some will probably still emerge this year. Towards the end of the summer though, almost all of them overwinter, and the few that don't - normally - don't live very long (rarely there will be a long mild prolonged autumn, and they can sneek in one last generation of caterpillars later than they should be able to). Some of the pupae in any generation will wait until the next year (or even several years) to emerge, while others will do so right away as long as there is enough time left in the season.

Moved from ID Request.

Similar to this Papilio pupa


Not an ID, don't know if others look similar

 
Butterfly chrysalis
You are correct! Thank you, John R. I believe we have identified this as a chrysalis of a Black Pipevine Swallowtail butterfly. It's attached to the side of a barn. According to the info we read, it could be there all winter! Appreciate your reply!

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