Butterflies and Moths of North America

collecting and sharing data about Lepidoptera

  Sighting 1312669

Black Swallowtail
Papilio polyxenes

Observation date: September 24, 2021
Submitted by: ingeniera
Specimen type: Photograph
Observation notes: I was growing fennel and golden alexanders outside. I noticed swallowtail caterpillars on the fennel, which was nearly gone with no other host plants nearby. I brought the caterpillars in and put them in my monarch cage, cutting the last of the fennel for them. I also added the 2 species of cut golden alexanders from another part of the yard. The caterpillars would have died if I hadn't. These caterpillars were small when I brought them in. Now, they are 5th instar. I noticed today that I seem to have 3 different species of swallowtails. This second photo is a mystery caterpillar, which is on the golden alexanders. This is the caterpillar that has prompted me to submit the information on the 3 types of caterpillars. I would like to know what it is.
Status: Resident
Verified by: CA Ivy
Verified date: September 24, 2021
Coordinator notes: None.
Checklist region(s): United States, Missouri, St. Louis County