Swallowtail Chrysalis probably Pale Swallowtail

Subject: moth?
Location: Vancouver BC Canada
October 29, 2016 9:56 am
They seem to be stationary over 2 days, they seem not to have even moved
I am an arborist and found them on a young ash tree, could they be feeding on the sap?
They are about 2 inches or 5 cm long and the photo taken in late October 2016
Signature: Richard Lange

Swallowtail Chrysalis
Swallowtail Chrysalis

Dear Richard,
This is the Chrysalis of a Swallowtail Butterfly in the genus
Papilio.  Since you are an arborist and you were able to identify the tree, we suspect this is the Chrysalis of a Pale Swallowtail, a species with a caterpillar that feeds on the leaves of Ash and other trees, and that ranges in your area.  According to BugGuide:  “Larvae feed on foliage of woody plants in several families: Rosaceae (cherry, e.g., Prunus emarginata, Holly-leaved Cherry, Prunus ilicifolia), Rhamnaceae (California Coffee-berry, Rhamnus californica, Ceanothus spp.), Oleaceae (ash, Fraxinus) and Betulaceae. Overwinters as pupa, adults emerge in spring. Males seek hilltops for mating.”  Based on the BugGuide information, you will have to wait for spring to see the adult Pale Swallowtail emerge.

Thank you so much for your fast reply
Kind Regards
Richard Lange – Tree MD®

Leave a Comment