Butterflies and Moths of North America

collecting and sharing data about Lepidoptera

  Sighting 1305289

Western Giant Swallowtail
Papilio rumiko

Observation date: July 29, 2021
Submitted by: butterfly rose
Specimen type: Photograph
Observation notes: P. cresphontes or P. rumiko? It kept checking out these rue plants but I'm not sure if it was actually ovipositing or not.
Status: Resident
Verified by: mikefisher
Verified date: September 10, 2021
Coordinator notes: Yes...looks like P. rumiko. Cresphontes has just two yellow dots on each side of the head and tegulae (the flap over the wing hinge-point dark or only faintly yellow. You can see on the female in your photo that these areas look like a complete yellow stripe. Also the central spot band on the wings tends to be narrower on rumiko than cresphontes, especially on females. I don't think the Giant Swallowtails feed on anything but citrus or related plants...on being hoptree which can be locally cultivated (at least in SE Colorado). Mike
Checklist region(s): United States, Colorado, El Paso County