Butterflies and Moths of North America

collecting and sharing data about Lepidoptera

  Sighting 1143790

Joined Underwing Moth
Catocala junctura

Observation date: August 22, 2017
Submitted by: BOGwalker
Specimen type: Photograph
Observation notes: This was by far the largest underwing moth I have ever seen! It was on aphid infested Canada thistle. Is it possible that it was obtaining nourishment from the aphids, as do other insects?
Status: Resident
Verified by: J_Martineau
Verified date: September 28, 2017
Coordinator notes: I've never seen or heard of them utilizing aphid honeydew, but don't see why they wouldn't. Sugar baits are known to be good for attracting C. junctura. I live in Sheridan and observed many this species this year, though none that high in elevation.
Checklist region(s): Sheridan County, United States, Wyoming