Observation notes: Columbia silkmoth seemed to be the best match from photo gallery. Only historic records from our area! The caterpillar was feeding on bitterbrush (Purshia tridentata). Since the first sighting on 7/26, the caterpillar has remained in the same area. As of 7/29, it has moved down into a mix of small western juniper and bitterbrush and is weaving a cocoon.
Verified by: davidwdroppers
Verified date: March 28, 2021
Coordinator notes: ID based on bitterbrush being a favorite host plant in the region and far more records of euryalus from that area. H. gloveri/columbia may be found rarely there, but I have no clues about distinguishing larvae