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Hemileuca hera
Large black caterpillar with tufts of green spines on each segment and two dorsal white lines. White v shaped markings on sides.
Found on the roadside in an open conifer forest.
Feeds on sage and buckwheat. Was moving very fast across the ground.
Thanks Ornithoptera. The images for Hemileuca hera that I came across were of younger instars and did not look as much like my photo as an image that I found of electra. I did notice it wasn't listed for Colorado.