Grown on exposed Rubus.
Probably heard-only. Could have easily been mimicry from lesser though.
My 5th specimen. The leftmost beetle in the composite comparison of 3. It is similar in size to my original Coniontis (lower right) but is not as wide and is shinier (not a trick of the light, this is a consistent difference). The texture is also more broken up than the aforementioned one.
The small one at the top is the specimen originally located on this observation: http://www.inaturalist.org/observations/1391688
The lower right larger one is at http://www.inaturalist.org/observations/1359783