ex Populus alba https://www.inaturalist.org/observations/238025027
Zitterpappel
Gualala River, South Fork, larvae on willow leaves.
Highwood Pass trail head parking lot; heavy infestation on willow shrubs.
Note the lack of pigment in the spots on the male. I found a second pair where the female had weak spots and the male was very dark.
These were all found on Populus balsamifera. According to https://www.zin.ru/animalia/coleoptera/pdf/clark_ledoux_et_al_2004.pdf
this is the preferred host for C. falsa. C. mainensis is primarily found on Alnus sp.