Utah State University Extension
The larval stage of the carpenterworm, Prionoxystus robiniae is a wood-boring insect that affects various ornamental trees. Unlike most other wood-boring pests of ornamentals, which are mostly beetle larvae, the carpenterworm is a caterpillar belonging to the moth family Cossidae.
Karren, Dr. Jay B. and Roe, Alan H., "Carpenterworm" (2002). All Current Publications. Paper 871.