Mason Bee House trays
We are consulting other experts on the identification of this larvae. We will provide an answer as soon as possible. Thank you for using Ask an Expert!
Thank you for your patience. Larval identification is difficult!
Experts at Utah State University and Oregon State University agree that it is larvae from the potter wasp (also called a mason wasp) (Vespidae: Eumeninae). They prey on caterpillars.
Thank you for using Ask an Expert!