Flat bugs living inside pouch fungus conks

These flat bugs, family Aradidae, were living and breeding inside the fruiting bodies of pouch fungus. Flat bugs are fungus feeders and they found a good home here. The images show adults and nymphs.

Specimens collected by Ryles Richards, 7 August 2017, Groveland California, from dead pine trees along a road. Thanks to Dr. Lynn Kimsey for the ID.