Subject: What kind of nest is this
Location: Hudson, NH
February 15, 2014 12:33 pm
I found these today in the slots in my window were my screen would go. I only have half screens so the top never has anything in it.
We believe this is the nest of a Grass Carrying Wasp in the genus Isodontia. According to BugGuide: “Females make nests in a tree, hollow stem or other cavity, divide into sections and close with grass. They provision with Orthoptera (Tettigoniidae, Gryllidae)” and “These wasps commonly make their nest in the narrow track found above outer windows.” We cannot tell if the nest in your photo has been provisioned with Crickets. The female Grass Carrying Wasp paralyzes the cricket which remains immobile, but alive, as the wasp larva feeds upon it.