Needed to crack a window during a woodstove cleanout and accidentally uncovered these larvae. I hope I didn't hurt them.
South facing window
Photo update 22April2020
Photo update 5May2020
Buffalo Creek Wildlife Management Area (http://nebwild.org/projects/buffalo-creek-wma.php) (http://nebwild.org/projects/maps.php)
Fleisbach Wildlife Management Area (Facus Springs) (http://nebraskabirdingtrails.com/chet-and-jane-fleisbach-wildlife-management-area/)