Utah State University Extension
The lilac-ash borer (Podosesia syringae), belongs to a group of insects known as the clear-winged moths. The wings of most sesiid moths in have at least partially transparent wings (devoid of the colored scales that coat most moth and butterfly wings).
Davis, Ryan S.; Beddes, Taun; and Karren, Jay B., "Lilac-Ash Borer" (2010). All Current Publications. Paper 921.