Defensive-buzzing
Guides
Cimbex americanus
elm sawfly, North American Elm Sawfly
Cimbex americanus, commonly known as the elm sawfly, is a large, non-stinging sawfly in the family Cimbicidae. Adults measure approximately 20–30 mm in body length and are among the largest sawflies in North America. The species exhibits sexual dimorphism in coloration: males have yellow-orange abdomens, while females display black abdomens with yellow transverse bands. Larvae feed on foliage of various broadleaf trees, particularly elm and willow, and can reach 50 mm in length. The species has a single generation per year, with larvae overwintering in soil cocoons before pupating in spring.