Ennomos subsignaria, the elm spanworm moth, is a moth of the family Geometridae. It is found from Texas to Alberta and east to the Atlantic coast. It is recorded infrequently in Great Britain through accidental importation in asparagus. The wingspan is 35–40 mm. Adults are pure white except for yellow branches on the antennae. They are on wing from late May to August. one generation per year. The larvae feed on elm, apple, birch, maple, and oak.