The Common Angle moth has a wingspan of about .75 inch. The forewing has a sickle-shaped indentation along the outer margin. It is tan to pale brown with 3 yellowish-brown transverse lines and a large dark brown marking along the post median line that is actually made up of 5 separate spots. The hindwing is pointed and a similar color of the forewing, but lacks the dark markings. The terminal lines are dashes on all wings. The larva is green with whitish lines. Some have 2 black spots on the second segment.
The frequency of occurrence at Fontenelle Forest and Neale Woods is not known. The individual shown here was photographed at Fontenelle Forest Nature Center in early April. The adults are attracted to artificial lights.
This species was formerly named Semiothisa aemulataria. The larvae eat the leaves of maples.
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