Lycia ursaria

(Walker, 1860)
Stout Spanworm

Sort #: 1972 | P #: 911083 | MPG #: 6651 | PFG Page #: 220
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Larval substrate: Deciduous trees and woody plants, incl. Acer (Maple), Alnus (Alder), Betula (Birch), Fraxinus (Ash), Malus* (Apple), Populus (Poplar), Prunus serotina* (Black Cherry), Vaccinium macrocarpon (Cranberry)
Phenology: Adult: 3/24 to 5/05 (26 records)

Comment: Females have reduced wings and cannot fly.

Status in MA (automated assessment): Restricted distribution, rare
Status in N. America: Native
MA Endangered Species Act status: None
First Year Reported: 1880
Last Year Reported: 2026

Distribution by County: Hampshire, Franklin, Worcester, Middlesex, Essex, Norfolk, Bristol
Number of Records: 46