''Pero morrisonaria'', Morrison's pero, is a moth of the family Geometridae. It is found from Newfoundland to British Columbia, and coast to coast in northern United States, south in the east to South Carolina, south in the west to California.
The wingspan is 34–40 mm. The moth flies from May to July depending on the location.
The larvae feed on ''Abies balsamea'' and other firs, like ''Pseudotsuga menziesii'', hemlock, pine, spruce and tamarack. Furthermore, they have.. more