Bug FAQMorrison's Pero Moth
Pero morrisonaria · Order: Lepidoptera · Family: Geometridae
Also called: Morrison's Pero
The Morrison's Pero Moth has a wingspan of about 34 to 40 mm. It lives across Canada from Newfoundland to British Columbia and throughout the northern United States, reaching south to South Carolina in the east and California in the west. Adults are on the wing from May through July, depending on where they are found.
Source: Wikipedia
Size
Wingspan ranges from 34 to 40 mm.
Source: Wikipedia
When you see it
Flies from May to July, varying with location.
Source: Wikipedia
Where it is found in the US
Recorded in 34 of 51 states and DC. Most records: Massachusetts, Pennsylvania, Montana, Oregon, Washington, North Carolina, Michigan, Connecticut.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in Canada; native in United States. Source: iNaturalist
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
When are Morrison's Pero Moths active?
Adults are active from May through July, depending on the region.
Source: Wikipedia
Same family (Geometridae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Pero_morrisonaria
Look it up elsewhere: GBIF · iNaturalist · BugGuide · ITIS · Wikipedia
Text written 2026-10-24 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-24.