Pyrrhia exprimens
In 3 days ~10% in a week ~20%
Pyrrhia exprimens, the purple-lined sallow, is a moth of the family Noctuidae. The species was first described by Francis Walker (entomologist) in 1857. In North America it is found from Newfoundland and Labrador west across southern Canada to southern Vancouver Island, south to Texas, Arizona and California. Outside of North America it is found in Finland, the West Siberian Plain, the South Siberian Mountains and Kazakhstan.
The wingspan is 35–38 mm. Adults are on wing from May to August. The larvae feed on Polygonum species and Aconitum septentrionale as well as a wide variety of other plants. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Purple-Lined Sallow sighting in Great Smoky Mountains National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 628th most-seen of the 822 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
May and July
In those months about 10% of wildlife watchers report a Purple-Lined Sallow in Great Smoky Mountains National Park on a given day, against under 5% in June and August–April, the lowest months.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Purple-Lined Sallow sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Only Great Smoky Mountains National Park, in our data
Great Smoky Mountains National Park is the only park on Wallace's Line with enough records to rate Purple-Lined Sallow sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Noctuidae
The closest relatives of the Purple-Lined Sallow that you can see in Great Smoky Mountains National Park (family Noctuidae, Cutworm Moths and Allies) are Beautiful Wood-Nymph (about 20%), Hebrew Moth (about 10%) and American Dagger (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Purple-Lined Sallow is recorded against all the insects logged in Great Smoky Mountains National Park (7 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
