Rivula propinqualis
In 3 days ~20% in a week ~30%
Rivula propinqualis, the spotted grass moth or yellow snout-moth, is a moth of the family Erebidae. The species was first described by Achille Guenée in 1854. It is found throughout eastern North America from southern Canada southward to Florida and Texas and westward in the north to British Columbia and Washington. In North Carolina it is found from the Appalachian Mountains to the Atlantic coast.
The wingspan is 15–19 mm. Adults are on wing from May to August. The larvae feed on various grasses. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Baltimore | 🇺🇸 United States | |
| 2 | Washington | 🇺🇸 United States | |
| 3 | Toronto | 🇨🇦 Canada | |
| 4 | Chicago | 🇺🇸 United States | |
| 5 | Montreal | 🇨🇦 Canada | |
| 6 | Dallas | 🇺🇸 United States | |
| 7 | New York City | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Spotted Grass Moth sighting in Shenandoah National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 363rd most-seen of the 723 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
May and August–September
In those months about 10% of wildlife watchers report a Spotted Grass Moth in Shenandoah National Park on a given day, against under 5% in June–July and October–April, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Spotted Grass Moth sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Only Shenandoah National Park, in our data
Shenandoah National Park is the only park on Wallace's Line with enough records to rate Spotted Grass Moth sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Erebidae
The closest relatives of the Spotted Grass Moth that you can see in Shenandoah National Park (family Erebidae, Underwing, Tiger, Tussock, and Allied Moths) are Spongy Moth (about 40%), Isabella Tiger Moth (about 30%) and Hickory Tussock Moth (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Spotted Grass Moth is recorded against all the insects logged in Shenandoah National Park (10 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.
