Pyrausta pseudonythesalis
In 3 days ~20% in a week ~40%
Pyrausta pseudonythesalis, the Shasta pyrausta moth, is a moth in the family Crambidae. It was described by Eugene G. Munroe in 1976. It is found in North America, where it has been recorded from California, Nevada, Arizona, New Mexico and Texas. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Big Bend National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Austin | 🇺🇸 United States | |
| 2 | Monterrey | 🇲🇽 México | |
| 3 | San Antonio | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Desert Pyrausta sighting in Big Bend National Park on a given day, based on 14 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 141st most-seen of the 329 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
September
In that month about 30% of wildlife watchers report a Desert Pyrausta in Big Bend National Park on a given day, against under 5% in May–June and October–March, the lowest months. That is one of Big Bend National Park's wettest months, with about 50 mm of rain against 10 mm in April.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Desert Pyrausta sightings with a recorded time, and nearly all of them come between 6 pm and 6 am: it is mostly seen at night.
Only Big Bend National Park, in our data
Big Bend National Park is the only park on Wallace's Line with enough records to rate Desert Pyrausta sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Crambidae
The closest relatives of the Desert Pyrausta that you can see in Big Bend National Park (family Crambidae, Crambid Snout Moths) are Four-Spotted Palpita Moth (about 10%), Yellow-Veined Moth (about 10%) and Hawaiian Beet Webworm Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Desert Pyrausta is recorded against all the insects logged in Big Bend National Park (14 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.
