Diathrausta harlequinalis
In 3 days ~20% in a week ~30%
Diathrausta harlequinalis, the harlequin webworm moth, is a moth in the family Crambidae. It was described by Harrison Gray Dyar Jr. in 1913. It is found in North America in Mexico, Arizona, California, Colorado, Connecticut, Florida, Maryland, Massachusetts, Minnesota, New Mexico, North Carolina, Oklahoma, Ontario, Quebec, South Carolina, Tennessee and Texas.
The wingspan is 13 mm. Adults have been recorded from March to October. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Big Bend National Park | 🇺🇸 United States |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Harlequin Webworm Moth sighting in Big Bend National Park on a given day, based on 9 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 221st 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 30%, if each day is a fresh chance.
September
In that month about 30% of wildlife watchers report a Harlequin Webworm Moth in Big Bend National Park on a given day, against under 5% in July–August and October–May, 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 midnight and 3 am
Across all the parks we cover, that three-hour window holds the most Harlequin Webworm Moth sightings with a recorded time, and about 9 in 10 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 Harlequin Webworm Moth sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Crambidae
The closest relatives of the Harlequin Webworm Moth 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 Harlequin Webworm Moth is recorded against all the insects logged in Big Bend National Park (9 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.
