Ethmia delliella
In 3 days ~20% in a week ~50%
Ethmia delliella, the ladder-backed ethmia moth, is a moth in the family Depressariidae. It is found from the Gulf region of Texas and Mexico to the west coastal plain of Mexico, Chiapas, El Salvador and Costa Rica. The length of the forewings is 9–12 mm (0.35–0.47 in). The ground color of the forewings is white with black markings, reflecting metallic steel blue. The ground color of the hindwings is white, becoming slightly to strongly brown toward the apex. Adults are on wing from March to October in Texas and from April to August elsewhere. There are probably multiple generations per year.
The larvae feed on Ehretia elliptica and Cordia alliodora. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cumbres de Monterrey National Park | 🇲🇽 Mexico |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Monterrey | 🇲🇽 México | |
| 2 | Austin | 🇺🇸 United States | |
| 3 | San Antonio | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Ladder-Backed Ethmia Moth sighting in Cumbres de Monterrey National Park on a given day, based on 40 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 70th most-seen of the 431 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 50%, if each day is a fresh chance.
May
In that month about 20% of wildlife watchers report a Ladder-Backed Ethmia Moth in Cumbres de Monterrey National Park on a given day, against under 5% in August and October–January, the lowest months. That is one of Cumbres de Monterrey National Park's wettest months, with about 160 mm of rain against 20 mm in December.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Ladder-Backed Ethmia Moth sightings with a recorded time, and about 7 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Cumbres de Monterrey National Park, in our data
Cumbres de Monterrey National Park is the only park on Wallace's Line with enough records to rate Ladder-Backed Ethmia Moth sightings: about 10% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Ladder-Backed Ethmia Moth is recorded against all the insects logged in Cumbres de Monterrey National Park (40 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.
