Microtheoris ophionalis
In 3 days ~20% in a week ~40%
Microtheoris ophionalis, the yellow-veined moth, is a moth in the family Crambidae. It was described by Francis Walker in 1859. It is found from southern Canada, through the United States and Mexico to South America. The length of the forewings 5.5–7 mm. Adults are on wing from May to October in the northern part of the range. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Big Bend National Park | 🇺🇸 United States | |
| 2 | Saguaro National Park | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Yellow-Veined Moth 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 131st 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 20% of wildlife watchers report a Yellow-Veined Moth in Big Bend National Park on a given day, against under 5% in November to February, 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 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Yellow-Veined 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.
Yes
Of the 2 parks where we can rate Yellow-Veined Moth sightings, Big Bend National Park has the highest daily chance: about 10%. Next come Saguaro National Park (United States, under 5%).
Same family: Crambidae
The closest relatives of the Yellow-Veined Moth that you can see in Big Bend National Park (family Crambidae, Crambid Snout Moths) are Four-Spotted Palpita Moth (about 10%), Hawaiian Beet Webworm Moth (about 10%) and Belted Grass-Veneer (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Yellow-Veined Moth 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.
