Adela trigrapha
In 3 days ~20% in a week ~30%
Adela trigrapha is a moth of the family Adelidae or fairy longhorn moths. It was described by Zeller in 1876 and is found in western North America, from Vancouver Island to California. The length of the forewings is 5.5–6.2 mm. Adult males have large eyes and long white antenna (three times the forewing length). The forewings are black and usually crossed by three white lines. Females are smaller and have smaller eyes and antennae. They have a bright orange head. The forewings are bright metallic blue and the hindwings are purple.
The larvae possibly feed on Leptosiphon androsaceus and Leptosiphon bicolor. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Channel Islands National Park | 🇺🇸 United States |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Three-Striped Longhorn sighting in Channel Islands National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 117th most-seen of the 131 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.
March and April
In those months about 10% of wildlife watchers report a Three-Striped Longhorn in Channel Islands National Park on a given day, against under 5% in May to February, the lowest months. Those are among Channel Islands National Park's wettest months, with about 35 mm of rain a month against almost none in July.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Three-Striped Longhorn sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Only Channel Islands National Park, in our data
Channel Islands National Park is the only park on Wallace's Line with enough records to rate Three-Striped Longhorn sightings: about 10% of wildlife watchers there report one on a given day.
Same order: Lepidoptera
The closest relatives of the Three-Striped Longhorn that you can see in Channel Islands National Park (order Lepidoptera, Butterflies and Moths) are Salt Marsh Moth (about 30%), Lophocampa indistincta (about 30%) and Monarch (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Three-Striped Longhorn is recorded against all the insects logged in Channel Islands National Park (5 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.
