Hemihyalea edwardsii
In 3 days ~10% in a week ~20%
Pseudohemihyalea edwardsii, or Edwards' glassy-wing, is a moth in the family Erebidae. It was described by Alpheus Spring Packard in 1864. It is found in the United States from western Oregon and the Columbia Gorge in southern Washington south to California, in the south-west east to western New Mexico. The habitat consists of oak woodlands and mixed hardwood forests at low elevations.
The length of the forewings is 27–31 mm. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Zion National Park | 🇺🇸 United States | |
| 2 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San Francisco | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report an Edwards' Glassy-Wing sighting in San Francisco on a given day, based on 125 verified sightings from GBIF citizen-science data. It is the 143rd most-seen of the 737 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
October
In that month about 10% of wildlife watchers report an Edwards' Glassy-Wing in San Francisco on a given day, against under 5% in November to September, the lowest months. That is one of San Francisco's driest months, with about 25 mm of rain against 110 mm in December.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Edwards' Glassy-Wing sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
Only San Francisco, in our data
San Francisco is the only city on Wallace's Line with enough records to rate Edwards' Glassy-Wing sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Erebidae
The closest relatives of the Edwards' Glassy-Wing that you can see in San Francisco (family Erebidae, Underwing, Tiger, Tussock, and Allied Moths) are Spotted Tussock Moth (about 10%) and Western Tussock Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Edwards' Glassy-Wing is recorded against all the insects logged in San Francisco (125 verified sightings), 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.
