Parrhasius m-album
In 3 days ~20% in a week ~40%
Parrhasius m-album, or the white M hairstreak, is a species of butterfly of the family Lycaenidae. It is found in the United States from western Connecticut to southeast Iowa, southern Missouri to east Texas, the Gulf Coast, and peninsular Florida. On rare occasions some stray to Michigan and Wisconsin.
The wings are often iridescent near the bottom. The females are larger than the males in this species. The wingspan of Parrhasius m-album is 32–41 mm. The larvae feed on Quercus virginiana and other Quercus species. the larvae appear a light green color. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Washington | 🇺🇸 United States | |
| 2 | Philadelphia | 🇺🇸 United States | |
| 3 | New York City | 🇺🇸 United States | |
| 4 | Dallas | 🇺🇸 United States | |
| 5 | Boston | 🇺🇸 United States | |
| 6 | Houston | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a White M Hairstreak sighting in Shenandoah National Park on a given day, based on 18 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 234th most-seen of the 723 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.
April
In that month about 20% of wildlife watchers report a White M Hairstreak in Shenandoah National Park on a given day, against under 5% in May–June and October–March, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most White M Hairstreak sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate White M Hairstreak sightings, Shenandoah National Park has the highest daily chance: about 10%. Next come Great Smoky Mountains National Park (United States, under 5%).
Same family: Lycaenidae
The closest relatives of the White M Hairstreak that you can see in Shenandoah National Park (family Lycaenidae, Gossamer-winged Butterflies) are Elkalyce comyntas (about 20%), American Copper (about 20%) and Cyaniris neglecta (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the White M Hairstreak is recorded against all the insects logged in Shenandoah National Park (18 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.
