Polystepha pilulae
In 3 days ~20% in a week ~40%
Polystepha pilulae, the oak leaf gall midge, is a species of gall midge in the family Cecidomyiidae. It is found in eastern North America. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 2 | Shenandoah National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 3 | Dallas | 🇺🇸 United States | |
| 4 | Washington | 🇺🇸 United States | |
| 5 | Detroit | 🇺🇸 United States | |
| 6 | New York City | 🇺🇸 United States | |
| 7 | Philadelphia | 🇺🇸 United States | |
| 8 | Chicago | 🇺🇸 United States | |
| 9 | Baltimore | 🇺🇸 United States | |
| 10 | Toronto | 🇨🇦 Canada |
With luck
About 10% of wildlife watchers report an Oak Leaf Gall Midge sighting in Boston on a given day, based on 90 verified sightings from GBIF citizen-science data. It is the 188th most-seen of the 1200 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.
July to October
In those months about 10% of wildlife watchers report an Oak Leaf Gall Midge in Boston on a given day, against under 5% in November to June, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Oak Leaf Gall Midge 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 10 cities where we can rate Oak Leaf Gall Midge sightings, Boston has the highest daily chance: about 10%. Next come Minneapolis [Saint Paul] (United States, about 10%) and Dallas (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Oak Leaf Gall Midge is recorded against all the insects logged in Boston (90 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.
