Macaria bisignata
In 3 days ~10% in a week ~20%
Macaria bisignata, the redheaded inchworm, is a moth of the family Geometridae. It is found from Newfoundland to Georgia, west to Arizona, north to Ontario. The wingspan is about 25 mm (0.98 in). The moths are on wing from May to August depending on the location.
The head is reddish brown in color. A particular characteristic of markings are the 3 or 4 dark brown marks where the antemedial, medial, and postmedial lines meet costa (forewing leading edge) and by a larger, subrectangular spot where subterminal band meets costa. Another segment of subterminal band usually persists as a smaller dark spot between M3 and CuA1.
It is very similar looking to Psamatodes abydata which lacks the dark brown costa marks. The ground color (overall) of the wings ranges from light milky tan to darker gray-brown. The larva feeds on almost exclusively on pine such as Pinus strobus. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Philadelphia | 🇺🇸 United States | |
| 3 | Baltimore | 🇺🇸 United States | |
| 4 | Chicago | 🇺🇸 United States | |
| 5 | Toronto | 🇨🇦 Canada | |
| 6 | Washington | 🇺🇸 United States | |
| 7 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Red-Headed Inchworm Moth sighting in Philadelphia on a given day, based on 14 verified sightings from GBIF citizen-science data. It is the 313th most-seen of the 632 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.
August
In that month about 10% of wildlife watchers report a Red-Headed Inchworm Moth in Philadelphia on a given day, against under 5% in September to July, the lowest months.
Among the best
Of the 7 cities where we can rate Red-Headed Inchworm Moth sightings, Philadelphia ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Boston (United States, under 5%).
Same family: Geometridae
The closest relatives of the Red-Headed Inchworm Moth that you can see in Philadelphia (family Geometridae, Geometer Moths) are Chickweed Geometer Moth (about 10%), Common Tan Wave (about 10%) and Juniper Geometer Moth (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Red-Headed Inchworm Moth is recorded against all the insects logged in Philadelphia (14 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.
