Pleuroprucha insulsaria
In 3 days ~20% in a week ~30%
Pleuroprucha insulsaria, the common tan wave moth, is a moth of the family Geometridae that was first described by Achille Guenée in 1857. It is found in eastern North America, from Nova Scotia to Florida, west to Texas and Colorado and north to Ontario. It ranges south through Mexico and Central America into South America (including Venezuela) and has been recorded as far south as the Galápagos Islands. It has also been recorded from the West Indies, including Jamaica.
The wingspan is 14-21 mm. Adults are on wing from March or April to October in the southern part of the range. In the north, adults have been recorded from June to October. The larvae feed on a wide range of plants, including Solanum dulcamara, Galium, Zea mays, Solidago, Castanea, Quercus and Salix species. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States | |
| 2 | Acadia National Park | 🇺🇸 United States | |
| 3 | Great Smoky Mountains National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Austin | 🇺🇸 United States | |
| 2 | Dallas | 🇺🇸 United States | |
| 3 | Baltimore | 🇺🇸 United States | |
| 4 | Chicago | 🇺🇸 United States | |
| 5 | Washington | 🇺🇸 United States | |
| 6 | Philadelphia | 🇺🇸 United States | |
| 7 | Boston | 🇺🇸 United States | |
| 8 | Houston | 🇺🇸 United States | |
| 9 | Toronto | 🇨🇦 Canada | |
| 10 | New York City | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Common Tan Wave sighting in Philadelphia on a given day, based on 35 verified sightings from GBIF citizen-science data. It is the 156th most-seen of the 632 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.
June to September
In those months about 10% of wildlife watchers report a Common Tan Wave in Philadelphia on a given day, against under 5% in October to May, the lowest months.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Common Tan Wave sightings with a recorded time, and about 8 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Among the best
Of the 13 cities where we can rate Common Tan Wave sightings, Philadelphia ranks 6th at about 10%, level with the leaders once rounded. The best odds are in Austin (United States, about 10%), Dallas (United States, about 10%) and Baltimore (United States, about 10%).
Same family: Geometridae
The closest relatives of the Common Tan Wave that you can see in Philadelphia (family Geometridae, Geometer Moths) are Chickweed Geometer Moth (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 Common Tan Wave is recorded against all the insects logged in Philadelphia (35 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.
