Fissicrambus mutabilis
In 3 days ~10% in a week ~20%
Fissicrambus mutabilis, the changeable grass-veneer or striped sod webworm, is a moth of the family Crambidae. It is found from Quebec to Florida, west to Texas and Illinois and north to Ontario. The wingspan is about 17 mm. Adults are on wing from June to August in two generations per year.
The larvae feed on various grasses. Partly grown larvae overwinter. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Chicago | 🇺🇸 United States | |
| 2 | Philadelphia | 🇺🇸 United States | |
| 3 | Dallas | 🇺🇸 United States | |
| 4 | New York City | 🇺🇸 United States | |
| 5 | Austin | 🇺🇸 United States | |
| 6 | Washington | 🇺🇸 United States | |
| 7 | Toronto | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Changeable Grass-Veneer sighting in Philadelphia on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 432nd 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 Changeable Grass-Veneer 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 Changeable Grass-Veneer sightings, Philadelphia ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Chicago (United States, under 5%).
Same family: Crambidae
The closest relatives of the Changeable Grass-Veneer that you can see in Philadelphia (family Crambidae, Crambid Snout Moths) are Celery Leaftier Moth (about 10%), Lucerne Moth (about 10%) and Elegant Grass-Veneer (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Changeable Grass-Veneer is recorded against all the insects logged in Philadelphia (8 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.
