Monocesta coryli
In 3 days ~70% in a week ~90%
Monocesta coryli, the larger elm leaf beetle, is a species of skeletonizing leaf beetle in the family Chrysomelidae. It is found in eastern and southeastern North America, from Florida west to Kansas and north to Pennsylvania. It is the only species of the large neotropical genus Monocesta known to be found in the United States. Its specific epithet refers to its feeding on hazels (Corylus species), though it feeds and lives primarily on elms (Ulmus species). Adults are easily identified by their relatively large size (10 to 16 mm) and orange coloration with metallic blue-green spots, though they may also have brown spots or no spots. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Shenandoah National Park | 🇺🇸 United States |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Baltimore | 🇺🇸 United States |
Possible
About 30% of wildlife watchers report a Larger Elm Leaf Beetle sighting in Shenandoah National Park on a given day, based on 205 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 11th most-seen of the 723 insects we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.
July and August
In those months about 50% of wildlife watchers report a Larger Elm Leaf Beetle in Shenandoah National Park on a given day, against under 5% in November to April, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Larger Elm Leaf Beetle sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Shenandoah National Park, in our data
Shenandoah National Park is the only park on Wallace's Line with enough records to rate Larger Elm Leaf Beetle sightings: about 30% of wildlife watchers there report one on a given day.
Same family: Chrysomelidae
The closest relatives of the Larger Elm Leaf Beetle that you can see in Shenandoah National Park (family Chrysomelidae, Leaf Beetles) are Dogbane Leaf Beetle (about 20%), Spotted Cucumber Beetle (about 20%) and Swamp Milkweed Leaf Beetle (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Larger Elm Leaf Beetle is recorded against all the insects logged in Shenandoah National Park (205 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.
