Silhouette: C. Camilo Julián-Caballero · PhyloPic
Cyclocephala borealis
In 3 days ~10%
Cyclocephala borealis, the northern masked chafer, is a beetle in the family Scarabaeidae. It is native to North America, where it is considered a crop pest. This species is native to North America, and specimens have been collected from Maine to California and as far south as Alabama.
Adult northern masked chafers are 11 to 14 mm long and 6 to 7 mm wide. They are a dull yellow-brown with darker markings on the head and eyes, and their thoraxes and wing covers are hairy. The larvae eat plant roots and other matter near the soil surface. The adults do not feed.
The life cycle of the beetle usually begins with the emergence of adults starting in mid-June. Males come to the surface of the soil after sunset, before the females emerge. After emerging from the soil the unmated females climb a blade of grass and begin to release a sex pheromone to attract males. Multiple males will sometimes crowd a female releasing such pheromones, but only one will successfully copulate after having clasped the female with his forelegs, which feature an enlarged fifth tarsal segment for this purpose. This activity will continue until a few hours before... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | New York City | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Northern Masked Chafer sighting in New York City on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 1165th most-seen of the 1623 insects we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Northern Masked Chafer in New York City on a given day, so our monthly data shows no clear season.
Only New York City, in our data
New York City is the only city on Wallace's Line with enough records to rate Northern Masked Chafer sightings: under 5% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Northern Masked Chafer is recorded against all the insects logged in New York City (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.
