Spilomyia alcimus
In 3 days ~10% in a week ~20%
Spilomyia alcimus, the Broad-banded Hornet Fly, is an uncommon species of syrphid fly first officially described by Walker in 1849. Hoverflies get their names from the ability to remain nearly motionless while in flight. The adults are also known as flower flies for they are commonly found around and on flowers, from which they get both energy-giving nectar and protein-rich pollen. The larvae are known as the short-tailed larvae suited for moist areas such as rot holes of trees. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | New York City | 🇺🇸 United States | |
| 3 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 4 | Toronto | 🇨🇦 Canada | |
| 5 | Chicago | 🇺🇸 United States | |
| 6 | Washington | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Broad-Banded Hornet Fly sighting in Boston on a given day, based on 18 verified sightings from GBIF citizen-science data. It is the 583rd most-seen of the 1200 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.
July
In that month about 10% of wildlife watchers report a Broad-Banded Hornet Fly in Boston on a given day, against under 5% in August to June, the lowest months.
Yes
Of the 6 cities where we can rate Broad-Banded Hornet Fly sightings, Boston has the highest daily chance: under 5%. Next come New York City (United States, under 5%) and Minneapolis [Saint Paul] (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Broad-Banded Hornet Fly is recorded against all the insects logged in Boston (18 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.
