Temnostoma excentricum
In 3 days ~10% in a week ~30%
Temnostoma excentrica (Harris, 1841 ), the Black-spotted Falsehorn, is a common species of syrphid fly observed throughout the United States and Canada. Hoverflies can remain nearly motionless in flight. The adults are also known as flower flies for they are commonly found on flowers, from which they get both energy-giving nectar and protein-rich pollen. Temnostoma adults are strong wasp mimics. The larvae burrow in moist decayed wood. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Elk Island National Park | 🇨🇦 Canada | |
| 2 | Acadia National Park | 🇺🇸 United States | |
| 3 | Great Smoky Mountains National Park | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Temnostoma excentricum sighting in Acadia National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 347th most-seen of the 405 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
June and July
In those months about 10% of wildlife watchers report a Temnostoma excentricum in Acadia National Park on a given day, against under 5% in August to May, the lowest months.
Between noon and 3 pm
Across all the parks we cover, that three-hour window holds the most Temnostoma excentricum sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 3
Of the 3 parks where we can rate Temnostoma excentricum sightings, Acadia National Park ranks 2nd at under 5%. The best odds are in Elk Island National Park (Canada, about 10%).
Same family: Syrphidae
The closest relatives of the Temnostoma excentricum that you can see in Acadia National Park (family Syrphidae, Hover Flies) are Margined Calligrapher (about 20%), Eastern Calligrapher (about 20%) and Common Drone Fly (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Temnostoma excentricum is recorded against all the insects logged in Acadia National Park (6 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.
