Amphion floridensis
In 3 days ~10% in a week ~20%
Amphion floridensis, the Nessus sphinx, is a day-flying moth of the family Sphingidae. The species was described by Pieter Cramer in 1777, and renamed in 1920. It is the only member of the genus Amphion erected by Jacob Hübner in 1819. It lives throughout the eastern United States and Canada and occasionally south into Mexico, and is one of the more commonly encountered day-flying moths in the region, easily recognized by the two bright-yellow bands across the abdomen.
The Nessus sphinx has reddish median bands on its hindwings and two prominent horizontal yellow stripes and a tail feather-like hair tuft on abdomen of both sexes. The wingspan is 37–55 mm. It has a stout body and reddish-brown upperside wings, and in some individuals the hindwings may have pale to absent median band or a yellow spot on the costal margin.
Found in the Eastern United States from Maine to Florida and as far west as Colorado.. The Canadian range extends from the southeast corner of Manitoba to Nova Scotia. Found in deciduous and mixed woodlands, cultivated orchards, along streams, and in suburbs with sufficient tree cover.
Adults are on... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 2 | Shenandoah National Park | 🇺🇸 United States | |
| 3 | Cumbres de Monterrey National Park | 🇲🇽 Mexico |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Detroit | 🇺🇸 United States | |
| 2 | Denver | 🇺🇸 United States | |
| 3 | Chicago | 🇺🇸 United States | |
| 4 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 5 | Austin | 🇺🇸 United States | |
| 6 | Philadelphia | 🇺🇸 United States | |
| 7 | Washington | 🇺🇸 United States | |
| 8 | New York City | 🇺🇸 United States | |
| 9 | Boston | 🇺🇸 United States | |
| 10 | Toronto | 🇨🇦 Canada |
Rare
Under 5% of wildlife watchers report a Nessus Sphinx sighting in Cumbres de Monterrey National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 344th most-seen of the 431 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.
March and April
In those months about 10% of wildlife watchers report a Nessus Sphinx in Cumbres de Monterrey National Park on a given day, against under 5% in May to February, the lowest months.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Nessus Sphinx sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 3
Of the 3 parks where we can rate Nessus Sphinx sightings, Cumbres de Monterrey National Park ranks 3rd at under 5%. The best odds are in Great Smoky Mountains National Park (United States, about 10%) and Shenandoah National Park (United States, about 10%).
Same family: Sphingidae
The closest relatives of the Nessus Sphinx that you can see in Cumbres de Monterrey National Park (family Sphingidae, Sphinx Moths) are Walnut Sphinx (about 10%), White-Lined Sphinx (about 10%) and Florestan Sphinx (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Nessus Sphinx is recorded against all the insects logged in Cumbres de Monterrey 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.
