Proserpinus terlooii
In 3 days ~10% in a week ~30%
Proserpinus terlooi, the Terloo sphinx moth, is a moth of the family Sphingidae first described by Henry Edwards in 1875. It is found from southern Arizona to Sonora in Mexico. The wingspan is 42–48 mm. There is one generation per year with adults on wing in July and August. Adults fly during the very late afternoon or evening, nectaring from flowers.
The larvae feed on Boerhavia species (including Boerhavia coccinea and Boerhavia coulteri). Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Saguaro National Park | 🇺🇸 United States |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Terloo Sphinx sighting in Saguaro National Park on a given day, based on 57 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 176th most-seen of the 354 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.
July and August
In those months about 10% of wildlife watchers report a Terloo Sphinx in Saguaro National Park on a given day, against under 5% in September to June, the lowest months. Those are among Saguaro National Park's wettest months, with about 50 mm of rain a month against almost none in May.
Between 6 and 9 pm
Across all the parks we cover, that three-hour window holds the most Terloo Sphinx sightings with a recorded time, and about 6 in 10 of them come between 6 am and 6 pm: it is seen both by day and at night.
Only Saguaro National Park, in our data
Saguaro National Park is the only park on Wallace's Line with enough records to rate Terloo Sphinx sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Sphingidae
The closest relatives of the Terloo Sphinx that you can see in Saguaro National Park (family Sphingidae, Sphinx Moths) are White-Lined Sphinx (about 20%), Rustic Sphinx (about 10%) and Carolina Sphinx (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Terloo Sphinx is recorded against all the insects logged in Saguaro National Park (57 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.
