Monobia quadridens
In 3 days ~20% in a week ~30%
Monobia quadridens, also known as the four-toothed mason wasp, is a species of solitary potter wasp (subfamily Eumeninae) found in North America. It grows to a wingspan of 18 mm (0.71 in), and feeds on small caterpillars and pollen. Two generations occur per year, with one generation overwintering as pupae.
The abdomen of M. quadridens is entirely black, except for a broad ivory-coloured band on the first tergite. The wingspan is typically 11.0–14.5 mm (0.43–0.57 in) for males, and 14–18 mm (0.55–0.71 in) for females. It closely resembles Euodynerus bidens in size and colouration.
Monobia quadridens has a wide distribution in eastern North America. In Mexico, it is found in the states of Tamaulipas and Nuevo León, while in the United States, it is found from New Mexico, Kansas, and Wisconsin east to the Eastern Seaboard. The occurrence of the species in Canada has been recorded by Buck (2008 https://cjai.biologicalsurvey.ca/bmc_05/pdf/bmc05.pdf) and specimens identified as M. quadridens have been present in Canadian entomological collections for a long time.
Monobia quadridens was first described by Carl Linnaeus in his 1763 work... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Point Pelee National Park | 🇨🇦 Canada | |
| 2 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 3 | Shenandoah National Park | 🇺🇸 United States | |
| 4 | Everglades National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Baltimore | 🇺🇸 United States | |
| 2 | Boston | 🇺🇸 United States | |
| 3 | Washington | 🇺🇸 United States | |
| 4 | Philadelphia | 🇺🇸 United States | |
| 5 | New York City | 🇺🇸 United States | |
| 6 | Toronto | 🇨🇦 Canada | |
| 7 | Houston | 🇺🇸 United States | |
| 8 | Dallas | 🇺🇸 United States | |
| 9 | Detroit | 🇺🇸 United States | |
| 10 | Austin | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Four-Toothed Mason Wasp sighting in Shenandoah National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 363rd most-seen of the 723 insects we can rate there. Over three days the chance rises to about 20%, and over a week to about 30%, if each day is a fresh chance.
May, July and September–October
In those months about 10% of wildlife watchers report a Four-Toothed Mason Wasp in Shenandoah National Park on a given day, against under 5% in June, August and November–April, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Four-Toothed Mason Wasp sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 4 parks where we can rate Four-Toothed Mason Wasp sightings, Shenandoah National Park ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Point Pelee National Park (Canada, about 10%) and Great Smoky Mountains National Park (United States, about 10%).
Same family: Eumenidae
The closest relatives of the Four-Toothed Mason Wasp that you can see in Shenandoah National Park (family Eumenidae) are Guinea Paper Wasp (about 10%), Northern Paper Wasp (about 10%) and Metric Paper Wasp (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Four-Toothed Mason Wasp is recorded against all the insects logged in Shenandoah National Park (10 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.
