Toxomerus marginatus
In 3 days ~40% in a week ~80%
Toxomerus marginatus, also known as the margined calligrapher fly, is a common species of hoverfly. It is found in many parts of North America. The larvae are predators of thrips, aphids, and small caterpillars. Adults feed on a wide range of flowers. Smith & Chaney 2007 finds T. marginatus is the most numerous of the Syrphidae species controlling aphids in lettuce fields on California's Central Coast.Toxomerus marginatus are commonly found in cranberry fields. This species of syrphid is highly attracted to the plant volatile methyl salicylate, which is a floral compound as well as being an herbivore-induced plant volatile.
5–6 mm (0.20–0.24 in) The face is whitish yellow and thinly pollinose. It is expanded forward and downwards, with a yellow facial tubercle that is yellow pilose. The gena is black and yellow pilose. The frontal triangle is yellow, and the vertical triangle is black, both with black pilose. The antennae are reddish yellow and a little brownish gray above, with a black arista. The eye has a distinct triangular emargination on the posterior margin at or above the level of the antenna, is bare. The occiput is black and silvery... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Acadia National Park | 🇺🇸 United States | |
| 2 | Badlands National Park | 🇺🇸 United States | |
| 3 | Great Smoky Mountains National Park | 🇺🇸 United States | |
| 4 | Shenandoah National Park | 🇺🇸 United States | |
| 5 | Point Pelee National Park | 🇨🇦 Canada | |
| 6 | Gros Morne National Park | 🇨🇦 Canada | |
| 7 | Riding Mountain National Park | 🇨🇦 Canada | |
| 8 | Big Bend National Park | 🇺🇸 United States | |
| 9 | Redwood National Park | 🇺🇸 United States | |
| 10 | Channel Islands National Park | 🇺🇸 United States | |
| 11 | Joshua Tree National Park | 🇺🇸 United States | |
| 12 | Rocky Mountain National Park | 🇺🇸 United States | |
| 13 | Yellowstone National Park | 🇺🇸 United States | |
| 14 | Cumbres de Monterrey National Park | 🇲🇽 Mexico |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Minneapolis [Saint Paul] | 🇺🇸 United States | |
| 3 | Sacramento | 🇺🇸 United States | |
| 4 | New York City | 🇺🇸 United States | |
| 5 | Washington | 🇺🇸 United States | |
| 6 | Baltimore | 🇺🇸 United States | |
| 7 | Tijuana | 🇲🇽 México | |
| 8 | Detroit | 🇺🇸 United States | |
| 9 | Chicago | 🇺🇸 United States | |
| 10 | Dallas | 🇺🇸 United States |
Possible
About 20% of wildlife watchers report a Margined Calligrapher sighting in Sacramento on a given day, based on 251 verified sightings from GBIF citizen-science data. It is the 17th most-seen of the 386 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 80%, if each day is a fresh chance.
September and October
In those months about 30% of wildlife watchers report a Margined Calligrapher in Sacramento on a given day, against under 5% in December to February, the lowest months. Those are among Sacramento's driest months, with about 15 mm of rain a month against 120 mm in December.
Between 10 am and 1 pm
Across all the parks we cover, that three-hour window holds the most Margined Calligrapher sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 31 cities where we can rate Margined Calligrapher sightings, Sacramento ranks 3rd at about 20%, level with the leaders once rounded. The best odds are in Boston (United States, about 20%) and Minneapolis [Saint Paul] (United States, about 20%).
GBIF citizen-science records
It is estimated from how often the Margined Calligrapher is recorded against all the insects logged in Sacramento (251 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.
