Chilocorus stigma
In 3 days ~10% in a week ~20%
Chilocorus stigma, commonly known as the twice-stabbed ladybug, is a native resident of the United States and Canada. It also has been introduced to Hawaii. It is shiny black, and there is one red spot on each elytron. The remainder of the body is black as well, but the abdomen is either yellow or red. It is sometimes confused with the "two-stabbed lady beetle", Chilocorus orbus, which is widespread in California.
C. stigma mainly lives within terrestrial/arboreal habitats, primarily feeding on aphids found in these habitats as well as scales (such as pine needle scale, beech bark scale and Florida red scale) and mealybugs. It is a beneficial insect, and is useful in both natural wood stands and commercial forests such as orchards and citrus groves. It is beneficial against non native species. An introduced Hemlock pest, the elongate hemlock scale (Fiorinia externa Ferris), which has been doing considerable damage to Hemlock trees throughout North America, can be moderately controlled by the presence of C. stigma. C. stigma is currently not a lady beetle that can be sold for commercial use in orchards or on farms.
Chilocorus... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Point Pelee National Park | 🇨🇦 Canada |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Boston | 🇺🇸 United States | |
| 2 | Detroit | 🇺🇸 United States | |
| 3 | Toronto | 🇨🇦 Canada | |
| 4 | Salt Lake City | 🇺🇸 United States | |
| 5 | Baltimore | 🇺🇸 United States | |
| 6 | Philadelphia | 🇺🇸 United States | |
| 7 | Denver | 🇺🇸 United States | |
| 8 | Montreal | 🇨🇦 Canada | |
| 9 | Houston | 🇺🇸 United States | |
| 10 | Minneapolis [Saint Paul] | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Twice-Stabbed Lady Beetle sighting in Denver on a given day, based on 10 verified sightings from GBIF citizen-science data. It is the 274th most-seen of the 461 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
In that month about 10% of wildlife watchers report a Twice-Stabbed Lady Beetle in Denver on a given day, against under 5% in April to February, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Twice-Stabbed Lady Beetle sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
7th of 15
Of the 15 cities where we can rate Twice-Stabbed Lady Beetle sightings, Denver ranks 7th at under 5%. The best odds are in Boston (United States, about 10%), Detroit (United States, under 5%) and Toronto (Canada, under 5%).
Same family: Coccinellidae
The closest relatives of the Twice-Stabbed Lady Beetle that you can see in Denver (family Coccinellidae, Lady Beetles) are Seven-Spotted Lady Beetle (about 20%), Convergent Lady Beetle (about 20%) and Asian Lady Beetle (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Twice-Stabbed Lady Beetle is recorded against all the insects logged in Denver (10 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.
