Stenodema pilosa
In 3 days ~20% in a week ~30%
Stenodema pilosa is a species of plant bug in the family Miridae, first described in 1889. It can be found across transcontinental North America Eurasia.[1] Species within the genus Stenodema are elongate with a longitudinal furrow between the eyes and are best distinguished by the coarsely and densely pitted prothorax. S. pilosa is about 8–9 mm long and has three spurs on the hind femora. This distinguishes it from other closely related species, notably S. calcarata which has two femoral spurs.
There are two generations per year. Adults which have overwintered and mated in the spring are green with an orange-brown hourglass marking down their back, and those born later in the year are beige or tan. Males are often darker than females.[2]
This species has been found across transcontinental North America Eurasia and is commonly observed in grassy fields and wetlands. Stenodema pilosa feeds on grasses such as the meadow foxtail, reed canary grass and common reed. They overwinter as adults and emerge in April, and the new generation is complete by August.
Formerly treated as a separate species, S. trispinosa was synomized... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Helsinki | 🇫🇮 Finland | |
| 2 | Baltimore | 🇺🇸 United States | |
| 3 | Montreal | 🇨🇦 Canada | |
| 4 | Philadelphia | 🇺🇸 United States | |
| 5 | New York City | 🇺🇸 United States | |
| 6 | Washington | 🇺🇸 United States | |
| 7 | Boston | 🇺🇸 United States | |
| 8 | Toronto | 🇨🇦 Canada |
With luck
About 10% of wildlife watchers report a Three-Spined Grass Bug sighting in Helsinki on a given day, based on 22 verified sightings from GBIF citizen-science data. It is the 280th most-seen of the 838 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–June and August–September
In those months about 10% of wildlife watchers report a Three-Spined Grass Bug in Helsinki on a given day, against under 5% in July and October–April, the lowest months.
Yes
Of the 8 cities where we can rate Three-Spined Grass Bug sightings, Helsinki has the highest daily chance: about 10%. Next come Baltimore (United States, under 5%) and Montreal (Canada, under 5%).
GBIF citizen-science records
It is estimated from how often the Three-Spined Grass Bug is recorded against all the insects logged in Helsinki (22 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.
