Boisea rubrolineata
In 3 days ~10% in a week ~20%
Boisea rubrolineata or the western boxelder bug is identical to the eastern boxelder bug aside from having prominent red veins on its corium. It is found in western North America. Adults are 9–13 mm in length. The thorax and wings are black with red lines, and the abdomen is red. Nymphs are bright red and gray. Both nymphs and adults feed on boxelder. In fall and winter, adults might be noted migrating indoors to hibernate. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Yosemite National Park | 🇺🇸 United States | |
| 2 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Portland | 🇺🇸 United States | |
| 2 | Sacramento | 🇺🇸 United States | |
| 3 | San Francisco | 🇺🇸 United States | |
| 4 | Seattle | 🇺🇸 United States | |
| 5 | Los Angeles | 🇺🇸 United States | |
| 6 | San Diego | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Western Boxelder Bug sighting in Los Angeles on a given day, based on 28 verified sightings from GBIF citizen-science data. It is the 350th most-seen of the 851 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Western Boxelder Bug in Los Angeles on a given day, so our monthly data shows no clear season.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most Western Boxelder Bug sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
5th of 6
Of the 6 cities where we can rate Western Boxelder Bug sightings, Los Angeles ranks 5th at under 5%. The best odds are in Portland (United States, about 30%), Sacramento (United States, about 20%) and San Francisco (United States, about 10%).
GBIF citizen-science records
It is estimated from how often the Western Boxelder Bug is recorded against all the insects logged in Los Angeles (28 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.
