Rhagium bifasciatum
In 3 days ~20% in a week ~30%
Rhagium bifasciatum, sometimes called the two-banded longhorn beetle, is one of the most common longhorn beetles in Europe, Turkey and the Caucasus, although it is absent from the far north-east of Europe and some offshore islands, such as Malta. It may reach 22 millimetres (0.87 in) long and can be distinguished by the two prominent pale yellow bands on each of the elytra, although up to seventeen different patterns have been recognised.
Like other longhorn beetles, R. bifasciatum lays its eggs in dead wood, mostly of coniferous trees, where they bore deep, broad tunnels until they are ready to pupate after about two years. The adults feed on a wide variety of coniferous and broad-leaved trees. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cairngorms National Park | 🇬🇧 United Kingdom | |
| 2 | Snowdonia National Park | 🇬🇧 United Kingdom | |
| 3 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 4 | Triglav National Park | 🇸🇮 Slovenia | |
| 5 | Sierra de Guadarrama National Park | 🇪🇸 Spain | |
| 6 | Wadden Sea National Park | 🇩🇪 Germany |
With luck
About 10% of wildlife watchers report a Two-Banded Longhorn Beetle sighting in Sierra de Guadarrama National Park on a given day, based on 13 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 258th most-seen of the 597 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 September
In those months about 10% of wildlife watchers report a Two-Banded Longhorn Beetle in Sierra de Guadarrama National Park on a given day, against under 5% in July–August and October–April, the lowest months.
Between 1 and 4 pm
Across all the parks we cover, that three-hour window holds the most Two-Banded Longhorn Beetle 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 parks where we can rate Two-Banded Longhorn Beetle sightings, Sierra de Guadarrama National Park ranks 5th at about 10%. The best odds are in Cairngorms National Park (United Kingdom, about 30%), Snowdonia National Park (United Kingdom, about 20%) and Bavarian Forest National Park (Germany, about 10%).
Same family: Cerambycidae
The closest relatives of the Two-Banded Longhorn Beetle that you can see in Sierra de Guadarrama National Park (family Cerambycidae, Longhorn Beetles) are Stictoleptura stragulata (about 10%), Fairy-Ring Longhorn Beetle (about 10%) and Iberodorcadion perezi (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Two-Banded Longhorn Beetle is recorded against all the insects logged in Sierra de Guadarrama National Park (13 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.
