Hylotrupes bajulus
In 3 days ~10% in a week ~30%
Hylotrupes is a monotypic genus of woodboring beetles in the family Cerambycidae, the longhorn beetles. The sole species, Hylotrupes bajulus, is known by several common names, including house longhorn beetle, old house borer, and European house borer. In South Africa it also is known as the Italian beetle due to their introduction to the environment by way of infested packing cases that had originated from Italy. Hylotrupes is the only genus in the tribe Hylotrupini.
This species, originating in Europe, and having been spread in timber and wood products, now has a practically cosmopolitan distribution, including Southern Africa, Asia, the Americas, Australia, and much of Europe and the Mediterranean.
Hylotrupes bajulus can reach a body length of about 8–20 mm (0.31–0.79 in), while mature larvae can reach 30 mm (1.2 in). These beetles are brown to black, appearing grey because of a fine grey furriness on most of the upper surface. On the pronotum two conspicuously hairless tubercles are characteristic of the species. On the elytra usually there are two whitish pubescent spots. Females do not have a real ovipositor, only a little more elongated telson... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Cévennes National Park | 🇫🇷 France | |
| 2 | Sierra de Guadarrama National Park | 🇪🇸 Spain |
With luck
About 10% of wildlife watchers report a House Longhorn sighting in Cévennes National Park on a given day, based on 10 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 666th most-seen of the 996 insects we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
June to August
In those months about 10% of wildlife watchers report a House Longhorn in Cévennes National Park on a given day, against under 5% in September to May, the lowest months. Those are among Cévennes National Park's driest months, with about 60 mm of rain a month against 260 mm in October.
Between 2 and 5 pm
Across all the parks we cover, that three-hour window holds the most House Longhorn sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate House Longhorn sightings, Cévennes National Park has the highest daily chance: about 10%. Next come Sierra de Guadarrama National Park (Spain, under 5%).
Same family: Cerambycidae
The closest relatives of the House Longhorn that you can see in Cévennes National Park (family Cerambycidae, Longhorn Beetles) are Spotted Longhorn Beetle (about 20%), Great Capricorn Beetle (about 20%) and Stenopterus rufus (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the House Longhorn is recorded against all the insects logged in Cévennes National Park (10 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.
