Rhagium (Hagrium) bifasciatum Fabricius, 1775

Subfamilia: LEPTURINAE  /  Tribus: RHAGIINI
Rhagium bifasciatum
[Photo © Daniel Rydzi]

Rhagium bifasciatum, a widely distributed montane and submontane forest species occuring from Iberian Peninsula to Caucasus, is polyphagous in both coniferous and deciduous trees. Larvae, unlike other species of the genus, do not develop under the bark, but inside of the dead very rotten wood. Pupal cells are in the wood, sometimes directly at the surface, mostly in wood (up to 15-20 cm deep). The larval galleries are clogged by frass, and later by wooden chips up to 10 mm long. Pupation in wood at the end of summer, adults (sometimes pupae) overwinters in pupal cells. Life-cycle 2-3 years. Adults, active from April to July, almost never visit flowers and can be found on the wood (fallen, uprooted, or felled host trees etc.) [✧][❖].

Body length:♂♂ 12 - 19 mm / ♀♀ 17 - 23 mm
Life cycle:2 - 3 years
Adults in:April - July
Host plant:polyphagous in coniferous (Pinus, Picea, Larix, Abies) and deciduous trees (Alnus, Quercus, Fagus Corylus, Betula, Fraxinus, Carpinus, Populus)
Distribution:Europe except NE, Caucasus, Transcaucasia, Turkey


The depicted beetle was photographed in Karlštejn National Nature Reserve (Beroun district, Central Bohemia, Czechia) on May 8, 2019.

Collected by Daniel Rydzi


[✧]
Danilevsky M.L.:
Longicorn beetles (Coleoptera, Cerambycoidea) of Russia and adjacent countries. Part 1.
Higher School Consulting, Moscow, 550pp [pages 80-81], 2014. [download pdf icon]

[❖]
Sláma M.E.F.:
Tesaříkovití – Cerambycidae České republiky a Slovenské republiky / Cerambycidae of the Czech Republic and Slovak Republic.
Milan Sláma private printing, Krhanice, 383pp [pages 195-196], 1998 [ISBN: 80-238-2627-1]. [download pdf icon]


Rhagium bifasciatum
[Photo © Daniel Rydzi]
Rhagium bifasciatum
[Photo © Daniel Rydzi]


 
SubfamiliaLepturinae Latreille, 1802
TribusRhagiini Kirby, 1837
GenusRhagium Fabricius, 1775
SubgenusHagrium Villiers, 1978
SpeciesRhagium (Hagrium) bifasciatum Fabricius, 1775