[Photo © David Navrátil]

Rhagium caucasicum semicorne was originally described as Rhagium semicorne by Carolus Holzschuh in 1974 [❖], but Mikhail Danilevsky demoted eventually this taxon into subspecies rank in 1992 [✧]. This rare species is endemic to the mountains of the Caspian region. Martin Rejzek have recorded it from Pterocarya and Quercus but other deciduous trees will probably also serve as hosts.

Body length:	13 - 18 mm
Life cycle:	2 years
Adults in:	May - July
Host plant:	polyphagous in deciduous trees
Distribution:	Azerbaidjan, North Iran

The depicted beetles were collected on blossoming Crataegus in Raẕī (رضي‎) village environs (1900-2000 m a.s.l., Ramian County, Golestan province, Iran) on May 20 - 24, 2019.

Collected by David Navrátil

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[❖]
Holzschuh C:
Berichtigung zur Arbeit von W. Gfeller (1972) und Beschreibung einer neuen Art: Rhagium semicorne n. sp. (Coleoptera, Cerambycidae).
Mitteilungen aus der Entomologischen Gesellschaft, Basel 24 (3): 118-120, 1974.

[✧]
Danilevsky M.L.:
New species of Cerambycidae from Transcaucasia with some new data (Insecta: Coleoptera).
Senckenbergiana Biologica, Frankfurt am Main 72 (1/3): 107-117, 1992 . [download ]

Subfamilia: Lepturinae Latreille, 1802
Tribus: Rhagiini Kirby, 1837
Genus: Rhagium Fabricius, 1775
Subgenus: Megarhagium Reitter, 1913
Species: Rhagium (Megarhagium) caucasicum Reitter, 1889
Subspecies: Rhagium (Megarhagium) caucasicum semicorne Holzschuh, 1974