Rhaphuma diminuta diminuta, a nominotypic subspecies occuring in Russia (Far East), Japan and Korea, has been described from Japan (Nagasaki environs) as Clytanthus diminutus by Henry Walter Bates in 1873 [❖]. The species, inhabiting deciduous forests of Far East, is ecologically associated with deciduous trees and strubs. Its larvae develop in dead or dying twigs/shoots (up to diameter 1.5 cm), feed subcortically creating deeply impressed galleries in sapwood and fill them compactly by frass. Mature larvae penetrate the wood forming a pupal cell with an exit corridor clogged with sawdust. Pupation in the end of summer, beetles hatch in August-September and overwinter in the wood (life-cycle 2 years). Adults, active from May to July (peak in June), are diurnal and anthophilous [✧].

Body length:	4 - 8 mm
Life cycle:	2 years
Adults in:	May - July
Host plant:	polyphagous on deciduos trees (Carpinus, Quercus, Ulmus, Corylus, Corylus, Syringa)
Distribution:	Russia (Far East), Japan and Korea

Depicted female beetle (6.5 mm) was collected at Listvennichnaya (Лиственничная) river under of Kamenystyi (Каменистый) creek estuary (N43°35′47″ E131°21′53″; 400 m a.s.l, Borisovskoye Plateau, South of Primorsky krai, Far Eastern Federal District, Russia) on May 30, 2019.

Collected by Kirill V. Makarov

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[❖]
Bates H.W.:
On the Longicorn Coleoptera of Japan.
The Annals and Magazine of Natural History, London (4) 12 (69): 193-201, 1873. [download ]

[✧]
Cherepanov A.I.:
Cerambycidae of Northern Asia, Volume 2 - Cerambycinae Part II.
Amerind Publishing, New Delhi: 354pp [pages 256-262], 1988. [download ]