Acalolepta sejuncta, a North-East Asian species occuring in Russian Far East, Japan, Korean peninsula and North China, has been described from Japan (Nagasaki/Hiogo environs) as Monohammus sejunctus by Henry Walter Bates in 1873 [▽].

A. sejuncta, inhabiting North-East Asian deciduous and mixed forest zones, is polyphagous species attacking both deciduous and coniferous trees. Its larvae develop in trunks of weaekened living trees and shrubs. Youg larvae feed subcortically, creating in sapwood slightly impressed galleries filled with fine frass. Later instars enter the wood and bore gallery finished by pupal cell (after the second overwintering) where they also pupate. Life cycle 2 years. Adults, active from July to September, can be found on the host trees [✧].

Body length:	14 - 20 mm
Life cycle:	2 years
Adults in:	July - September
Host plant:	polyphagous in both coniferous and decidous trees (Ulmus, Sorbus, Phellodendron, Picea, Clerodendrum, Sambucus, etc.)
Distribution:	Russian Far East (Sakhalin, Kunashir), Korean peninsula, Japan, North China

The depicted female (19 mm) was collected in Grozovoe (Грозовое) settlement environs on Cape Ivanovsky (N43°50′28″ E145°24′29″), Kurils Nature Reserve, Kunashir/Кунаши́р island, Kuril Islands, Yuzhno-Kurilsky district, Sakhalin region, Russia) on September 1-3, 2013.

Collected by Yu.Sudnikov and L.Sudnikova

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[▽]
Bates H.W.:
On the Longicorn Coleoptera of Japan.
The Annals and Magazine of Natural History, London (4) 12 (70): 308-318, 1873. [download ]

[✧]
Cherepanov A.I.:
Cerambycidae of Northern Asia, Volume 3 - Laminae Part I.
Amerind Publishing, New Delhi: 300pp [pages 172-179], 1990. [download ]