Adult beetles are 8–30 mm long reddish-brown to black, while males are generally smaller and lighter in colour.
The body is elongated and oval, typical for longhorn beetles. The head angles forward, showing most of the mouth parts. The thread-like antennae are half to three-quarters of the body length, longer in males. The prothorax is smoothly curved with no spines, narrower than the elytra. The elytra have four ridges and slightly tapering sides.
Eggs are white, opaque, and cigar-shaped, measuring about 0.5 by 1.8 mm. Creamy white larvae are cylindrical, with noticeable legs and pointed jaws. Larvae are active when removed from their tunnels.
Arhopalus ferus prefers dead or dying Pinus and Picea injured by fire or other damage but rarely it will develop in healthy trees. Females are attracted to volatiles from burnt trees or sawmills.
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