[2] Ischnoceros rusticus is an ichneumonid parasitoid wasp that feds on Rhagium mordax larvae.

[5] The beetles' bodies are covered with small yellow hairs,[6] although one distinguishing feature of the species is two bald spots on its elytra.

[7] Rhagium mordax has a long, narrow head with a distinct neck.

The insect's face bears a suture and the temples are elongate with some stiff hairs.

The antennae are relatively short and the first segment is wider at its tip and longer.