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White-spotted sawyer

Monochamus scutellatus

These beetles are recognizable by their black colour and the small white spot formed by the scutellum (the triangle at the base of the elytra). They have strong, long, reddish legs. The females are larger than the males, and their elytra (wing covers) often have small white spots. Their antennae are barely longer than their bodies, whereas the males’ antennae are twice as long as their bodies. Without their antennae, the insects vary in length from 13 to 27 mm.

The legless larvae are whitish and slightly flattened, with brown heads. They can grow to more than 4 cm long.

Red milkweed beetle

Tetraopes tetrophthalmus

These reddish-orange beetles with their black spots are easily recognizable on their host plants, milkweed. Their legs and long antennae, typical of the long-horned beetle family, are black. The species owes its Latin name to its four eyes (tetra = four), which are actually two eyes split in two by the antennae. The adults are from 8 to 15 mm long.

Long-horned beetles


These insects have long, cylindrical bodies, and antennae at least half as long as their bodies. This characteristic earned them their common name. The base of the antennae is often partly surrounded by the insect’s eyes. Many species are brightly coloured.

Worldwide, they vary in length from 0.2 to 15 cm. In North America, the largest specimens measure 6 cm.

Asian longhorned beetles

Anoplophora glabripennis

An Asian longhorned beetle is from 20 to 35 mm long. It has long black antenna, with white bands. Its black elytra are marked with about twenty irregular white spots. The scutellum is black, and its legs are black and greyish-blue.

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