Longhorn beetles - Cerambycidae

Cerambycidae longhorn beetles

The Cerambycidae family contains the longhorn beetles. There are 35,000 species world wide, and 60 species in Britain. Many species are pests of commercial forests giving then their other common name of timber beetles. Most adults have antennae that are at least half as long as their body, and may be as much as 3 or 4 times as long. Adult body length ranges from 6 - 75 mm long. They usually have long, narrow bodies and long legs. The adults feed on sap, pollen and nectar, and are often very beautiful, but their larvae (below) tunnel in wood eating as they go. The larvae are fleshy and cylindrical. Their head can be retracted into the thorax. Their legs are tiny and cannot be seen from above.

The females usually lay their eggs under the bark of the host tree, and the larval life cycle can take several years to complete.

Cerambycidae larva, longhorn beetle larva On the left typical longhorn (Cerambycidae) beetle larva.

Aromia moschata, the musk beetle.

Aromia moschata (right) adults measure 13 - 35 mm long, and they get their name because they smell of roses. The adults are a beautiful metallic blue/green, and are found from May - September. As is common with most Cerambycidae the male has longer antennae than the female. The larvae are found in willows, and can take over 3 years to reach maturity.

Aromia moschata, the musk beetle, a longhorn, family Cerambycidae

Stenocorus meridianus, Variable longhorn

On the right is and adult Stenocorus meridianus (also known as Stenochorus meridianus), also in the Cerambycidae family.

The adult is black, or brown and black, with red or black legs and antennae. In the U. K. the adults can be seen in May and June, usually at woodland edges, often on flowers as they eat the pollen, but they tend to be restricted to southern England. They are 15 - 25 mm long, with the females being much larger than the males, much broader in the body, and darker in colour.

The larvae eat the wood of damaged or diseased deciduous trees.

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Stenocorus meridianus, lonhorn beetle adult
Rhagium bifasciatumRhagium sp. larva, longhorn beetle larva

Rhagium bifasciatum the Two-banded longhorn.

The adult has 2 distinct whitish/yellowish marks on the side of each elytron, and a less distinct reddish one between; these marks do vary, but are rarely absent. The adult ranges in size from 12 - 22 mm long. The adults are seen from May to August on flowers and host trees.

The larva (below)feeds in decaying fir stumps (Scots pine mainly), and will occasionally attack deciduous trees. On the right is the larva of Rhagium sp., possibly bifasciatum, as it was found in the same area.

Strangalia quadrifaciata

Strangalia quadrifaciata on the left is a beautiful beetle found in Europen woods, but is rarely common. The body length rages from 11 -19 mm. There can be quite a lot of variation in width of the yellow bands on the wing cases (elytra).

Adults are most commonly seen on flowers or old wood in July and August.

Larvae feed in old wood of deciduous trees, especially willow.

Starangalia quadrifaciata adult
 
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