The tobacco-coloured longhorn beetle (Alosterna tabacicolor) is a small beetle with huge antennae that are twice the length of the body so it is fully deserving the title of a longhorn (the antennae are not horns of course). The beetle itself has a black thorax and head but the wing cases (the elytra) are, you guessed, tobacco coloured hence the other part of its common name.
This beetle is found in woodlands where the larvae feed on damp, rotten wood, especially soft woods like conifers and so can be found in the Corsican pine plantations in Dorset. The adult beetles visit flowers for food and the best place to find them is on the heads of flowers that occur along the rides and pathways in woodlands. They are wide spread and not uncommon in southern England from April through until late August.