Synanthedon vespiformis (Linnaeus, 1761)
52.0120 (B&F: 374)
Resident. In danger of extinction in both vice-counties. Larvae are sometimes common to very common in the few known colonies; adults may be just as numerous and are certainly not rare – but they are overlooked. Extremely local and distinctly episodic in high numbers due to the irregular availability of fresh-cut tree-stumps in deciduous woods. Single-brooded, flying mainly from late May to early August, occasionally from mid May. Larvae usually feed internally on the bark of oak, including the adjacent wood, but they are also occasionally found in birch and sweet chestnut. (Pratt, 2011).