Libellula quadrimaculata, known in Europe as the four-spotted chaser and in North America as the four-spotted skimmer, is a dragonfly of the family Libellulidae found widely throughout Europe, Asia, and North America. The adult stage is found between April to early September in the United Kingdom, and from mid-May to mid-August in Ireland. Larvae have a two-year developmental cycle. Adults feed predominantly on mosquitoes, gnats, and midges; the larvae feed primarily on other aquatic insect larvae and on tadpoles. The four-spotted skimmer is the state insect of Alaska.