Libelloides longicornis

Libelloides longicornis can reach a length of 25–30 mm (0.98–1.18 in) and a wingspan of 38–58 mm (1.5–2.3 in). The body of these large owlflies is black, quite hairy, with some yellow markings. Also the head is black, with large compound eyes. The long sturdy black antennae are clubbed. The wings do not have scales, are partly transparent and show a network of translucent lemon yellow ribs. In the fore wings appears a small basal dark spot reaching the base of the wings. The hind wings have a characteristic squared dark area towards the apex and a dark triangular sickle-shaped spot pointing to the wing tip. The wings are usually held spread in sunny areas, as in dragonflies, but when they are at rest they fold their roof-shaped wings over their abdomen. This species is rather similar to Libelloides coccajus, but in Libelloides longicornis the basal black area of the hind wings does not reach the anal angle.

This species is present in South Western Europe (France, Germany, Italy, Portugal, Spain and Switzerland). These insects mainly occur in the sunny meadows at rather high elevation.