Owl Sulfur male resting on a blade of grass in a wet meadow. Although this species lives mainly dry environments, tiny colonies are found in wetlands well exposed. Limousin, France.
The Owly Sulphur as its name suggests is usually yellow. Few individuals, as this male, can be white, which somewhat complicates their identification, because then they can be confused with a closely related species, a white Owlfly (Libelloides lacteus). Vercors, France.
Blue crown and dark blue line passing through the eye, and encircling the white cheeks to the chin. White forehead. Wings and tail are blue. Underparts yellow.