Celastrina neglecta, the summer azure, is a butterfly of the Lycaenidae family. It is found in North America. Layberry, Hall, and Lafontaine, in The Butterflies of Canada, describe the species: The upper surface is pale blue with an extensive dusting of white scales, especially on the hindwing. In some females the blue is almost entirely replaced by white with a small amount of blue near the wing bases. Females have a broad blackish-grey band on the outer third and costa of the forewing. The underside is chalky white to pale grey with tiny dark grey spots and a zigzagged submarginal line on the hindwing.