. Annual report of the Regents. New York State Museum; Science. AQUATIC INSECTS IN THE ADIRONDACKS 529 Then Hagen, in his Synopsis of the Neuroptera of North America (1861), ranked deplanata and exusta as synonymous (under the later name, however); in his Synopsis of the Odonata of America (1875) he ranked them separately, remarking that deplanata was probably but a dwarf southern form of exusta, but he wrote down j u 1 i a as a synonym of exusta. In 1893 Calvert in his Odonata of Philadelphia and vicinity again added deplanata to the exusta lump. The three have been treated as one ever since,
. Annual report of the Regents. New York State Museum; Science. AQUATIC INSECTS IN THE ADIRONDACKS 529 Then Hagen, in his Synopsis of the Neuroptera of North America (1861), ranked deplanata and exusta as synonymous (under the later name, however); in his Synopsis of the Odonata of America (1875) he ranked them separately, remarking that deplanata was probably but a dwarf southern form of exusta, but he wrote down j u 1 i a as a synonym of exusta. In 1893 Calvert in his Odonata of Philadelphia and vicinity again added deplanata to the exusta lump. The three have been treated as one ever since, and in all recent descriptions and lists, dimensions, coloration, structural characters and distribution are hopelessly confused; and it becomes necessary to revert to the original descriptions to find statement of differences between them. The two which concern us here in New York are L. e x u s t a Say and L. j u 1 i a Uhler. So far as I am able to judge by my own specimens and by those in the Museum of comparative zoology at Cambridge, these seem to be distinguished by the following characters. a Dorsum of the thorax pale with a black stripe each side on the humeral suture, no ante-humeral stripe of white ; the fuscous spot on the base of the hind wing not enveloping the triangle; the eighth abdominal segment of the male narrower than the seventh ; the apex of the anterior branch of the genital hamule of the male directed laterally julia aa Dorsum of the thorax blackish brown, with a white ante-humeral stripe each side; the fuscous spot of the hind wing envelops the triangle; the eighth abdominal segment in the male is as wide as or wider than the seventh; the apex of the anterior branch of the genital hamule of the male is directed posteriorly exusta I have described in the Canadian entomologist for 1897 (29:144-46) the nymphs of deplanata from Florida. These differ from the nymphs of L, j u 1 i a described below by some unusu- ally good specific characters, such as the en
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