Isoperla bilineata: Designation of a Neotype and Allotype, and Further Descriptions of Egg and Nymph1

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Abstract
A neotype and allotype are designated for Isoperla bilineata (Say), and further descriptions of egg and nymph are given. The aedeagus has 2 dorsal, 1 anterolateral and 2 posterolateral lobes, an eversible posterodorsal sac and a long coiled anterodorsal membranous tube. The triangular female subgenital plate is produced ca. ¾ the length of the 9th sternum. The vagina bears a “Y”-shaped spinule pattern and the seminal receptacle has 5–7 accessory receptacular glands, each lined with spinulae. The egg is oval, 0.39–0.42 mm width × 0.43–0.46 mm length, and the chorion is covered with large regularly placed depressions. The collar is well developed and micropyles are irregularly placed on a ridge below the polar ring. Nymphal laciniae have two apical teeth and mandibles bear 4 main teeth and 2 subteeth. The nymphal proventriculus has a band of 23–26 rows of short downward projecting spines.

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