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The genus Capnia in North America is reviewed and compared to other genera in the family. The genus is divided into 10 species groups. A key to the 51 species of Capnia in North America is given along with a listing of type localities, type repositories, diagnoses, and distributions. New illustrations of structures hearing characters important for identification and classification are presented. An annotation of the list of Capnia of North America given by Stark, Szczytko, and Baumann (1986) reflecting current generic placement of species is produced. From this list Capnia bakcri and sugluka are moved to Mesocapnia. Capnia barbata Frison is placed in synonymy under Capnia decepta. The movement of cygna (synonym oi venosa ), elevata, fibula, manitoba, oenosa, and wanica to Capnura (Nelson and Baumann, 1987b) is noted. Capnia disala and ensicala are placed in Paracapnia.

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Since the early 1900s, efforts have been made to catalogue the stoneflies of Mongolia. Taxonomic work from 1960 to1980 greatly expanded basic lists of stoneflies in Mongolia, but no comprehensive survey or synthesis of this dispersedliterature has been completed. In conjunction with a modern survey of the aquatic insects of Mongolia, we collectedPlecoptera on a series of expeditions to the Selenge (north) and Altai (west) regions of Mongolia. A total of 48 speciesdistributed in 24 genera and 8 families were documented, including 3 of the 5 Mongolian endemics, 2 new species re-cords for Mongolia, and 1 species new to science. The majority of the fauna is representative of the East Palearcticregion. The 800+ specimen records were used to validate historical species lists, document species ranges with georef-erenced localities, and create identification tools to be used by Mongolian and international researchers with a broadrange of taxonomic expertise. These identification tools include a generic-level key to nymphs, species diagnoses, aswell as known species range and predicted species range maps created using Ecological Niche Modeling. These toolsare primarily intended for use by Mongolian scientists, sampling teams, and community water quality monitoringgroups, as well as general use by researchers interested in biogeography, ecology, and water quality applications ofMongolian Plecoptera. With this work, we hope to equip Mongolians with the scientific resources to protect their valuable and vulnerable water resources.