. Bulletin. Natural history; Natural history. 286 Illinois Nati r\l History Sir\i^ Hilletix J'ol. 22, Art. 2 of sabiilosa (= depressa) still remains to he discovered, but when found will possess anal abdominal jiills. Claassenia arctica (Klapalek) Aiielunyia arctica Klapalek (1916, pp. 59, 78). Original description, S, 9- I'rria lantjuida Needham & Claassen (1925, p. 100). New synonymy. Claassenia larii/iiiJa Ricker (1938, p. 140). Notes on type and generic transfer. Acronniria deprissa (?) Claassen (1931, p. 86 and pi. 27, fig. 207). Misidentification of nymph. This larjje western species
. Bulletin. Natural history; Natural history. 286 Illinois Nati r\l History Sir\i^ Hilletix J'ol. 22, Art. 2 of sabiilosa (= depressa) still remains to he discovered, but when found will possess anal abdominal jiills. Claassenia arctica (Klapalek) Aiielunyia arctica Klapalek (1916, pp. 59, 78). Original description, S, 9- I'rria lantjuida Needham & Claassen (1925, p. 100). New synonymy. Claassenia larii/iiiJa Ricker (1938, p. 140). Notes on type and generic transfer. Acronniria deprissa (?) Claassen (1931, p. 86 and pi. 27, fig. 207). Misidentification of nymph. This larjje western species of stonefly has had an interesting bibliographic his- tor\. considering the few times it has been mentioned in literature. It was originally described by Klapalek in his new genus .!dcliinyia, with caudata from China as its genotype. In 1925, Needham & Claassen in their Monograph described languida from specimens from Wyoming and IVIon- tana, but strangely made no mention of a species arctica from "Arctic ; W'u (1934) noted that Adelungia was a preoccupied name and proposed Claassenia as the name to replace Adelungia, without any reference to its occurrence in North America. Ricker (1938) noted the close relationship between arctica and languida and placed both for the first time in the genus Claassenia. Kicker's figures of the typic specimens in the British Museum and studies of specimens in the Illinois Natural History Survey collection con- vinced me that languida is a synonj'm of arctica. Many species occurring in the mountains of northwestern states range far into Canada. Whether the species now included in Claassenia form a sufficiently distinct group to warrant generic status may be questioned, but at least for the present 1 am so recognizing them. In August, 1940, while in Yellowstone National Park. Wyo., I had an opportunity to rear series of arctica, both male and female, from nymphs and ob- serve some of the habits of the adults. 'I
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