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Abstract Investigations carried out in a coastal stream flowing to the Northern Bothnian Sea (Ängerån, 63°35'N, 19°50'E) have shown a high drift rate of mayfly nymphs towards the coastal areas. The nymphal development takes place in the estuaries with low salinity (conductivity between 47 and...
Abstract Several larval, pupal, and adult specimens of Aphropsyche monticola Flint were collected from a locality in Pennsylvania. Examination of this material led to the association of the immature forms of the genus Aphropsyche by the metamorphotype method. The larvae will key to Aphropsyche?...
Abstract An interesting and unusual instance of swarm‐feeding was observed when large numbers of the damselfly, Hetaerina americana fed on hatches of mayfly subimagos over riffle areas of the White River in Indiana. The phenomenon of swarm‐feeding in Odonata is reviewed and delineated and the...
Abstract Annual and seasonal variations of individual weights of dominant species of aquatic insects in Breitenbach, Germany, are described and the probable reasons of variations are discussed. Variations are not correlated in different species, and there appears to be no uniform explanation of...
Abstract Two new chironomid species, Rheotanytarsus illiesi sp. n. (from Breitenbach, Schlitz, Germany) and Brillia subviridis sp. n. (from Kematen near Inns bruck, Austria) are described.
Abstract The known African Ephemeridae presently consists of three genera and seven nominal species. Adults and larvae of Afromera evae sp. n. aredescribed from The Gambia. The genus Afromera is recognized as being distinct from Ephemera and is evidently equivalent to the subgenus Dicrephemera...
Abstract The larvae of Trinotoperla irrorata Tillyard (Gripopterygidae) possess remarkable chlorid cells consisting of one central cell and at least one adjacent cell grouped together into a small cell complex. They are termed floriform chloride cells because of the flower‐bud‐like structures...
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