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The distribution patterns of seven different arthropod taxa representing eleven individual monophyletic lineages with representatives in eastern North America, Europe, and northeastern Asia were analyzed. Taxon cladograms representing relationships among taxa were converted to area cladograms representing relationships among areas. Nine of the area cladograms were found to represent one congruent repetitive distribution pattern. The two remaining cladograms represented two additional independent distribution patterns. The distribution patterns were correlated with geological events that have alternately divided and reunited the principal land areas during the past 180 million years. Asia. known •s. What ^ EmomollTSen/^^^^^ °'^'^^ ^''"'^'°'"' ^^'^^"^^s Agricultural Experimem Station. ' I S^o^IS^ the fnl ' ^"'"^.^^".y of Arkansas, Fayetteville, Arkansas 72701. .,,bk suggesT ons Ronda mueriv 7'"' '"p.n« 6-628 1983]

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No abstract

Species in the class Diplura are recorded from Alaska for the first time. Two species, Tricampa rileyi Silvestri from Dall and Prince of Wales Islands in the Alexander Archipelago of Southeast Alaska and Metriocampa allocerca Conde & Geeraert from near Quartz Lake, southeast of Fairbanks, both in the family Campodeidae, are documented based on recently collected specimens deposited in the University of Alaska Museum Insect Collection. A brief review of the history of the documentation of the Alaskan soil microarthropod fauna is provided, as well as discussion of possible glacial refugia.