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Published online by Cambridge University Press: 31 May 2012
During a study of the species of Tubifera known to occur in Maine the author noted that certain specific key characters were not always constant, and often a long series of several species was required before identification was certain. In search of taxonomic characters to supplement those given in literature the author extracted and compared the male hypopygia of several known species of Tubifera. It soon became apparent that this structure deserved more emphasis in the taxonomy of this interesting genus.