Many workers have contributed to this study. We particularly thank the curators
of the various collections, who kindly allowed us to examine specimen under
their ownership or care. Jim Redner generously contributed his taxonomic expertise
to the problems of synonymy. Dr Yuri Marusik, Magadan, U.S.S.R., brought to
our attention a number of North American (and Manitoban) species that he has
discovered in Siberia or the Soviet Far East in recent years. Lastly, we thank
Drs W. O. Pruitt, Jr., R. E. Roughley, R. Wrigley, S. Koponen, and J. R. Duncan
for their constructive comments on the manuscript.
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