Taxonomic studies and new taxa of North American butterflies
New diversity is reported and discussed among North American butterflies. Several dozen new taxa are named. A new "sibling" species has been found to occur throughout the Rocky Mts., introducing a new butterfly species to most states in western U.S. and to southern Alberta and BC. Several taxa of Colias, Euphydryas, Lycaena, and Plebejus are raised to species status. Many name changes are made, and many taxa are switched between species to create several dozen new combinations. The relevance of species concepts to difficult groups of butterflies is explored.