In allozyme generated trees, test populations of species of the North American Callophrys (sensu lato) (a group of hairstreak/elfin butterflies) clustered within the genera Mitoura, Callophrys, Incisalia, and Loranthomitoura. The pine-feeding species of Incisalia clustered weakly, but separately from non-pine feeding species of Incisalia (Deciduphagus). The trees present dissimilarities from recent taxonomic arrangements of Mitoura species and subspecies. Larval food plants (Calocedrus, Juniperus, and Cupressus), often used for distinguishing Mitoura taxa, do not necessarily follow the pattern of genetic relationships among populations. Mitoura thornei and M. muiri probably deserve no greater than subspecies status under M. loki and M. siva respectively. Mitoura gryneus and M. siva populations, considered conspecific by some workers, do not display a gradual geoclinal blend zone and are probably best considered separate taxa. A putative population of M. gryneus from Arkansas may deserve species status.
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