DNA analysis and sequencing can provide a lot of useful information, and may be able to answer some questions that are not obvious by morphological criteria alone. Particularly, it may be able to demonstrate that two forms are quite similar genetically (and therefore presumably closely related) even though they are quite different morphologically - or, that two morphologically similar forms are actually not closely related. But as far as separation of species, subspecies, etc. is concerned, DNA studies don't provide automatic answers. In the final analysis, someone has to make a decision as to how much genetic variation is necessary to separate two species - just as someone has to decide how much morphologic variation is necessary to separate two species. Paul M. Rhode Island, USA