Gilbert, Lawrence E.2011-08-022011-08-022004-05http://hdl.handle.net/2152/12782textelectronicengCopyright is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.Butterflies--EvolutionButterflies--HybridizationRestricted