ACKNOWLEDGMENTS

I thank M. Linares for many useful discussions and for the opportunity to see and work with the Colombia races of H. cydno early in the gestation of these ideas (1984-86). K. Brown has been a much appreciated long term source of general encouragement for my work with Heliconius. The work of and personal contacts with W. Benson, P. Sheppard, and J. Turner stimulated my initial interest in some of the problems discussed here. Thanks to J. Mallet, O. McMillian, and C. Jiggins for sharing unpublished manuscripts and for their comments on the manuscript. I thank the many colleagues in developmental biology who provided useful feedback, education, and encouragement especially S. B. Carroll, F. Nijhout, K. Kalthoff, S. M. Cohen, and S. Dyby. Reviewers R. ffrench-Constant and A. Monteiro made very useful suggestions and criticisms. I am especially grateful to D. Kapan, C. Penz, Phil Schappert, and Marcio Cardoso for extensive help in improving the manuscript and for useful discussions and to S. Bramblett and P. Schappert for help with computer graphics. I thank the dozens of hapless visitors to my lab, colleagues, students, and seminar audiences who listened patiently while I tried to explain these ideas. Questions and stimulating feedback from these folks helped me form the approach taken in this chapter. Research and collecting permits from the Costa Rican Park Service and Vida Silvestre and importation permits from USDA APHIS made these studies possible. Greenhouse facilities were developed under NSF grants DEB-79060332 and BSR-8315399 and with the support of UT Austin .