TABLE OF CONTENTS 



PAGE 



Acknowledgments g 



PART ONE. THE HOMOLOGY OF THE SETAE. 



I. Introduction ii 



Historical 12 



The Chaetotaxy of a Typical Segment 14 



II. Nature of the Evidence 14 



Definitions 15 



Difficulties 15 



Comparative Anatomy 17 



Ontogeny 17 



Variation 20 



III. Application of the Evidence 20 



Application of Principles 21 



Choice of a Nomenclature 22 



IV. Setal arrangement in the Principal Superfamilies 23 



Suborder Jugatae - 24 



First Instar 24 



Later Instars 25 



Conclusions from a Study of Jugatae 29 



Suborder Frenatae 29 



V. Primary and Subprimary Setae 32 



Alpha, 32; Beta, 32; Gamma, 33; Delta, 33; Epsilon, 33; Rho, 34; 

 Theta, 34; Kappa, 35; Eta, 35; Pi, 36; Mu, 37; Sigma, 38; Tau, 38. 



VI. General Conclusions 38 



Synonyms 39 



PART TWO. SYSTEMATIC OUTLINE OF FAMILIES AND GENERA 



Introduction 41 



Characters Used 42 



Head Parts, 43; Armature of the body, 44; Spiracles, 45; Prolegs, 45; 

 Other Structures, 47. 



