CONTENTS 



Page. 



Introductory 1 



Historical references 2 



Copy of original description of the genus 3 



Translation of original description 3 



List of species of Pissodes described previous to 1909, with recorded distri- 

 bution and host trees 6 



Taxonomy 8 



Characters used by different authors 8 



Subordinal and family characters 8 



Tribal and subfamily characters 8 



Revisional notes 9 



Generic characters 9 



Subordinal and family characters 9 



Abdominal segments 9 



Revised classification 10 



Subordinal to subfamily characters 11 



Generic characters 11 



Anatomical details of the adult 12 



The head 12 



The thorax 1" 



The prothorax 18 



The mesothorax 18 



The metathorax 20 



The abdomen 20 



The wings 21 



Internal anatomy 22 



Secondary sexual characters 22 



The eggs 23 



The larva 23 



The pupa 25 



Host trees , 26 



General habits 26 



General life history 27 



General distribution 27 



The North American species of Pissodes 27 



Natural classification of the species 27 



Statistical taxonomy 28 



Morphological and physiological characters and characteristics 30 



Key to the species 30 



Synopsis of adult characters, with descriptions of new species 32 



Synopsis of primary sexual characters 37 



Synopsis of secondary sexual characters 37 



Synopsis of pupal characters 38 



VII 



