CONTENTS. 



The Genus Dendroctonus A. D. Hopkins.. 1 



Introductory 1 



Historical 3 



Original description of genus 4 



Translation 4 



Synonymy 5 



Re visional notes 5 



Revised description of genus 5 



Anatomical 5 



Nomenclature 7 



Illustrations 9 



External characters of the imago 9 



The head 11 



The thorax 22 



Divisions of the thoracic segment 23 



Elements of the adult thorax 26 



The prothorax 26 



The mesothorax 28 



Mesotergum 28 



Mesopleura 29 



Mesosterna 30 



The metathorax 30 



Metatergum 30 



Metapleura 34 



Metasterna 35 



The"abdomen 35 



Abdominal tergites 36 



Abdominal pleurites 38 



Abdominal stemites 38 



Spiracles 39 



The legs 39 



The wings 40 



Mesothoracic and metathoracic wings 42 



Metathoracic or hind wings 43 



Mesothoracic wings or elytra 49 



Internal anatomy 51 



Digestive system 52 



Secondary sexual characters 52 



Pupa 53 



Larva 57 



External characters 57 



Digestive system 64 



Eggs 64 



Physiological characteristics 64 



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