THE THORACIC AND CERVICAL SCLERITES OF INSECTS. 



By J. F. Martin.* 



CONTENTS. 



PAGE 



I . Introduction o c 



II. Historical Review vj 



III. Discussion of Thoracic Sclerites 4g 



1. Tergum ....'.'.'.'. 48 



2- Wings 50 



3. Pleuron 5j 



4. Epimeron 55 



5. Episternum . . . 58 



Precoxale. 



7. Trochantin. 



8. Coxa 



9. Sternum.. . . 



62 



65 



67 



69 



10. Intersegmentalia ' 73 



11. Cervical Sclerites 74 



IV. Summary 70 



V. Bibliography yg 



VI. Terminology g2 



VII. Explanation of Plates co 



INTRODUCTION. 



This paper is presented as the morphological part of a thesis 

 for the degree of Doctor of Philosophy at the Massachusetts 

 Agricultural College. It has been prepared under the super- 

 vision of Dr. H. T. Fernald and Dr. G. C. Crampton, to both of 

 whom^ I wish to express my sincere thanks for the many ways 

 in which they have guided and helped me in the work. I am 

 also indebted to Dr. G. C. Crampton who has kindly furnished 

 all the material upon which this paper is based and by which 

 it was made possible. 



Some of the Hterature used and referred to was obtained 

 from the Hbrary of the Massachusetts Agricultural College. 

 Other volumes were obtained from the Boston Society of Natural 

 History, through Dr. H. T. Fernald. Most of the books, how- 

 ever, were loaned from the private libraries of Dr. C. H. Fernald, 

 Dr. H. T. Fernald, and Dr. G. C. Crampton, to each of whom 

 I am greatly indebted for their use. 



♦Contribution from the Entomological Laboratory of the Massachusetts 

 Agricultural College. 



35 



