THE WINGS. 



29 



boundaries of the wings ; and, unless the reader 

 makes himself acquainted with them, he wiU find 

 himself quite at a loss when reading the descrip- 

 tions of insects in jDurely scientific books. 



The accompanying diagram represents the 

 various parts of the upper and anterior wing of 

 the INIoth, 



D 



Beginning with the part designated by the 

 capital letters, a is the anterior margin, B the 

 costal nervure, c the median nervure, d the 

 anal or posterior angle, e tho posterior or interior 



