INTRODUCTION. Xxvii 



IV. Pre-media. [Absent in Lepidoptcra ] 

 V. Media. [Discoidal nervules and upper median ner 



vule.] 



VI. Post-media. [Absent in Lepidoptera^ 

 VII. Cubitus. [Middle and lower discocellular nervules.] 

 VIII.-X. Anal. [Sub-median and internal nervures.] 



This system is liable to the additional disadvantage of Nos. 

 IV. and VI. being absent in Lepidoptera. It is, of course, highly 

 desirable to have an uniform system of nomenclature for the 

 Orders of Insects ; and the want of precision at present exist- 

 ing in the nomenclature of the nervures, &c., is a matter of con- 

 siderable inconvenience ; but it will, perhaps, be necessary to 

 wait till the subject has been more thoroughly worked out in 

 detail in the separate Orders, before it will be possible to 

 elaborate a completely satisfactory system. 



