INTRODUCTION. X.wii 



IV. Prc-mcdia. [Absent in LepidopUia ] 

 V. Media. [Discoidal ncrvulcs and ui)[)cr median ncr 



vule.] 

 V^I. Post-media. [Absent in Lepidopfcra.'] 

 VII. Cubitus. [Middle and luwer discorcllular nervulcs.] 

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



This system is liable to the additional disadvantage of Nos. 

 IV. and VI. being absent in Lepidopfcra. 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. 



