GENERAL ACCOUNT OF BUTTERFLIES 



Having named the wing-veins, the simplest 

 possible method of designating the cells of the 

 wing is to apply to each the abbreviation of the 

 name of the vein that forms its front margin. 

 In Figure 9 the veins are designated by letters at 

 the margin of the figure ; the cells by letters 

 within the figure or at the ends of the dotted 

 lines. 



Near the center of the basal half of the wing 

 there is a large cell 

 which is bounded in 

 front by the main «, 

 stem of radius and 

 which for this reason 

 might be called cell 

 R. But this cell is 

 really composed of 



tWO Cells, Which have FlG - 9— Fore wing of a butterfly with 



the veins and cells named. 



been thrown together 



by the fading out of the main stem of media. 

 For this reason this cell is designated as cell 

 R -f- M. This is the discal cell of most writers 

 on the Lepidoptera. 



The details of the venation of the wings can 

 be seen best, in Lepidoptera, on the lower sur- 

 face of the wings ; as on this surface the veins 

 are not so obscured by scales as on the upper 



15 



