LÉPIDOPTÉROLOGIE COMPAREE 93 



form of eyes) on the upper side, their altered position on the 

 underside, and a lot more beside5(!) affords quite a suffîcient 

 différence. It is unnecessary to bore myself any longer with it. 



" Both sexes are very little differentiated by the ground colour. 

 The illustration lying before us shows a female. The maie has, 

 though only occasionally, a ground colour somewhat deeper (hohe) 

 toward the brownish ochre-yellow. It shows a single one of the 

 blirid eyes on the upper side of the hind wing, while in the female, 

 there are three or more often four. The under-side is coloured 

 somewhat darker. It tends more to brownish. 



" On this dark the broken white band shows up so much the 

 more distinctly. A row of six eyes stands at the same distance 

 from the border. They do not differ materially in size. The 

 middle ones are the smallest, and the last one next the body is 

 double. The différence between the sexes is put beyond doubt 

 by the physical characteristic (gliedmassen) observations which 

 hâve been confirmed, also, by an expert observer Herr Strasskircher, 

 chemist, of Neustadt-on-the-Aisch after his own investigations. 

 I hâve had the advantage of sharing his most accurate drawings 

 as a valuable contribution. " 



Finally, I think that the characteristics upon which Dr. Buckell 

 bases his three divisions of the species in Britain and Ireland 

 should be quoted to compare with the descriptions of the original 

 authors. 



" It may be helpful at this point ", he says, " to indicate certain 

 characters which are not sufficiently constant to be available in 

 the differentiation of the several fcrms. The colour of the upper- 

 surface is of some value in differentiating the Southern from the 

 other two forms, but of none as between the Middle and Northern 

 Forms; the female is always lighter than the maie • — ■ in the Middle 

 and Northern forms much lighter. The contmuity or interrupt- 

 edness of the white band across the middle of the under surface 

 of the hind wings is of no value whatever; its condition varies 

 in&nitely and correspondingly in ail the forms. The best distin- 



