997 



Returning to the upper side of the fore-wing-, it is at once clear 

 that the same pattern occurs on it as on the corresponding wing of 

 populi. It is onlj somewhat more differentiated: the dark middle 

 area is broken up into a foie- and a liind-part by a narrow funnel- 

 like slit of light colour, along the course of the second cubital vein, 

 while the middle-member of the dark Ribbon U has inci-eased in 

 bulk and shade to a very dark square. 



In the same way the anterior and posterior triangular sjjot, 

 especially the latter, are much more conspicuous and independent 

 than in populi. 



By proceeding this way we can gradually arrive at the probable 

 conclusion that the patterns on upper and under side of both fore- and 

 hind-wing of ocellata repose on one and the same groundplan, and 

 that this primitive pattern has suffered the strortgest modification on 

 the nppei' side of the hind- wing, in consequence of its partial 

 overshadowing by a red discoloration and of the differentiation of 

 the back part of the pattern to an eye-spot. 



Should further proof be needed, that the pattern of ocellata takes 

 its issue from the same groundplan as that of populi, this proof, as 

 already remarked, would be furnished by intermediate forms as 

 coecus and kindermanni. 



As far as the markings on the upper side of the fore-wing, Sin. 

 coecus corresponds more to populi than to ocellata, the transverse 

 bars being more complete and more purelj' traced than in the latter. 

 Especiallj^ the dark middle area is not split up into a fore- and a 

 back-part, the Bars III, IV and V therefore all running straight 

 and unbroken from before backward, V in particular being sharp 

 and dark. 



On the hind-wing the eye-spot is less purely circular, because the 

 external (hinder) dark line and the black pupilla-lijie are less rounded 

 and more advanced toward the hind-margin, thei'eby giving the 

 impression of fragments of ribbons. 



On the other hand the vestiges of original design along the 

 front-margin, hidden under the hind-rim of the fore-wing, are less 

 conspicuous than in ocellata. 



On the fore-wing of kiiidennaimi (Fig. 3) the median area is 

 broken up as in ocellata, and in general the similarity with the last 

 named species is greater, the design ajipearing only somewhat 

 sharper, especially Bar VII looking thereby uiore conspicuous. The 

 convex blotch along the outer margin is divided into a smaller 

 anterior and a bigger posterior part. The pink hue on the hind-wing 

 is particularlj- vivid in tone, but the eye-spot is perfectly flat and 



