855 



itself. In Deiopeia for the rest the contrast between fore- and 

 liindwing, and especially between upper- and underside, is still 

 stronger than in Rhyparia, and the pattern of the under-surface 

 shows fargoing modifications and discontinuities. Should my views, 

 as explained in the foregoing, be right, then the upper side of e.g. 

 Cosclnia cribrwn bears the traces of the seven sei'ies of spots in 

 a more or less complete state, (especially in the variety rippertii), 

 Coscinia striata on the contrary being more modified in this part 

 of her colour-pattern, as in this form the rows of spots have 

 coalesced more or less in a longitudinal direction and thus changed 

 into coloured streaks filling the internervnral spaces. Yet traces of 

 two transverse rows of spots can still be clearly distinguished, 

 represented by a submarginal row of more or less independent, 

 dark, internervural streaks, and by the discoïdal spot. The latter 

 remains in existence, even when the remaining design completely 

 vanishes, as is also the case on the hindwings and the underside of 

 both wingpairs. 



In this way we are led without difticulty to the supposition, 

 that the colour-pattern of Arcliidae should be deduced from an 

 Underside Upperside 



Fig 4. Ocnogyna corsicum, var. sardoa. 



ancestral fundamental form, in which a light ground is dividedi nto 

 seven fields hy a corresponding numbei- of transverse rows of dark 

 spots. These -rows run uninterruptedly from fore- to hindmargin, 

 on both sides of the fore- as well as of the hindwings. 



The question however arises: is this ancestral form really the 



