ONTOGE:nY of ADUI.T COI.OR PATTERNS. 



i6i 



is highly significant that these ontogenetic color changes, that is, the order, 

 direction, and frequency of union of color centers, is the same as that of spots 

 in individual variation. Thus we have in ontogeny the basis for understand- 

 ing and interpreting the facts of variation. 



costal 

 subcostal N ^ 



discal cell-N.^ 



costal horden 



transverse vein 



cubitus- '^ -' " 

 anal' ' 

 transverse vein- ^ 

 costar""--. 

 subcostal' "^ - 



^ A ■ 



anaL horder. 



costal border, 



discal cell 



transverse vein-^-^^ 

 costal ~-,^ 

 subcostal- -_ 



discal cell 



Text-figure id.— Diagrammatic figures of an elytron (A), a coleopterous hind 

 wing (B), and a butterfly fore wing (C), to show hotnology of parts and the 

 obliteration of the margin in elytra. 



The wings, which are flattened, bag-Hke evaginations of the body wall, 

 variously modified and ornamented, carry the most complicated, and, for cer- 

 tain lines of inquiry, the most significant parts of the color pattern of the 

 entire insect. The coloration of the wings has justly received the lion's share 

 of attention from those studying insect coloration. This is especially true of 

 the Lepidoptera. 



