598 



Color and Pattern and their Uses 



parts that still remain dull yellow. It is apparent that in Anosia plexippus, 

 as in Callosamia promethea, the central areas of the wings are the first to 

 exhibit the mature colors, and that the ner\-ures and costal edges of the 

 wings are the last to be suffused." 



The development of the wing-patterns in the male and the female of the 

 promethea moth, as worked out by Mayer, is shown by Fig. 785. 



Other butterflies and moths which have been thus followed through 

 the pupal life show a similar possession of color-appearance. Tower has 

 similarly followed the color-development in certain beetles. Tower's figures 

 illustrating the development in the large blackish-brown Prionid beetle, 



Fig. 786. — Diagrammatic series showing development of color-pattern in pupa; and young 

 adults of the giant wood-boring beetle, Orthosoma hrunnea. The first three figures in 

 the upper line, counting from the left, are pup:c of successive ages, the rest of the 

 figures adults of successive ages, (.^fter Tower; natural size.) 



Orthosoma bninnea, are shown in Fig. 786. Tower finds that in all the 

 insects so far studied the chemical colors of the body follow the general course 

 illustrated by Orthosoma. The color begins to form on the head and anterior 

 parts first and gradually spreads posteriorly. 



