298 



THE WINGS OF COLEOPTERA 



is especially striking is that similar modifications occur in the two pairs of 

 organs. We figured the tracheation of the wings of two cerambycid pupse ; 

 these figures are repeated here (Fig. 308 and 309). 



"In the species represented by Figure 308, the radial trachea is the 

 most prominent one in both elytra and hind wings. On the other hand, in 



Fig. 308.- — Tracheation of the wings of a cerambycid pupa (From C. & N.). 



the species represented by Figure 309, the radial trachea is reduced in both 

 elytra and hind wings to a mere vestige. If the elytra and hind wings were 

 not homodynamous organs, it is not probable that the modifications of the 

 two would be so closely correlated. 



"In comparing the tracheation of the elytra with that of the hind wings, 

 the most striking difference obsen^ed is the greater reduction of the anal 



■^^ 



Fig. 309. — Tracheation of the wings of a cerambycid pupa (From C. & N.). 



