No. 382.] THE WINGS OF INSECTS. 773 
examination of the set of accessory veins borne by vein Cı 
shows that the distal members of the series are well developed, 
and that the growth of additional veins is taking place in the 
disk of the wing at the proximal end of the series. In this case 
the first accessory vein is the distal one. : 
Accessory veins interpolated. — In the wing of the cockroach 
Fic. 56. — Hind wing of a nymph of a cockroach. 
represented by Fig. 56 there are many accessory veins borne 
on the cephalic side of ‘radius. From the presence of the fine 
twigs near the apex of the wing, it is evident that accessory 
veins are being added distally. It is also evident that the num- 
ber of veins is being increased by the splitting of certain of 
the older veins, ż.e., by interpolation. In cases of this kind it 
is impracticable to number the members of a series of accessory 
veins. 
