30 Annals Entomological Society of America [Vol. X, 



In Monecphora (Fig. 1), however, it breaks up into a number of 

 fine branches toward the tip, and in Clastoptera (Fig. 9) it 

 appears to be unbranched. The three anals are always present 

 and the third is usually two branched. I believe that it is 

 always two branched and that in those genera in which two 

 branches do not show the results are due to the fact that it is 

 quite impossible to always get the anal angle of the wing pad 

 removed carefully. This is especially evident in our prepara- 

 tions of Philaenus but our preparations of Monecphora have 

 usually been good in this respect. Whether the trachea is 

 present in this latter genus or not cannot be decided now but 

 the forming vein is usually quite distinct in good preparations 

 (Fig. 1). 



THE HIND WING. 



The hind wing of the Cercopidae bears a striking resemblance 

 to the hind wing of the Jassidae. Although there are certain 

 constant differences that are worthy of being pointed out. 



Radius is typically two branched in all the genera of the 

 Subfamily Aphrophorinae. In the Monecphora, however, it 

 seems to be typically three branched (Figs. 2 and 4). The first 

 of these branches which I believe to represent radius one is very 

 variable in its relationships. In some cases (Fig. 2) it is attached 

 to radius two plus three and in other cases (Fig. 4) it is plainly 

 a branch of the main stem of radius. In either case it is very 

 weak and the only remnant of it in the adult wing (Fig. 12) is 

 a short spur attached to radius two plus three. 



Medius of the hind wing is unbranched in all of our genera 

 thus it differs decidedly from medius of the Jassid hind wing 

 which is typically two branched. As if to compensate for this 

 difference cubitus is two branched in all of our genera excepting 

 Clastoptera where it is unbranched, whereas in the Jassids 

 cubitus is typically unbranched. The three anals are typically 

 present. The third anal is two branched and the first anal is 

 usually very closely related to cubitus. 



SUMMARY. 



The present paper homologizes the wing veins of the Cer- 

 copidae with the veins of the other Homoptera. 



The venation of the Cercopidas is quite similar in general 

 facies to the venation of the Jassidae although there are constant 



