28 Annals Entomological Society of America [Vol. X, 



MATERIAL. 



In all, five of the six North American genera have been 

 studied. The only genus of which I could not secure nymphal 

 material is Philaronia Ball which, however, is quite close 

 to certain other genera and its venational characters seem quite 

 evident on comparing it with closely related genera. In the 

 course of these investigations which have covered odd moments 

 for the past eight years I have had abundant material of the 

 following genera: Monecphora A. & S. (Tomaspis Stal), 

 Lepyronia A. & S., Clastoptera Germ. In the genus Aphrophora 

 Germ, I have had a fair amount of material but in the genus 

 Philaenus Stal, my material has been rather limited owing to 

 the fact that the genus does not occur in eastern North Carolina 

 at all and only to a very limited extent in the mountains. So 

 that for material in this genus I have had to depend on material 

 kindly sent me from Maine by Professor C. L. Metcalf. 



THE FORE WING. 



The fore wing of the Cercopidas, at least of our North 

 American genera, is rather thick and opaque, and the venation 

 as a rule is not very distinct or if it is plainly visible it is broken 

 up in fine reticulations so that the main venation is badly 

 obscured. However, an examination of the nymphal wing pads 

 shows a condition found among certain genera of the Cicadel- 

 lidae (Jassidse) to which family the Cercopidae are otherwise 

 closely related. 



In reviewing the trachea of the fore wing we find that costa 

 is typically present in all genera studied lying as a single 

 unbranched trachea parallel to the costal border. In the adult 

 wing this makes the vein that thickens the costal border of 

 the wing. 



A subcostal trachea has been found in all the genera of the 

 subfamily Aphrophorinae. It has not been found in the single 

 genus of the subfamily Cercopinae that has been available for 

 study, hence it may be presumed that it is absent in this sub- 

 family. In the adult wings of the genera closely related to 

 Aphrophora the subcostal vein is closely united with radius 

 both basally and distally but throughout the center of its course 

 it is rather widely separated from radius so that it cuts off an 



