1917] The Wing Venation of the Cercopidce 31 



differences. The costal and subcostal trachea are universally- 

 present in the fore wings of the Cercopidas, whereas they are of 

 very irregular occurrence in the Jassidas. In the Cercopidae 

 medius is usually unbranched and cubitus two branched, 

 whereas in the Jassidse medius as a general rule is two branched 

 with one branch very weak and cubitus is for the most part 

 unbranched. 



In the hind wing radius is mostly two branched in the 

 Cercopidae just as it is in the Jassidas. Medius, however, is 

 unbranched in Cercopidee but usually two branched in the 

 Jassidas. Cubitus is, on the other hand, usually two branched 

 in the Cercopidas but unbranched in the Jassidas. 



REFERENCES. 



Ball, E. D. 1896. A Study of the genus Clastoptera. Proc. Iowa Acad. Sc. 



111:182-194. 

 Ball, E. D. 1898. A Review of the Cercopidae of North America North of Mexico. 



Proc. Iowa Acad. Sc. VI:204-226. 

 Comstock, J. H. and Needham, J. G. 1898-1899. The Wings of Insects. Amer. 



Nat. Chapter 111:243-249. 

 Funkhouser, W. D. 1913. Homologies of the Wing Veins of the Membracidae. 



Ann. Ent. Soc. Am. VI:74-95. 

 Metcalf, Z. P. 1913a. The Wing Venation of the Jassidae. Ann. Ent. Soc. Am. 



VI:103-115. 

 Metcalf, Z. P. 1913b. The Wing Venation of the Fulgoridae. Ann. Ent. Soc. 



Am. VI:341-352. 

 Patch, Edith M. 1909. Homologies of the Wing Veins of the Aphididae, Psyllidae, 



Aleurodidae and Coccidas. Ann. Ent. Soc. ot Am. 11:101-129. 

 Van Duzee, E. P. 1916. Check List of the Hemiptera of America North of 



Mexico. New York. 



