112 Annals Entomological Society of America [Vol. VI, 



SUMMARY, 



The present paper homologizes the wing veins of Jassidce 

 with the wing veins of other orders. The wing veins of Jassidce 

 differ in the following important respects from those of other 

 insects. 



1. The costal trachea is practically eliminated from the 

 wings of Jassidce. 



2. The subcostal trachea is well developed in some genera 

 and absent in others, which indicates that it is disappearing 

 from Jassidce. 



3. The radial trachea is typically two branched in Jassidce, 

 the branches present being R2+3 and R4+5. 



4. The medial treachea is typically two branched, these 

 branches being M1+2 and M3+4. 



5. The cubital trachea is two branched in some cases and 

 unbranched in others. 



6. All three anal trachea are present, the first anal being very 

 closely connected with cubitus. Third anal is frequently 

 two branched. 



7. The ambient vein is a composite vein in Jassidce, being 

 formed along the overlapping tips of the principal trachea. 



ACKNOWLEDGMENTS. 



The writer wishes to express his appreciation to the following 

 persons who have assisted in the preparation of this paper: 

 Professor Herbert Osborn, Mr. R. L. Webster, Mr. Frankhn 

 Sherman, Jr., Mr. C. L. Metcalf and Mrs. Luella Correll 

 Metcalf. 



The writer also wishes to express his indebtedness to the 

 writings of Osborn and Ball on the Jassidce of North America, 

 without which the work of preparing this paper would have 

 been much more difficult. 



