1913] The Wing Venation of the Jassidce 109 



and resembles a cross vein. ' The usual position of R4+5 is 

 occupied by Mi+2. In Empoasca (Fig. 66) Rs coalesces with 

 Mi+2 for a short distance and then diverges toward the costal 

 border M3+4 being very distinct. 



CUBITUS AND FIRST ANAL OF THE FORE WING. 



In all of the genera of Jassidce examined the cubital and first 

 anal tracheae were the most constant and formed one of the best 

 landmarks in the study of the relations of the tracheae. They 

 are coalesced for some little distance from the base of the wing. 



Cubitus is frequently two branched (Figs. 8, 22, 23, 25, 43, 

 48, 60). Here again we can trace almost a complete series from 

 a form like Jassus (Fig. 60) or Goniognathus (Fig. 25), where 

 Cu2 is equally as important as Cui, through intermediate forms 

 like Gypona (Fig. 8), to forms like Phlepsius (Fig. 48) where Cu2 

 is reduced to a mere spur. 



In the TyphlocybidcB (Fig. 64 and 66) M34-4 has come to 

 occupy the region usually occupied by Cui and cubitus is 

 unbranched and diverges strongly toward the anal border 

 which gives it the appearance of having lost branch Cui and 

 having retained Cu2. 



The first anal vein lies along the anal border of the claval 

 suture. It has not been usually recognized as a distinct vein 

 owing to the fact that as a vein it is rather inconspicuous while 

 the claval suture or fold is very distinct. It is, however, pre- 

 ceded by a conspicuous trachea in all of the genera studied. 



SECOND AND THIRD ANALS OF THE FORE WING. 



The second and third anal tracheae in the fore wing are well 

 developed and the third anal is frequently two branched 

 (Figs.. 3, 5, 6, 20, 23, 25, 41, 46, 60). 



THE HIND WING. 



In all of the Jassidce proper the hind wing is very uniform. 

 No costal or subcostal tracheae have been discovered although 

 the subcostal vein was well defined in all of the older nymphs 

 studied (Figs. 9, 24, 45, 47). 



