LAWSON: KANSAS CICADELLID^. 



235 



Distribution: Most abundant in the eastern counties of the 

 state, as shown by the following map : 



Hosts: Probably a grass feeder. 



Tribe TYPHLOCYBINI (Kirschb.). 



The members of this tribe are rather uniformly small species, 

 elongate and fragile. They differ from the other tribes of the 

 Jassinas and from other Cicadellidas in two particulars chiefly, 

 namely, that the four sectors of the elytra run to the cross 

 nervures without branching so that there are no anteapical 

 cells, and in the fact that the ocelli are often wanting. 



The tribe is divided into a number of genera, six of which 

 are represented in our fauna. The genus Eupteryx, though not 

 represented in the state, is included in the key. 



The following key to the genera is adapted from Gillette, 

 Proc. U. S. Natl. Mus., xx, p. 710, 1898. I have followed the 

 nomenclature given by McAtee, Proc. Biol. Soc. Wash., xxxi, p. 

 109, 1918. 



KEY TO GENERA. 



A. Sectors of posterior wings ending in a marginal vein. 



B. Elytra with an appendix. Alebra 



BB. Elytra without an appendix. 



C. Two apical cells in posterior wing. Dikraneura. 

 CC. One apical cell in posterior wing. Empoasca. 



AA. Sectors of posterior wings ending in wing margin, no marginal vein. 



B. All four sectors extending to the wing margin. Eupteryx. 

 BB. Sectors one and two uniting so that only three veins extend to 

 the wing margin. 



C. First and third apical cells of elytra contiguous at base, 

 second apical cell triangular. Typhlocyba. 



