LAWSON: KANSAS CICADELLHXE. 209 



Genus THAMNOTETTIX Zett. 



The members of this genus are slender bodied, with long 

 and narrow elytra, giving them a distinctly elongate appear- 

 ance. The vertex is always wider than long, sometimes about 

 parallel-margined, usually distinctly produced. The pronotum 

 is rounded anteriorly with rather short and sharp lateral 

 margins. 



Nine of the eleven species keyed below have been taken in 

 the state. 



KEY TO SPECIES. 



A. Vertex short, nearly parallel-margined, apex with two large black 

 spots. 

 B. Elytra without large yellow spot on clavus. 



C. Reddish-brown large species, usually 6 mm. or over. 



kennicotti. 

 CC. Lighter and smaller species, less than 6 mm. in length. 



brittoni. 



BB. Elytra with large yellow spot on clavus. clitellarius. 



AA. Vertex distinctly produced medially, without two large black apical 

 spots. 

 B. Margin of vertex without definite dark markings. 



C. Brownish species. longulus. 



CC. Greenish species. inornatus. 



BB. Margin of vertex with definite dark markings. 

 C. Disc of vertex marked with fulvous lines. 



perspicillatus. 



CC. Disc of vertex unmarked (spots behind ocelli in ciliatus). 

 D. Margin of vertex with four black spots. 

 E. Size larger, over 4.5 mm. in length. 



F. Vertex produced, about one-third wider 

 than long, no spots on disc. 



melanogaster. 



FF. Vertex shorter, nearly twice as broad 

 as long, two black spots behind ocelli. 



ciliatus. 



EE. Size smaller, less than 4.5 mm. in length. 

 F. Face not black. 



G. Color dull yellow; female segment 

 with distinct median tooth, male 

 plates with long attenuate tips. 



fitchii. 



GG. Brighter yellow in color; female 

 segment without distinct median 

 tooth, male plates not at all at- 

 tenuate, pallidula. 

 FF. Face black, due to coalescing arcs. 

 nigrifrons. 



14_Sci. Bui. 3058 



