LAWSON: KANSAS CICADELLID^. 249 



A. General color above — concluded. 



DD. Species smoky or, if yellowish, with oblique lines 

 fused. 



E. Species yellowish with broad dorsal stripe 

 running the length of the insect. 



dorfialis. 



EE. Species smoky, without dorsal stripe. 



fumida. 

 AA. General color dark above. 



B. Reddish brown species. vulnerata. 



BB. Species black above, marked with white. nigra, 



Erythroneura tricincta Fh. 



(PI. 16, figs. 15-16.) 

 Erythroneura tricincta Fh., Homop. N. Y. St. Cab., p. 63, 1851. 

 Typhlocyba tricincta Woodw., Psyche, v, p. 213, 1889. 

 Typhlocyba tricincta G. & B., Hemip. Colo., p. 113, 1895. 

 Typhlocyba tricincta Gill., Proc. U. S. Natl. Mus., xx, p. 753, 1898. 

 Typhlocyba tricincta Osb., 20th Rept. N. Y. St. Ent., p. 544, 1905. 

 Typhlocyba tricincta DeL., Tenn. St. Bd. Ent., Bui. 17, p. 104, 1916. 

 Erythroneura tricincta Van D., Cat. Hemip. N. A., p. 712, 1917. 

 Erythroneura tricincta Pent., Ohio Jl. Sci., xviii, p. 186, 1918. 

 Erythroneura trici-)tcta Lathr., S. C. Agr. Exp. Sta., Bui. 199, p. 113, 1919. 



Form: Length, about 3 mm. Vertex strongly produced, nearly twice 

 as long on middle as next the eye, one-half wider than long. Pronotum 

 about twice as wide as long, anterior margin broadly convex, lateral 

 margins moderately long, slightly widening posteriorly, humeral margins 

 rounding into slightly concave posterior margin. Elytra moderately long, 

 widest at middle, giving insect oval outline. 



Color: Vertex, pronotum, and scutellum pale yellow, elytra whiter. 

 All but median anterior portion of pronotum, and usually base of scu- 

 tellum, with a red to black transverse band. Elytra with a broad red 

 band near middle, becoming black costally, and with a brown band api- 

 cally, and with transverse veins, red, and sometimes with red streaks 

 running backward from the middle band. 



External genitalia: Female, last ventral segment long, posterior mar- 

 gin strongly medially produced; pygofers fairly robust, spiny along 

 mesal margin, exceeded by the ovipositor. Male, last ventral segment 

 concave posteriorly; valve large, longer than last ventral segment and 

 wide, closely appressed to plates; plates broad basally, then suddenly 

 narrowing and tapering to acute upturned and black-tipped apices, mar- 

 gins with three or four spines on basal third; pygofers fairly long, but 

 completely hidden by plates. 



Internal male genitalia : Styles long, anterior portion slender and 

 with straight margins, lateral margins broadly rounded after attachment 

 to connective, the style then narrowing till just before a sharp tooth on 

 the inner margin, after which it is of about the same width as before the 

 tooth to the broad two-cornered apex, between which it is slightly con- 

 cave distally; connective rather slender, cup-shaped; oedagus with a club- 

 shaped dorsal process near the base which has an anterior process at 

 about its middle, the main portion broad basally, then rapidly narrowed 



