LAWSON: KANSAS CICADELLID^:. 153 



Deltocephalus flavicosta Stal. 



(PI. 12, figs. 3-4.) 



Jasstts (Deltocephalus) flavicosta Stal, Rio Jan. Hemip., ii, p. 53, 1862. 

 Deltocephalus flavicosta Van D., Can. Ent., xxiv, p. 116, 1892. 

 Deltocephalus retrorsus Uhl., Proc. Zool. Soc. Lond. for 1895, p. 78. 

 Deltocephalus harrisi (Fh. MS.) in collections. 



Deltocephalus flavocostatus O. & B., Proc_ la. Acad. Sci., iv, p. 217, 1897. 

 Deltocephalus flavicosta Bak., Psyche, viii, p. 117, 1897. 



Deltocephalus retroversus (Uhl. MS.) Smith, Cat. Ins. N. J., edn. 2, p. 95, 1900. 

 Deltocephalus flavocostatus DeL., Tenn. St. Bd. Ent., Bui. 17, p. 49, 1916. 

 Deltocephalus flavicosta Van D., Cat. Hemip. N. A., p. 645, 1917. 

 Deltocephalus flavicosta Lathr., S. C. Agr. Exp. Sta., Bui. 199, p. 64, 1919. 



Form: Length, 2.5 to 3.5 mm. Vertex distinctly wider than long, an- 

 terior margin nearly round, disc convex and sloping, without well-de- 

 veloped margin. Pronotum long, strongly convex anteriorly, lateral 

 margins very short, humeral margins long and rounding with slightly 

 emarginate posterior margin. Elytra long and narrow, exceeding the 

 abdomen. 



Color: Dark brown to black; vertex with four apical spots in form of 

 a square, three against each eye, and two at middle of posterior margin, 

 yellow. Pronotum with five yellow spots on anterior portion and five 

 faint longitudinal lines. Elytra very characteristic because of the yellow 

 two-thirds of costal area and two outer costal veinlets sometimes broadly 

 light. 



External genitalia: Female, last ventral segment twice as long as 

 preceding, narrowed posteriorly, posterior margin roundingly produced 

 and sometimes with a small median notch; pygofers sparsely spined, 

 broad and short, exceeded by the ovipositor. Male, last ventral segment 

 as long as preceding; valve broad, triangular, margins slightly concave 

 to obtuse or rounded apex; plates broad at base, longer than valve, mar- 

 gins with few spines, narrowing to acute apices which exceed the sparsely 

 spined short pygofers. 



Internal male genitalia: Styles acute at either end, apically toothed 

 on inner margin and sending long, parallel-sided processes from near 

 their middle length seemingly direct to the redagus, which is semicircular 

 when viewed laterally, and broad till near the apex, then greatly nar- 

 rowed, but ending obtusely. 



