LAWSON: KANSAS CICADELLID^. 157 



Deltocephalus inimicus (Say). 



(PI. 12, figs. 1-2.) 

 Jassus inimicus Say, Jl. Acad. Nat. Sci. Phila., vi, p. 305, 1831 ; Compl. Writ., ii, 

 p. 382. 



Amhlycephalua inimicus Eh., Homop. N. T. St. Cab., p. 61, 1851. 



Tettigonia inimica Walk., List Homop., iv, p. 1158, 1852. 



Jassus 6-punctatvs Prov., Nat. Can., iv, p. 378, 1872. 



Jasstts inimicus Forbes, 14th Kept. 111. St. Ent., pp. 22, 67, 1884. 



Deltocephalus inimicus Van D., Can. Ent., xxi, p. 11, 1889. 



Deltocephalus inimicus Osb., la. St. Agr. Soc, Kept, for 1892, p. 687. 



Deltocephalus inimicus Osb., Insect Life, v, p. 113, 1892. 



Deltocephalus inimicus Osb., U. S. Dept. Agr., Div. Ent., Bui. 30, p. 45, 1893. 



Deltocephalus inimicus O. & B., Proc. la. Acad. Sci., iv, p. 215, pi. 24, fig. 3, 1897. 



Deltocephalus inimicus Osb., 20th Kept. N. Y. St. Ent., p. 523, 1905. 



Deltocephalus inimicus Osb., U. S. Dept. Agr., Div. Ent., Bui. 108, p. 72, fig. 11, 1912. 



Deltocephahis inimicus Osb., Me. Agr. Exp. Sta-., Bui. 238, p. 123, 1915. 



Deltocephalus inimicus DeL., Tenn. St. Bd. Ent., Bui. 17, p. 51, 1916. 



Deltocephalus i«f>/it<"ws Van D., Cat. Hemip. N. A., p. 644, 1917. 



Deltocephalus inimicus Fent., Ohio Jl. Sci., xviii. No. 6, p. 184, 1918. 



Form: A large, fairly robust species. Length, 2.75 to 5 mm. Vertex 

 distinctly wider than long, disc slightly concave and rounding with front, 

 very obtusely or roundingly angulate apically. Pronotum long, not 

 twice as broad as long, lateral margins very short. Elytra long and 

 rather narrow, exceeding the abdomen, clavus reticulate, middle ante- 

 apical cell constricted and divided. 



Color: Grayish or light fuscous marked with brown. Vertex whitish 

 or yellowish in light forms, fuscous in dark ones, with two small apical 

 spots, a pair of large round black ones before the eyes and between and 

 behind these a pair of smaller fuscous spots. Pronotum with two large 

 black spots on anterior margin, sometimes others near anterior border, 

 and with five faint, longitudinal, light lines. Scutellum with black basal 

 angles. EIji;ra with the nervures broadly light, bordered with fuscous, 

 especially in the apical region. Face fuscous with light median line and 

 arcs. The color of this species varies very greatly from almost unmarked 

 forms to very dark ones. The three pairs of spots, however, on vertex, 

 pronotum and scutellum, are quite constant and thus readily distinguish 

 the species. 



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

 preceding, composed of two membranes, the inner broadly excavated 

 posteriorly, only the rounded, lateral angles showing from under the 

 outer membrane, which is suddenly narrowed posteriorly and terminates 

 in a three-lobed posterior margin, which is about half the width of the 

 broad anterior margin; spiny pygofers long and narrow, equalling or 

 only slightly exceeded by ovipositor. Male, last ventral segment as 

 long as preceding, posterior margin roundingly emarginate; valve short, 

 triangular, apex obtuse, margins slightly concave; plates nearly as broad 

 as valve at base, spiny margins concavely narrowed to attenuate and 

 acute apices; pygofers broad, apically obtuse, sparsely spined, slightly 

 exceeding plates. 



