160 THE UNIVERSITY SCIENCE BULLETIN. 



Deltocephalus balli Van D. 



Deltocephalus balli Van D., Check List Hemip., p. 71, 1916. 

 Deltocephalus nigrifrons Van D., Trans. Am. Ent. Soc., xxi, p. 293, 1894. 

 Deltocephalvs nigrifrons O. & B. Proc. la. Acad. Sci., iv, p. 218, 1897 (in part). 

 Deltocephalus niyrifrons Bak., Psyche, viii, p. 116, 1897. 

 Deltocephalvs nigrifrons Osb., Me. Agr. Exp. Sta., Bui. 238, p. 122, 1915. 

 Deltocephalua nigrifrons DeL., Tenn. St. Bd. Ent., Bui. 17, p. 50, 1916. 

 Deltocephalus balli Van D., Cat. Hemip. N. A., p. 650, 1917. 

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



Form: Length, 2.5 to 4 mm. Vertex over half wider than long, sloping, 

 broadly rounding with front, obtusely angulated or broadly rounding api- 

 cally. Pronotum distinctly longer than vertex, lateral margins very short, 

 humeral margins long. Elytra long and narrow, much exceeding ab- 

 domen. 



Color: Yellowish-green. Vertex yellowish with row of apical black 

 spots. Pronotum showing five pale stripes. Scutellum with basal angles 

 and apex reddish, and the transverse impressed line black. Elytra with 

 light nervures, cells often fuscous. Face almost black with coalescing 

 arcs. 



External genitalia : Female, last ventral segment longer than preced- 

 ing, narrowed posteriorly, posterior margin broadly emarginate ; pygofers 

 long and broad, broadest at middle, spined on distal half, nearly equalling 

 ovipositor. Male, last ventral segment wider than preceding, concave 

 posteriorly; valve broad but short, rounded posteriorly; plates broad at 

 base, spined margins tapering to acute apices; pygofers bearing long 

 spines, acute, and exceeding plates apically. 



Distribution: Records are at hand only from Riley county, 

 but it probably occurs well over the state. 



Hosts: Grasses and weeds. De Long records it on wheat 

 and rye. 



Deltocephalus sonorus Ball. 



Deltocephalus sonorus Ball, Can. Ent., xxxii, p. 344, 1900. 

 Deltocephalus sonorvs Van D., Bui. Buf. Soc. Nat. Sci., ix, p. 220, 1909. 

 Deltocephalus sonorus Osb., U. S. Dept. Agr., IMv. Ent., Bui. 108, p. 79, .1912. 

 Deltocephalus sonorus Van D., Cat. Hemip. N. A., p. 651, 1917. 



Form: Like balli but more slender. Length, 3.25 mm. Vertex dis- 

 tinctly broader than long, sloping, broadly, rounded apically. Pronotum 

 distinctly longer than vertex, lateral margins very short, humeral mar- 

 gins long. Elytra long and narrow, venation distinct. 



Color: Fuscous; vertex pale yellow with six marginal black spots, 

 the middle ones larger than the others, and back of each spot a light brown 

 spot on disc. Pronotum greenish-yellow with five light longitudinal lines. 

 Elytra subhyaline, nervures light, often margined with fuscous. Face 

 fuscous with light median line and arcs. 



External genitalia.: Female, last ventral segment half longer than 

 preceding, lateral margins narrowed posteriorly, posterior margin slightly 

 emarginate medially; pygofers rather narrow and long, spiny on distal 



