148 THE UNIVERSITY SCIENCE BULLETIN. 



acute apically in female, more rounded in male. Vertex long, not twice 

 as wide as long, strongly convex antei-iorly, lateral margin very short, 

 long humeral margins rounding to slightly concave, posterior margin. 

 Elytra long and slender, exceeding abdomen. 



Color: Greenish-yellow; vertex yellowish with two brown lines ex- 

 tending from apex to base. Pronotum yellowish-green, sometimes with 

 two brown longitudinal lines. Scutellum yellow. Elytra yellowish-green, 

 subhyaline, nervures brighter. Face pale fuscous with pale arcs. 



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

 preceding, narrowed posteriorly, posterior margin strongly and round- 

 ingly produced, unicolorous; pygofers long and narrow, equalling or 

 slightly exceeded by ovipositor, sparsely bristled. Male, valve small, 

 triangular, apex subacute, smaller and more acute than in minimus, 

 plates long and narrow, spiny margined, apices acute. 



Distribution: Collected in large numbers in Ottawa county. 



Hosts: Professor Gillette reports this species on short 

 prairie grasses. The writer swept them in abundance from 

 pastures composed chiefly of Bouteloua and Buchloe. 



Deltocephalus dehilis Uhl. 



Deltocephalus dehilis Uhl., Bui. U. S. Geol. Geog. Surv., i, p. 360, 1876. 

 Deltocephalus melsheimeri Osb., Proc. la. Acad. Sci., 1, pt. 2, p. 126, 1892^ 

 Deltocephalvs dehUis O. & B., Proc. la. Acad. Sci., iv, p. 210, pi. 23, fig. 2, 1897. 

 Deltocephahis dehilis Osb., 20th Kept. N. Y. St. Ent., p. 520, 190.^. 

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

 Deltocephalus dehilis Van D., Cat. Hemip. N. A., p. 646, 1917. 

 Deltocephalus dehilis Lathr., S. C. Agr. Exp. Sta., Bui. 199, p. 65, 1919. 



Form: Larger and more robust than two preceding species. Length, 

 3 to 4.75 mm. Vertex longer than wide, or width equal to length, acutely 

 angled. Pronotum not over twice as broad as long, strongly convex an- 

 teriorly, lateral margins very short, humeral margins rounding into 

 slightly concave posterior margin. Elytra varying in length, sometimes 

 shorter, usually longer than abdomen. 



Color: Greenish; vertex, anterior portion of pronotum and .scutellum 

 yellow, median line of vertex and ocelli black. Elytra subhyaline with 

 veins light. Face bi ownish with pale arcs and median line. 



External genitalia : Female, last ventral segment long, posterior 

 margin rounded with narr^w, deep, median notch or sometimes nearly 

 truncate with a shallow notch between two small lobes; pygofers broad, 

 broadest at middle, and sparsely spined, equalling or slightly exceeded by 

 ovipositor. Male, last ventral segment shorter than preceding, valve 

 roundingly produced posteriorly; plates together as broad at base as 

 long, margins spined, each with a black spot, apices obtuse, exceeded by 

 the acutely pointed and long-bristled pygofers. 



Distribution: Collected in Douglas and Pottawatomie coun- 

 ties. 



Hosts: Found on low grounds and in wooded regions. 



