156 THE UNIVERSITY SCIENCE BULLETIN. 



External genitalla: Female, last ventral segment consisting of two 

 membranes, the lateral margins only of the inner one visible from under 

 the outer membrane which is about half as long as it is wide, much 

 narrowed to slightly rounded nearly truncate posterior margin ; pygofers 

 broad, distally spined and equalling the ovipositor. Male, last ventral 

 segment as long as preceding, distinctly shortened medially by the broadly 

 rounded excavation of the posterior margin; valve large, margins dis- 

 tinctly concave medially and then rounding to obtuse apex; plates broad, 

 spiny mai-gins quickly narrowing to the attenuate and acute tips; py- 

 gofers densely bristled, their acute tips exceeding the plates. 



Distribution: Taken in Cherokee county only. 



Hosts: De Long reports this species from small grasses. 



Deltocephalus compactus 0. & B. 



Deltocephalus compactus O. & B., Proc. la. Acad. Sci., iv, p. 217, pi. 25, fig. 3, 1897. 

 Deltocephalus compactus Osb., 20th Rept. N. Y. St. Ent., p. 521, 1905. 

 Deltocephalus compactus DeL., Tenn. St. Bd. Ent., Bui. 17, p. 52, 1916. 

 Deltocephalus compactus Van D., Cat. Hemip. N. A., p. 643, 1917. 

 Deltocephalus compactus Lathr., S. C. Agr. Exp. Sta., Bui. 199, p. 63, 1919. 



Form: Much like ^veedi. Length, 2.75 mm. Vertex with length 

 equalling width or slightly longer, disc sloping and roundingly meeting 

 front, quite obtuse apically. Pronotum as in obtectus. Elytra short, 

 broad, sometimes nearly equalling abdomen, sometimes exceeding it, 

 clavus reticulated, central anteapical cell divided. 



Color: Very much like weedi, brown; vertex yellowish, with ocelli, a 

 pair of spots inside them and a pair at apex, black, a large broad pair 

 light brown and curved marginally, a pair of transverse median and 

 median longitudinal lines, black. Pronotum brown with the five faint 

 longitudinal lines. Scutellum with basal angles and two spots on disc, 

 dark. Elytra brown with nervures broadly light and usually heavily 

 margined with fuscous. Face black with light arcs. 



External genitctlia: Female, last ventral segment consisting of two 

 membranes as in obtectus, the inner deeply and circularly emarginate 

 behind, nearly covered by the outer membrane which is twice as broad 

 as long, with its posterior margin roundingly and medially produced; 

 pygofers broad, distally spined, exceeded by the ovipositor. Male, last 

 ventral segment as long as preceding except medially, due to broad and 

 angular excavation of the posterior margin ; valve small, posterior margin 

 slightly rounded; plates broad at base, but with spiny margins concavely 

 narrowed to attenuated and acute apices, which exceed the short, bristly 

 pygofers. 



Distribution: Taken in Pottawatomie county. 

 Hosts: Osborn and Ball report this species from Sporobolus 

 hookeri; De Long reports it as abundant on Aristida gracilis. 



