168 THE UNIVERSITY SCIENCE BULLETIN. 



AA. Vertex not distinctly transverse — concluded. 



DD. Species more elongate, elytra longer than abdo- 

 men; anterior and middle legs with the black fen- 

 ora orange-tipped. striatulus. 



CC. Margin of vertex with four black spots; pronotum 

 striped with black and with four stripes on each elytron. 



CO mnia. 



BB. Vertex narrow, its basal width rarely equal to its middle 

 length. 



C. Face marked with a fuscous "Y"; ovipositor rarely ex- 

 tending beyond elytra. curtisii. 

 CC. Face without fuscous "Y"; ovipositor usually extending 

 beyond elytra. 

 D. Face with a transverse white band below eyes, pro- 

 notum black and yellow. bicolor. 

 DD. Face unicolorous; pronotum with a row of sub- 

 marginal spots. ob tutus. 



Euscelis magnus (O. & B.). 



Alkysanus magnus O. & B., la. Acad. Sci., iv, p. 225, pi. 26, fig. 2, 1897. 

 Athysanus magnus O. & B., Ohio Nat., ii, p. 273, 1902. 

 EusceKs magnus Van D., Cat. Hemip. N. A., p. 65.5, 1917. 



Form: Very large and robust, by far the largest member of the genus. 

 Length, 7 to 8.5 mm. Vertex practically parallel-margined, four times as 

 wide as long, broadly rounding with front. Pronotum transverse, about 

 three times as wide as long, nearly parallel-margined, lateral margins 

 long and parallel, humeral margins broadly rounding with emarginate 

 posterior margin, disc distinctly transversely wrinkled. Elytra broad, but 

 distinctly exceeding the abdomen. 



Color: Ashy-gray; vertex yellowish, sparsely irrorate, with brown 

 along anterior and posterior margins, so that there seems to be a light 

 transverse band between. Pronotum brownish, with a transverse yellow 

 band just back of the middle. Elytra with light nervures marked with 

 brown, the center of the cells irrorate with brown and the costal margin 

 yellowish-white. Face yellow, irrorate vnth brown. 



External genitalia: Female, last ventral segment scarcely longer 

 than the preceding, lateral margins produced and broadly rounded, 

 posterior margin deeply and broadly emarginate between the lateral 

 lobes, slightly produced medially and with a distinct notch, so that there 

 seem to be two small median lobes; pygofers robust and long, nearly 

 equalling ovipositor, with a distinct longitudinal depression on the sides 

 along apical third, bearing a few short spines distally. Male, valve tri- 

 angular, narrow, about half the length of the last ventral segment, apex 

 obtuse; plates nearly three times the last ventral segment, spiny margins 

 rounding basally, then tapering to long acute tips which exceed the short 

 bristly pygofers. 



Distribution: Specimens are at hand from Douglas and 

 Neosho counties. Reported also from Pottawatomie county. 



Hosts: Osborn and Ball report taking this species from 

 Spartina cijnosuroides exclusively. 



