188 THE UNIVERSITY SCIENCE BULLETIN. 



plates a little longer than basal width, margins spiny, acute apices 

 equalling or exceeding pygofers. 



Distribution: Taken in Douglas, Pottawatomie, Riley and 

 Clark counties. 



Hosts: Doctor Ball gives Helianthus as the host of this 



species. 



Mesamia sti^aminea (Osb.). 



Paramesus stramineus Osb., Proc. la. Acad. Sci., v, p. 241, 1898. 



Eiitettix (Mesamia) straminea Ball, Proc. Dav. Acad. Sci., xii, p. 62, pi. 3, fig. 7, pi. 

 4, fig. 7, 1907. 



Mesamia stramirifa Van D., Cat. Hemip. N. A., p. G28, 1917. 



Farm,: That of nigridorsum. Length, 4.5 to 5.5 mm. Vertex slightly 

 longer and more angled than in Jiigridarsum, about twice as wide as 

 long, disc depressed, margin acute. Pronotum about twice as wide as 

 long, lateral margins short. Elytra long and narrow, often flaring, two 

 cross nervures between the sectors, central anteapical cell sometimes 

 divided, with six or seven costal veinlets. 



Color: Straw-colored with a greenish tinge. Vertex with white an- 

 terior and posterior margins, former with an interrupted black line often 

 reduced to four spots, disc yellowish-green. Pronotum anteriorly yel- 

 lowish-green, posteriorly darker, irrorate with brown, the two parts sepa- 

 rated by a darker line which is produced medially. Scutellum olive-brown, 

 basal angles with orange spot, and vnth seven light spots around the 

 edge. Elytra milky-white, subhyaline, disc brownish, nervures brown, 

 costal nervures and apex fuscous, three pairs of white spots along the 

 suture. Face pale, darkening with dark bands above to a black line 

 under the margin of the vertex. 



External genitalia : Female, last ventral segment long, posterior mar- 

 gin broadly and deeply emarginate, with a median lobe which is slightly 

 emarginate apically; pygofers broad, exceeded by ovipositor, sparsely 

 spined. Male, valve very small, rounded posterioi-ly ; plates together 

 forming a triangle a little longer than broad, margins spiny, apices acute, 

 exceeding the pygofers. 



Distribution: Taken in Pottawatomie and Riley counties. 



Hosts: Doctor Ball reports this on the rough-leaved species 

 of Helianthus. 



Mesamia coloradensis (G. & B.). 



AUuf/iis coloradensis G. & B., Hcinip. Colo., p. 91, 1895. 



Paramesus immaculatus Ball, Can. Ent., xs.wii, p. 211, 1905. 



Eutettix (Mesam.ia) coloradensis Ball, Proc. Dav. Acad. Sci., xii, p. 63, 1907. 



Paramesus coloradensis Tuck., Kaiis. Univ. Sci. Bui., iv, p. 66, 1907. 



Mesamia coloradensis Van 1)., Cat. Homip. N. A., p. 628. 1017. 



Form: Like straminea, but smaller. Length, 3.75 to 4.5 mm. Vertex 

 one-half longer on middle than next the eye, about twice as wide as long, 

 depression slight, acutely angled with front, apex a trifle more pointed 

 than in fttratninea. Pronotum about twice as wide as long, lateral mar- 



