66 THE UNIVERSITY SCIENCE BULLETIN. 



marked with dark-brown, scutellum with large, dark, triangular basal 

 marks, and light-brown median band between the two, and two similar 

 light-brown bands on posterior portion. Face with dark band above 

 ocelli, and other irregular markings. Elytra hyaline, with nervures al- 

 ternately light and dark, and differing from alternatus and verticis by 

 having the cross nervure between the sectors broadly white. 



External genitalia: Female, last ventral segment medially produced 

 posteriorly and slightly notched; pygofers broad and long, only slightly 

 exceeded by tip of ovipositor. Male, last ventral segment with very short 

 lateral margins, posterior margin greatly produced posteriorly, forming a 

 very large obtusely-pointed median projection; plates short and stout, 

 exceeded by tips of pygofers; antennae without discs. 



Distribution: Douglas, Riley, and Wallace counties are the 

 only ones in which specimens have been taken. 



Host: Cottonwood. 



Idiocerus alternatus Fh. 



Idiocerus alternaUis Ph., Homop. N. Y. St. Cab., p. 59, 1851 

 Bythoseopus alternatus Walk., List Homop., Ill, p. 876, 1851. 

 Idiocerus interruptus G. & B., Hemip. Colo., p. 74, 1895. 

 Idiocerus alternatus O. & B., Proc. Dav. Acad. Sei., VII, pp. 70, 131, 1898. 

 Idiocerus alternatus Osb., 20th Kept. N. Y. St. Ent., p. 506, 1905. 

 Idiocerus alternatus Osb., Me. Agr. Exp. Sta., Bui. 238, p. 93, 1915. 

 Idiocerus alternatus DeL. Tenn. St. Bd. Ent., Bui. 17, p. 10, 1916. 

 Idiocerxhs alternatus Vau D., Cat. Hemip. N. A., p. 577, 1917. 

 Idiocerus alternatus liathr., S. C. Agr. Kxp. Sta., Bui. 199, p. IS, 1919. 



Form: Smaller and not as robust as preceding species. Length, 5 to 

 5.25 mm. 



Color: Brownish species, much as in preceding species. Vertex with 

 two small, black spots. Broad median white band on pronotum and ex- 

 tending on to vertex. Elytra with nervures alternately light and dark, 

 a distinct broad light band across the tips of the outer claval nervures 

 and a smaller one at the tip of the clavus; cross nervure between the 

 sectors dark. 



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

 gins truncate or slightly sinuate, with faint median notch, lateral mar- 

 gins strongly narrowed posteriorly; pygofers broad and long, but ex- 

 ceeded by the ovipositor for a third their length. Male, ventral segment 

 very short except for two large lateral lobes which are separated by a 

 wide and deep median incision in which is a very small median lobe; 

 plates, slightly exceeded by the long pygofers; antennal discs nearly 

 circular. 



Distribution: So far, we have records of the collection of this 

 species from four northern counties, namely : Douglas, Riley, 

 Decatur and Rawlins. 



Hosts: Willows. 



