104 THE UNIVERSITY SCIENCE BULLETIN. 



black spot on base of each elytron, just under outer edge of pronotum. 

 The males may be of the same color as the females, or they may be black 

 forms. In the latter, the vertex may be partly or entirely black except 

 for light marks around the ocelli, a pair of light spots on the posterior 

 margin a little further apart than the ocelli and another pair of light 

 spots near the anterior margin a little in front of the eyes. The pronotum 

 may have the disc blackened, showing the pair of black dots, or it may 

 be entirely black except for a strip of light along the lateral margins. 

 The scutellum may have the disc blackened, or it may be entirely black 

 except for touches of light markings near the apex. The elytra are very 

 smoky, but are usually light and hyaline enough to let the black abdomen 

 show through, showing the black spot at the base, as in the female. 



External genitalia: Female, last ventral segment long, longest at lat- 

 eral angles, shortest medially, posterior margin broadly concave with a 

 very small median lobe; pygofers broad and long, slightly exceeding 

 ovipositor and bearing, especially on apical half, a few coarse hairs. Male, 

 valve hidden by last ventral segment; plates broad, obliquely truncate 

 and overlapping apically, exceeded by the large pygofers which bear a 

 few stout hairs laterally. 



Distribution: Specimens have been taken in Pottawatomie 

 and Douglas counties. 



Hosts: Seemingly confined to native grasses. 



In 1905 Professor Osborn suggested that G. melanota 

 Spangb. might be a melanotic form of G. bipunctulata Woodw. 

 Dr. Ball is of the opinion that such is the case and in his col- 

 lection are to be seen the large females and the smaller males 

 of both colors. Many of these were taken together, so there 

 seems to be no doubt as to the synonomy of these two forms. 



Gypona pectoralis Spangb. 



Gypona pectorali* Spangb., Spec. Gyponse, p. 46, 1878. 



Gypona pectoralis Spangb., Ent. Tidskr., i, p. 33, 1881. 



Gypona albimarginata Woodw., Bui. 111. St. Lab. Nat. Hist., iii, p. 31, 1887. 



Gypona hullensis Prov., Pet. Paune Ent. Can., iii, p. 269, 1889. 



Gypona pectoralis Wirtn., Ann. Cam. Mus., iii, p. 220, 1904. 



Gypona pectoralis Van D., Ottawa Nat., xxvi, p. 68, 1912. 



Gypona pectoralis Van D., Cat. Hemip. N. A., p. 614, 1917. 



Gypona pectoralis Gibs., Proc. U. S. Natl. Mus., Ivi, p. 94, 1919. 



Form: Not as broad as preceding species. Length, 8.5 to 10.24 mm. 

 Vertex less than twice as long medially as next to the eye, broadly 

 rounded. Pronotum characteristic of the genus. Elytra long, well ex- 

 ceeding the abdomen, subcoriaceous. 



Color: Brownish; vertex and pronotum having a mottled appearance 

 as does anterior portion of scutellum. Posterior portion of scutellum 

 lighter. Elytra darker than other parts, often having large or small dark 

 spots on the cross veins and sometimes on the cells. 



External genitalia: Female, last ventral segment broad, slightly longer 



