IOWA ACADEMY OF SCIENCES. 245 



rupted are scarcely distinguishable except by form of clypeus. 

 Usually, however,, smii/ii has a broad, unbroken band, without 

 any traces of spots on the vertex, but with the border of loras 

 next clypeus with a broad black line, exaggerating the width 

 of clypeus, while^/biliata seldom or never has the quadrate spots 

 of the frontal band coalesced, and the loree, while sometimes 

 slightly spotted with black, lack the line next the clypeus. 

 The greater length and narrower tip of the clypeus, and the 

 broader, more truncate, male plates are the decisive structural 

 characters. 



THAMNOTETTIX CYPERACEUS N. SP. 



Hesembles melinogaster but larger and usually more deeply colored, and 

 with three parallel croceus stripes on head and pronotum. Length to tip 

 of elytra, female, 6 mm.; male, 5.25 mm. 



Vertex nearly twice as wide on the middle as next the eye, angulate at 

 tip, the margin sharply angular, front narrowing evenly to clypeus, scarcely 

 emarginate next antenna?; clypeus slightly widened and more nearly trun- 

 cate at the apex; gente evenly rounded. Pronotum long, about one-half 

 longer than vertex, slightly concave behind, lateral and humeral angles 

 rounded. Elytra long, the nervures distinct, claval nervures parallel. 



Color: A broad stripe and a narrower median one on the head; pro. 

 notum and scutellum tawny, alternating with yellow. Ocelli red. Four 

 transversely linear spots just below the margin of the vertex (not, or 

 scarcely visible, from above) the insertion of antenna? and the lateral mar- 

 gins of front,dorsum of abdomen except margin and terminal segment, disk 

 of venter and ovipositor black. Elytra tawny hyaline with whitish nervures. 

 Margin of abdominal segments yellow or tinged with rufous posteriorly. 



Genitalia: Female, ultimate ventral segment scarcely longer than 

 penultimate, very slightly emarginate on either side of the middle of 

 posterior border. Male, valve produced, large, and rounded posteriorly, 

 with a median impressed line at the tip; plates short, obtuse, and thick at 

 the apex, with dense tufts of hairs'and a conspicuous bristle arising from 

 extreme tip; pygofers short, hairy. 



Described from four males and four females collected from 

 Carex at Ames, Iowa, October 6, 1897. In the disposition of black 

 markings this species almost duplicates melanogaster, but it is 

 much larger, the male genitalia are quite different, and other 

 characters will easily separate them. 



THAMNOTETTIX PALLIDULA N. SP. 



Smaller and lighter colored than wetor(Ogas(erand with the under surface 

 pallid. Approaches Jik7a but markings are less distinct. Six points in a 

 line across the front part of vertex, either all black or part or all of them 

 faint or obsolete. Length to tip of elytra, 4 mm. 



18 [la. Acad. Sci., Vol. v.") [July 20, 1898.] 



