. r )S NEW NORTH AMERICAN ACRIDID^ BRUNER. 



near the base and apex, the latter pointed; in the female very short, 

 reaching only to the front edge of the pronotum, in the male a little be- 

 yond its posterior extremity. Pronotum rather short and moderately 

 broad, depressed in the middle, rounded above on the anterior lobe, 

 from which point it expands rapidly posteriorly; lower lateral edges 

 nearly straight, the sides deep, the lower posterior angle square, the- 

 point rounded ; anterior edge slightly rounded, posterior margin broadly 

 rounded. Tegmina and wings reaching beyond the tip of the abdomen 

 in both sexes, rather narrow in the female, the costal field considerably 

 dilated in the male as in Chloealtis and Arcyptera. Posterior femora 

 long and slender, reaching ( 9 ) or extending past the tip of the body 

 ( 8 ). Prosternum armed with a large, very low, quadrate process. 



Bootettix argentatus sp. nov. [PI. I, Figs. 4, 5.] 



Light green marked with deep ferruginous, brown and black. A 

 series of silvery blotches along the sides and beneath is a distinguish- 

 ing character. Body and limbs hirsute. About au inch in length. 



Vertex between the eyes quite broad, nearly as wide as the shortest 

 diameter of the eyes; fastigium pointed, triangular, very shallowly sul- 

 cate and furnished with a minute ceutral longitudinal cariua, lateral 

 margins sharp, abrupt; lateral foveolse elongate, narrow, fading away 

 along their lower edge where the surface is rather coarsely granulate ; 

 lateral ocelli very large and situated lower down the face than ordinarily. 

 Front coarsely punctate, the costa widest above between the antennae, 

 not sulcate, but punctate throughout. Antenna? slightly flattened, 

 nearly twice as long in the male as in the female. Pronotum glabrous, 

 with the anterior lobe equal, rounded above, the posterior lobe rapidly 

 expanding, nearly flat above, well shouldered ; front edge gently ad- 

 vanced upon the occiput, posterior edge broadly rounded, margiuate; 

 transverse impressed lines well defined, continuous, rather sinuous, the 

 last about the middle; median carina visible throughout ( 9 ), or only 

 on the posterior and on the front edge of the anterior lobe. Tegmina 

 long and narrow, the apex rounded, reaching beyond the tip of the 

 abdomen in both sexes; the costal margin considerably dilated in the 

 male, forming the stridulating organ, or rather the " sound board," as 

 in the genus Gomphocerus. Posterior femora long and slender; the 

 tibia? as long as the femora, the spines slender and more numerous than 

 usual. Metasternum furnished with two converging keels which termin- 

 ate near the center at the front edge and are united by a strong cross- 

 piece. Prosternum armed with a short, blunt, quadrangular process. 

 Terminal segment of the male abdomen elongate, wedge-shaped; supra- 

 anal plate elongate cordate, roundly scooped out, the sides bent down 

 so as to clasp the underlying processes. Cerci a little more than twice 

 as long as broad, tapering, blunt. 



General color light transparent green, with a metallic luster. Lateral 

 foveolse and fastigium of the vertex black, changing to plain brown 



