SCUDDER. — THE GENUS SCHISTOCERCA. 471 



1 (^ , 2 9 , San Jose del Cabo, Mex., Cal. Acad. Sc. (Bruner) ; Chi- 

 huahua, Mex. (Morse). 



All the specimens have been immersed in alcohol. 



36. Schistocerca perturbans sp. nov. 



Of rather large size, moderately slender, testaceous. Head not very 

 large, testaceous, with a pair of obscure, diverging, fuscous stripes on the 

 vertex ; frontal costa contracted feebly at summit and just below the 

 ocelhis, gradually broadening below, sulcate at and below the ocellus ; 

 eyes longer than the infraocular portion of the gense ; antennae luteo- 

 testaceous. Pronotum rather feebly tectate, testaceous, obscurely infus- 

 cated on the sides of the disk, especially posteriorly, and also below the 

 middle of the lateral lobes, where the fuscous cloud is abruptly and 

 obliquely delimited below ; median carina rather coarse, percurrent ; 

 prozona anteriorly produced and angulato-rotundate, scarcely shorter than 

 the metazona, wliich is laterally shouldered and posteriorly only a little 

 obtusangulate, the angle generally narrowly rounded. Prosternal S2)ine 

 strong, cylindrical, blunt, erect. Tegraina very much surpassing the 

 abdomen, rather slender, testaceous, the median area proximally obscured 

 feebly with fuscous, distally faintly and rather profusely maculate with 

 fuscous in obliquely transverse stripes ; wings hyaline, feebly infumate 

 in apical half, basally very feintly lutescent, the veins luteo-ferruginous. 

 Hind femora testaceous, the outer face hoary, the genicular arc fuscous ; 

 hind tibite luteo-testaceous, the spines with black tips. 



Length of body, 43 mm. ; antennae, 19 mm. ; tegmina, 51 mm. ; hind 

 femora, 2G.5 mm. 



5 9 • Paramaribo, Dutch Guiana, Richardson (Mus. Comp. Zool.) ; 

 Para and Rio de Janeiro, Brazil, Thayer Exp. (Mus. Comp. Zool.). 



All the specimens have been long immersed in alcohol. 



37. Schistocerca bivittata. 



* 

 Grjillus flavkornis var. 5, € Thunb., Mem. Acad. St. Petersb., V. 226 (1815) t. Stal. 

 Acridium {Schistocerca) biviltatum Stal, Rec. Orth., I. 66 (1873). 



I have not seen this species, the provenance of which is unknown. It 

 comes pretty certainly from South America. 



