SUBFAMILY III. LOCUSTIX.K. 311 



costa, its sides low, indistinct, median cariiia wanting, foveolae 

 very small, often obsolete ; face nearly vertical ; eyes oblong-oval, 

 prominent ; antennae of medium length, filiform ; disk of pronotum 

 with sides sloping on prozoua, metazona usually flat or nearly so, 

 front margin truncate, hind margin either broadly rounded or, 

 in some males, obtuse-angled, median carina low but distinct, cut 

 three times by the transverse sulci, lateral carinae wanting ; lobes 

 of mesosternum longer than broad; tegrnina always fully devel- 

 oped; wings of large expanse, transparent or nearly so; hind 

 femora slender, usually equalling or exceeding tip of abdomen; 

 hind tibiae with numerous spines in regular rows on each side; 

 second tarsal joint only half as long as first. Males with cerci 

 wide, oblong, usually of nearly equal breadth throughout; sub- 

 genital plate strongly upcurved, its apex deeply notched. Valves 

 of ovipositor strongly exserted. 



This is a large, typically American genus, all of the species, 

 according to Stal, its founder, being American or of American 

 origin. Kirby (1910, 454) recognized 73 species, a number of 

 which are known synonyms. Of these 12 were accredited to the 

 United States, the others mostly to Mexico, Central and South 

 America. We have in the p]astern States four species and two 

 races or varieties. 



KEY TO EASTERN SPECIES OF SCHISTOCEBCA. 



a. Median or discoidal area of tegmina with large, distinct isolated red- 

 dish-brown spots; disk of pronotum flat or nearly so, and with a 

 broad pale median stripe; cerci of male feebly but distinctly taper- 

 ing from base to apex. 134. AMERICANA 

 aa. Median area of tegmina of males usually immaculate, of females 

 sometimes with numerous small vague fuscous spots or dots; disk 

 of pronotum more or less distinctly tectiform, its median pale stripe, 

 when present, narrow; cerci of male of nearly equal breadth 

 throughout. 



~b. Antenna? of male one-third or more longer than head and prono- 

 tum together; anal area of tegmina usually with a distinct pale 

 stripe; larger, the female 45 or more mm. in length. 

 c. Hind tibiae reddish-yellow or pale brown in hue; notch of sub- 

 genital plate of male U-shaped, about as broad as deep; gen- 

 eral hue of tegmina dark olive-green or rusty brown; length 



of body, female, usually less than 50 mm. 



(I. Head, thorax and anal area of tegmina with a pale dorsal 



median stripe; tegmina immaculate; pronotum distinctly 



tectate; fastigium more elongate. 135. ALUTACEA. 



eld. Dorsal surface without pale median stripe; tegmina usually 



with distinct fuscous spots; pronotum feebly tectiform; 



fastigium shorter. 135a. RTJBIGINOSA. 



cc. Hind tibiae blackish purple; notch of subgenital plate of male 



