290 REPORT OF STATE GEOLOGIST. 



often obsolete. Face nearly vertical. Eyes oblong, oval, prominent. 

 Antennas of medium length, filiform. Disk of pronotum with the 

 sides sloping on the prozona, the metazona usually flat or nearly so; 

 the front margin truncate, the hind margin either broadly rounded 

 or, in some males, obtuse angled; the median carina low but distinct, 

 cut three times by the transverse sulci; the lateral carina wanting. 

 Lobes of mesosternum longer than broad. Tegmina always fully de- 

 veloped. Inner wings of large expanse, transparent or nearly so. 

 Hind femora slender, usually equaling or exceeding tip of abdomen. 

 Hind tibiae with smooth margins, and with numerous spines in regu- 

 lar rows on each side, but with no apical spine on the outer margin. 

 Second tarsal joint only half as long as the first. Male with cerci 

 oblong and of nearly equal breadth throughout; the sub-genital plate 

 strongly upcurved, its apex deeply notched. Valves of ovipositor 

 strongly exserted. 



Eleven species of the genus occur in the United States. Of these, 

 four have been taken in Indiana. 



KEY TO INDIANA SPECIES OF SCHISTOCERCA. 



0. Antennoe of male not more than one-fourth longer than head and pro- 

 notum together. 



h. Size very large. Tegmina of female much exceeding the ab- 

 domen. Disk of pronotum flat or nearlj^ so, the median stripe 



broad 55 americaua. p. 290 



hb. Size small. Tegmina of female but little if any exceeding the 

 abdomen. Disk of pronotum with sides distinctly sloping, the 



median stripe confined to the carina 50 damnifica. p. 293 



oa. Size, medium. Antennae of male one-third or more longer than the 

 head and pronotum together. 



c. General color yellowish l)rown or olive green; a distinct 

 pale yellow mid-dorsal stripe on head, pronotum and 



closed tegmina 57 alutacca, p. 294 



cc. General color rusty brown. No yellow stripe on dorsal sur- 

 face 58 rubiginosa, p. 296 



55. SoHiSTOCEROA AMERICANA (Drury). The American Locust. 



G)n/Um ameriranm (Drury), 48, I, 1770, 128, Plate 49, Fig. 2. 



Acridliim amrnramnn Scudd., 14 1, VH, 1862, 466; Ratliv., 109, 1862, 

 385, Fig. 25; Thom., 202, V, 1865, 448, 452; Id., 206, V, 

 1873, 172, Fig. 8; Id., 2 1 1 , IX, 1880, 91, 129, Fig. 10; GIov., 

 62, 1872, Plate I, Fig. 15; Riley, I 1 7, VUI, 1876, 103, Fig. 40; 

 Id., 118, IX, 1877, 84, Fig. 17; Id., 2 14,1,1878,236,448, 

 Fig. 6; Id., 122, H, 1884, 194, Fig. 269; Comst., 4 1, 1888, 

 106, Fig. 96; Beut., 3, VI. 1894, 304, Plate IX, Fig. 3. 



Arridinm (Schistocfrrd) ununainum Stal, 200 I, 1873, 66. 



