SUBFAMILY III. LOCUSTIN.K. 321 



As pointed out by Scudder (1897, 4), the tribe is almost ex- 

 clusively American, but one (Podisnia) of the 30 genera recog- 

 nized by him being represented in the Old World. Of these 22 

 are represented in America north of Mexico, but only eleven of 

 them in the territory covered by this work. These may be sepa- 

 rated by the following key, which is abridged and modified from 

 that of Scudder. 



KEY TO EASTERN GENERA OF TRIBE MELANOPLI. 



o. Side margins of subgenital plate of male, viewed in profile, straight 

 throughout or very feebly convex, never at all abruptly dilated or 

 widened at base (Fig. 118 a); tegmina and wings wanting or much 

 shorter than abdomen. 



1). Form very slender, subcylindrical; prozona three times as long as' 

 metazona; tegmina and wings wanting; body almost glabrous. 



I. GYMNOSCIRTETES, p. 322. 



bl). Form stout; prozona not over one-half longer than metazona; teg- 

 mina as long as or longer than pronotum, generally half the 

 length of abdomen; body rather thickly pubescent. 



II. CAMPYLACANTHA, p. 325. 



aa. Side margins of subgenital plate of male suddenly dilated or widened 

 to a considerable degree at base (Fig. 118, e) ; if not so widened then 

 the entire margin strongly convex or sinuate; tegmina and wings 

 variable in length, rarely (Podisma and Aptenopedes) wanting. 

 c. Subgenital plate of male with a distinct tubercle at apex, the 

 margins of the plate meeting below the tubercle; cerci of male 

 very slender and tapering. (PI. Ill, o.) 



(I. Median carina of pronotum well developed throughout its 

 length; lateral carina? present on front half of prozona; teg- 

 mina not reaching middle of abdomen; prosternal spine 

 sharply acuminate. III. EOTETTIX, p. 327. 



dd. Median carina feebly developed; lateral carinas wholly want- 

 ing; tegmina usually nearly as long as or slightly longer 

 than abdomen, rarely less than two-thirds its length; pros- 

 ternal spine blunt at apex; general color green, the median 

 pronotal carina reddish-purple. IV. HESPEROTETTIX, p. 329. 

 cc. Subgenital plate of male without a distinct tubercle at apex, or, 

 if present, small and the cerci then very broad. 



e. Interspace between the mesosternal lobes in both sexes much 

 wider than long, as broad as or broader than the lobes them- 

 selves; tegmina usually and typically abbreviate, sometimes 

 wanting. 



f. Head very large, face almost vertical; eyes small, prominent 

 the interocular space nearly as broad as their greatest 

 width; metazona rugulose-punctate; tegmina present, some- 

 times fully developed. V. DENDROTETTIX, p. 337. 

 ff. Head of moderate size, the face slightly oblique; eyes large, 

 less prominent, the interocular space distinctly less than 



