NO. 1124. EE 'VISION OF THE MELAyOPLTSCUDDER. 



ANALYTICAL, KEY TO THE GENERA OF NORTH AMERICAN MELANOPLI 

 (INCLUDING THE OLD WORLD FORMS). 1 



A 1 . Lateral margins of subgenital plate (last ventral segment) of male, as seen later- 

 ally, straight throughout, or very slightly convex, never at all abruptly ampliate 

 at the base. 

 ft 1 . Bony exceptionally slender; mesosternal lobes subattingent in both sexes; pro- 



zona three times as long as metazona 1. Gymnoscirtetes (p. 14). 



ft-. Body not exceptionally slender; mesosternal lobes in both sexes so widely sep- 

 arated that the interspace between them is at most twice as long as broad ; prozona 

 not more than twice as long as metazona. 



c 1 . Interspace between mesosternal lobes of female decidedly transverse, some- 

 times twice as broad as long; of male sometimes transverse, sometimes quadrate 

 or subquadrate; tegmina lobiform, linear, or wanting. 



d 1 ' Interspace between mesothoracic lobes of male decidedly transverse, as 

 broad as or broader than the lobes; the pronotum without lateral carinae; 



tegmina ovate or wanting 2. Netrosoma (p. 16). 



- d*. Interspace between mesothoracic lobes of male quadrate or subquadrate, 



or, if feebly transverse (as in Paradichroplus), not so broad as the lobes, and 



then the pronotum furnished with lateral carinae; tegmina ovate or linear. 



c 1 . Subgenitnl plate of male pyramidal, pointed, a slight tubercle extending 



beyond its posterior margin, but the margin extending well beyond the apex 



of the supraanal plate 3. Paradicliroplua (p. 18). 



e''. Subgenital plate of male more or less conically protuberant apically, but 

 its interior apical margin not surpassing or barely surpassing the apex of the 

 supraanal plate. 



/'. Apical tubercle of subgenital plate small, extending but a short dis- 

 tance beyond the supraanal plate; cerci of male abruptly narrowed before 

 the middle by excision of the inferior margin, the apical half narrow; lat- 

 eral carinae of pronotum wholly wanting 4. Phaedrotettix (p. 22). 



/ 2 . Nearly the whole subgenital plate forming a blunt conical tubercle 

 projecting some distance beyond the supraanal plate; cerci of male form- 

 ing broad, apically decurved, subfalcate laminae; lateral carinae of pro- 



notuui more or less distinct 5. Conalcaea (p. 23.) 



c. Interspace between iresosternal lobes of female generally longer than broad, 

 sometimes quadrate rarely feebly transverse 2 ; of male never at all transverse 

 (except feebly in Siualoa and Cephalotettix) ; tegmiua variable. 

 d j . Tegmiua never fully developed, rarely as long as the prouotum, lateral 

 and ovate, or linear, or wholly wanting; hind margin of pronotum distinctly 

 truncate; fore and middle femora of male (except in Phaulotettix) distinctly 

 more gibbous than in the female. 



e 1 . Furcula of male wanting or forming a pair of brief lobes at most no 

 longer than broad. 



1 By permission of the Assistant Secretary this key has been issued in advance in 

 the Proceedings of the American Academy, XXXII, No. 9. 



2 CephalotcttijL, in which the female is unknown, is placed in this division. 



