276 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



EE. Lobes of furcate portion of production of disto-dorsal abdominal 

 segment compressed laterad and at least twice as long as broad. 

 F. Lobes of furcate portion of production of disto-dorsal abdominal 

 segment not obliquely compressed, not emarginate mesad. 



ungulata Scudder 

 FF. Lobes of furcate portion of production of disto-dorsal abdom- 

 inal segment obliquely compressed, emarginate mesad. 

 G. Lobes of furcate portion of production of disto-dorsal ab- 

 dominal segment very weakly emarginate mesad. Form 



moderate robust cuneata Morse 



GG. Lobes of furcate portion of production of disto-dorsal ab- 

 dominal segment deeply emarginate mesad. Form exceed- 

 ingly slender mexicana (Saussure) 



Differential Characters found in the Ovipositor 



Three species, septentrionalis, hemidactijla and ungidata have the 

 ovipositor with both dorsal and ventral margins evenly and 

 broadly arcuate, the latter species is further distinguishable by hav- 

 ing the apex of this organ acute, not rounded as in all the other 

 species of the genus. This broadly arcuate type of ovipositor is 

 found in curvicauda laticauda also, but a suggestion of a sudden 

 upward bend is shown in the dorsal margin; in this species the 

 ovipositor is extremely broad with basal and mesal width sub- 

 equal. This same type of ovipositor is found in curvicauda curvi- 

 cauda, curvicauda horealis and pistillata, but in these the sudden 

 upward bend of the dorsal margin is more decided and the ovi- 

 positor is not as broad, though with basal and mesal width sub- 

 equal. In furcata furcata, furcata furcifera, paronae and cuneata 

 a narrower ovipositor is found with a marked sudden upward 

 bend of the dorsal margin and with the basal and mesal width 

 subequal; in furcata furcifera the race develops an aberrational 

 form in the southwestern United States in which the ovipositor 

 is similar but very decidedly broader. In the remaining species, 

 texensis, strigata and mexicana, not only is the dorsal margin of the 

 ovipositor very suddenly and decidedly bent upward, but the 

 shaft becomes narrower beyond this bend so that the ovipositor 

 is much broader at the base than mesad. 



When taken in conjunction with the differential characters of the 

 various species it may be seen that females of all of the species are 

 readily separable excepting those of furcata furcata and cuneata. 



