460 FAMILY VII. TBTTIGONIID.E. THE KATYDIDS. 



&. Tegmina distinctly shorter than wings, their apex not broadly 

 obliquely truncate (Fig. 157, a) ; apex of ovipositor not acumi- 

 nate. 



c. Tegmina long, narrow, but little or slightly broader at middle 

 than at apex; fastigium of vertex horizontal or but feebly de- 

 flexed, but little if any wider than basal joint of antennse. 



d. Middle femora unarmed beneath; eyes subglobose; subgenital 



plate of male long, slender, upcurved, its apical notch usu- 

 ally V-shaped. II. SCUDDERIA. p. 462. 

 eld. All the femora spinulose beneath; eyes oblong-oval, one-half 

 longer than wide; subgenital plate of male short, broad, 

 nearly straight, its apical notch broad and rounded. 



III. SYMAIKTROPLEURA, p. 475. 

 cc. Tegmina broad, distinctly wider at middle than at extreme apex. 



e. Fastigium of vertex deflexed to nearly the same plane as the 

 frontal fastigium, obtuse, usually twice or more than twice as 

 as wide as first antennal joint. 



/. Hind femora long, reaching to or beyond apical fourth of 

 tegmina; fore and middle tibiae flat or sulcate above, 

 their margins raised, acute; tegmina oblong-elliptical or 

 ovate; ovipositor long, curved gradually upward, usually 

 strongly serrate on both edges. IV. AMBLYCORYPHA, p. 476. 

 ff. Hind femora shorter, stouter, not reaching beyond apical 

 third of tegmina; fore and middle tibiae smooth and 

 rounded above without angular margins; tegmina ovate- 

 lanceolate, sometimes very broadly so; ovipositor short, 

 bent abruptly upward, finely or not at all serrate. 

 g. Disk of pronotum flat, its margins rounded or subacute, 

 entire; smaller, length of body not over 33, of tegmina, 

 not over 50 mm. V. MICROCEXTRUM. p. 484. 



gg. Disk of pronotum concave, its margins elevated and 

 crenulate; larger, length of body 37 or more, of teg- 

 mina 60 or more mm. ( Fig. 163, a. ) 



VI. STILPXOCHLORA. p. 489. 



ee. Fastigium of vertex not as wide as basal joint of antennae, 

 but slightly deflexed and meeting the narrower frontal fas- 

 tigium at almost a right angle; disk of pronotum coarsely 

 and thickly punctate; length of tegmina not over 33 mm. 



VII. TURPILIA, p. 492. 



&&. Tegmina as long as or slightly longer than wings, very broad, the 

 apex obliquely truncate; apex of ovipositor acuminate; fore 

 and middle tibia? flat or sulcate above, their margins raised, 

 acute. VIII. PHRIXA, p. 493. 



I. ARETH^A Stal, 1870, 55. 



Elongate, very slender species, having the face flat, perpen- 

 dicular, fastigium triangular, clej tressed, declivent, sulcate, con- 

 tinuous with the front; antenna? very long, slender, the basal joint 

 twice as long as broad, set in shallow, widely margined sockets; 

 pronotum saddle-shaped with faint median rarina ; prozona with 



