190 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



F.2 Tegmina distinctly spotted ; lateral carinas of the pronotum strongly 

 sinuate ■ 21. — Plectrophorus, n. gen. 



E.2 The vertex bounded in front by a raised line, viewed from the side 

 it forms a more or less distinct angle with the face or it is not at 

 all angulate. 



F.' Median carina of the pronotum high and sharp, cut by the prin- 

 cipal sulcus in, or plainly in front of, the middle. Intercalary vein 

 verystrong. Apical spurs on the inner side of the posterior tibiae 

 subequal 22. — MecostetJius, Fieb. 



F.2 Median carina of the pronotum rarely cut plainly in front of the 

 middle, in this case it is not high and sharp, or. the intercalary 

 vein is not strong. (In Stirapleura and Psolocssa the intercalary 

 vein is present but not very strong and the inner apical spurs of 

 the posterior tibiae are very unequal). 



G.' Lateral carinre of the pronotum entirely obsolete even on the met- 

 azone and the anterior of the prozone. Scapular area of the teg- 

 mina of the male forming a conspicuous musical organ. 



H.^ Vertex of the head forming an acute angle with the face; tempora 

 nearly plain triangular spaces 23. — Bootettix, Bruner. 



H.2 Vertex of the head forming an obtuse angle with the face. Tem- 

 pora impressed, trapezoidal. . . . 24. — Ligurotettix, n. gen. 



G.2 Lateral carinae of the pronotum usually distinct, present at least 

 upon the metazone and the anterior part of the prozone. 



H.' Tempora elongate, narrow, from two to four times as long as 

 broad. The apical spur on the inner side of the posterior tibiae 

 is much less than twice as long as the one beside it. 



I.' Antennas filiform. 



J.' Median carina of the pronotum cut in the middle. Posterior mar- 

 gin of the pronotum plainly more angulate than the antetior. 

 25. — Stenobothrus, Fisch. 



J. 2 Median carina of the pronotum cut plainly behind the middle. 

 Posterior margin of the pronotum not more angulate than the an- 

 terior. . 26. — Brunneria, n. gen. 



1.2 Antennae clavate 27. — Gomphoceri/s, Thunb. 



H.2 Tempora short, little more than once as long as broad or, when 

 twice as long, the apical spur on the inner side of the posterior 

 tibiae is twice as long as the one beside it. 



I.' Posterior margin of the metazone straight or just perceptibly an- 

 gulate. Pronotum shorter than the head, which is very large. 

 28. — F?iigodes, n. gen . 



