28 GUIDE TO ORTHOPTERA 



h 2 . Spines on the exterior margin of the posterior 

 tibiae not exceeding 15. 



1 1 . Median carina of the pronotum cut in the 

 middle by the principal sulcus. 



j \ Color striped distinctly or obscurely ; 

 scapular area of the tegmina broader than 

 the mediastinal area. 



k 1 . Lateral carinae of the pronotum obso- 

 lete ; median carina accompanied by a 

 supplementary pair upon the disk. 



Amphitomus McNeill. 

 k 2 . Lateral carinae of the pronotum pres- 

 ent; median carina not accompanied by 

 supplementary carinae on the disk. 



Acentetus McNeill. 



j 2 . Color plain ; scapular area of the tegmina 

 not broader than the mediastinal area. 



Amblytropidia Stal. 



1 2 . Median carina of the pronotum cut much 

 behind the middle by the principal sulcus. 



Chloealtis Harris. 



f 2 . Scutellum of the vertex with no distinct median 

 carina. 



g 1 . Median carina of the pronotum cut much 



behind the middle by the principal sulcus. 



h 1 . Posterior margin of the metazona angulate ; 

 tegmina usually much shorter than the abdomen, 

 with the ulnar area not very much wider than the 

 discoidal area. . Dichromorpha Morse. 



A 2 . Posterior margin of the metazona rounded 

 or not distinctly angulate ; tegmina not much 

 shorter than the abdomen, with the ulnar area 

 very wide and several times as broad as the dis- 

 coidal area. . . Glinocephalus Morse. 



g 2 . Median carina cut near the middle by the 



principal sulcus. 



