28 GUIDE TO ORTHOPTERA 



h ^. Spines on the exterior margin of the posterior 

 tibiae not exceeding 15. 



i^. Median carina of the pronotum cut in the 

 middle by the principal sulcus. 

 j ^ Color striped distinctly or obscurely ; 

 scapular area of the tegmina bi'oader than 

 the mediastinal area. 



k^. Lateral carinae of the pronotum obso- 

 lete ; median carina accompanied by a 

 supplementary pair upon the disk. 



ArnpMtornus McNeill. 

 k ^. Lateral carinae of the pronotum pres- 

 ent; median carina not accompanied by 

 supplementary carinae on the disk. 



Acentetus McNeill. 

 j ^ Color plain ; scapular area of the tegmina 

 not broader than the mediastinal area. 



Arahlytropidla Stal. 

 % ^. Median carina of the pronotum cut much 

 behind the middle by the principal sulcus. 



Chloealtis Harris. 

 f^. Scutellum of the vertex with no distinct median 

 carina. 



g^. Median carina of the pronotum cut much 

 behind the middle by the principal sulcus. 



h^. 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. . Dichroniorpha Morse. 



h"^. 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. . . Clinocephalus Morse. 

 g"^. Median carina cut near the middle by the 

 principal sulcus. 



