ACRIDIIDAE — ACRIDIINAE 3 9 



ACEIDIINAE. 



This subfamily is richly represented in the United States, as 

 compared for instance with Europe, but poorly endowed as com- 

 pared with other parts of the world. The groups found with us 

 appear in the following table : — 



Groups of Acrid iinae. 



A ^ Hind tibiae furnished above with an apical spine on both 

 sides. 



b^. Hind tibiae armed with strong spines, those on the inner 

 margin much longer than those on the outer. Tropidonoti. 



h\ Hind tibiae armed with moderate spines, of similar length 

 on the inner and outer margins. 



c ^ Fastigium of vertex subtriangularly acuminate ; frontal 

 costa compressed. 



d ^. Pronotum tectiform, the front margin subtriangularly 

 produced, the median carina elevated throughout. 



Taeyiiopodae. 

 d". Pronotum plane above, the front margin truncate or 

 emarginate, the median carina lacking on the prozona, but 

 little elevated on the metazona. . . JRhomaleae. 

 c ^. Fastigium of vertex obtuse ; frontal costa neither com- 

 pressed nor sulcate. .... Tropidacres. 



A^. Hind tibiae with no apical spine on the outer side. 



b ^. Face very oblique ; fastigium of vertex prominent, more or 

 less acuminate. 



c^. Hind tibiae not expanded apically, the outer margins 

 rounded. ....... Mesopes. 



c'^. Hind tibiae expanded apically, the outer margins acute. 



Leptysmae. 

 b '^. Face nearly vertical ; fastigium of vertex not prolonged, 

 apically obtuse. 



c^. Mesosternal lobes longer than broad, the inner margin 

 straight. ....... Acridia. 



c 2. Mesosternal lobes transverse or equally long and broad, 

 the inner margin usually rounded. 



