ACRIDIIDAE ACRIDIINAE 39 



ACKIDIINAE. 



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 Acridiinae. 



A 1 . Hind tibiae furnished above with an apical spine on both 

 sides. 



b 1 . Hind tibiae armed with strong spines, those on the inner 

 margin much longer than those on the outer. Tropidonoti. 

 b*. Hind tibiae armed with moderate spines, of similar length 

 on the inner and outer margins. 



c 1 . Fastigium of vertex subtriangularly acuminate ; frontal 

 costa compressed. 



d 1 . Pronotum tectif orm, the front margin subtriangularly 

 produced, the median carina elevated throughout. 



Taeniopodae. 



d' 2 . Pronotum plane above, the front margin truncate or 

 emarginate, the median carina lacking on the prozona, but 

 little elevated on the metazona. . . JRhomaleae. 

 c ' 2 . Fastigium of vertex obtuse ; frontal costa neither com- 

 pressed nor sulcate. .... Tropidacres. 



A 2 . Hind tibiae with no apical spine on the outer side. 



b l . Face very oblique ; f astigium of vertex prominent, more or 

 less acuminate. 



c 1 . Hind tibiae not expanded apically, the outer margins 

 rounded. ....... Mesopes. 



c 2 . Hind tibiae expanded apically, the outer margins acute. 



Leptysmae. 



b' 2 . Face nearly vertical; f astigium of vertex not prolonged, 

 apically obtuse. 



c 1 . 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. 



