l8o DAVENPORT ACADEMY OF NATURAL SCIENCES. 



and though they present on the whole a very different appearance and, 

 in fact, are different in a large number of characters from GEdipodmrn, 

 the connecting links between them are so numerous that it is difficult 

 to find any clearly definable characters which will serve to separate 

 these sub-families. 



KEY TO THE AMERICAN SUB-FAMILIES OF ACRIDID^. 



A.^ Tarsi not furnished with a pulvillus. Pronotum extending to or 

 beyond the end of the abdomen ... i. — Tettigince. 



A.* Tarsi furnished very generally with a pulvillus. Pronotum much 

 exceeded by the abdomen. 



B.^ Antennce shorter than the anterior femora 2. — Proscopitiiz. 



B.2 Antennae longer than the anterior femora. 



C' Prosternum unarmed or, if furnished with a more or less distinct 

 tubercle or spine, the lateral carinae of the pronotum or the lateral 

 foveol^e of the vertex are present and well developed. 



D' Vertex of the head generally horizontal or a little ascending. 

 Viewed from the side, the vertex forms an angle, more or less 

 rounded, with the front, which is very generally moderately or 

 strongly oblique. In no case is the median carina of the prono- 

 tum crested or cut by more than one sulcus and the posterior mar- 

 gin of the metazone is never sharply angulate. . . .3. — Truxalince. 



D.- Vertex of the head very generally declivent. Viewed from the 

 side, the vertex is nearly always roundly and not angulately united 

 with the front, which is sub-perpendicular, rarely decidedly 

 oblique. In the rare cases where the head is truxaline, the pro- 

 notum and the tegmina are strongly oedipodine, i. e., the lateral 

 carinte are obsolete, the median carina is cut by more than one 

 incision or is crested, or the metazone is sharply angulate and the 



tegminae are everywhere densely and regularly reticulate 



4. — (Edipodince. 



C.^ Prosternum armed with a tubercle or spine. 



D.' Front very oblique. Lateral foveolae meeting in the median line 



so as to form the anterior part of the roof of the vertex 



5 . — Pyrgotnorphince. 



D.2 Front rarely very oblique, frequently sub-perpendicular. Lateral 

 foveolae, if present, never meeting nor forming a part of the roof 

 of the vertex 6. — Acridince. 



