20 OBTHOPTERA. 



c. Fastigium of the vertex horizontally produced or but slightly 

 elevated, emarginate. Pronotum truncate or cmarginate 



behind [Teicophrys, Bruner.] 



AA. Frontal costa percurrent, very narrow between the antennae, deeply 



sulcate throughout. 



b. Basal joint of hind tarsi above with both margins spined or serrate. 



Body apterous. 



c. Sulcation of the vertex not separated from that of the frontal 



costa by a transverse ridge. Valves of the ovipositor blunt, 



unequal in length, and without teeth or serrations .... Gymnotettix, Bruner. 

 cc. Sulcation of the vertex separated from that of the frontal costa 

 by a transverse ridge. Valves of the ovipositor acute at tip, 



strongly serrated E pis actus, Brunner. 



bb. Basal joint of the hind tarsi above with both margins smooth or 

 at most provided with stiff hairs. 

 c. Legs long, the spines on the inner side of hind tibipe alternately 

 large and small. Tegmina and wings well developed or rudi- 

 mentary. 

 d. Vertex rather narrow, neither compressed nor projecting in 

 front of the eyes. Tegmina and wings present. 

 e. Tegmina hyaline, regularly veined; wings hyaline, not 



coloured . Eumastax, Burr. 



ee. Tegmina opaque, coloured, densely or irregularly veined; 



wings coloured Paramastax, Burr. 



dd. Vertex moderately broad, horizontal, and projecting in front 



of the eyes. Tegmina and wings rudimentary [Masyntes, Karsch.] 



cc. Legs shorter, the spines on the inner side of hind tibiae of uniform 



size. Tegmina and wings absent or rudimentary [Morsea, Scudder.] 



[TEICOPHRYS, gen. nov. 



Body of moderate size, rather slender, and apterous ; the pronotum short and inconspicuous, scarcely longer 

 than either the meso- or metathoracic segments separately, and with a small median carina, the hind and 

 front edges above truncate, slightly notched in the middle. Head short, the eyes only a trifle prominent, 

 about as long as the cheeks below them ; vertex gently ascending, bordered by well-defined lateral ridges 

 which terminate in anteriorly projecting blunt points that reach beyond 

 the front edges of the eyes, these points forming also the upper termini 

 of the lateral walls of the frontal costa. There is also on each side at 

 the back edge of the fastigium of the vertex a prominent tubercle, which 

 marks the beginning of the carinae just referred to. The flattened 

 frontal costa of the face, which is continuous with the fastigium of the 

 vertex, is bordered by rather prominent carinae that diverge greatly 

 to a point midway between the top and bottom of the eyes aud then 

 suddenly converge, so as to leave the costa only about one-half or a trifle 

 more of its greatest width, from where they continue down the face 

 parallel or nearly so to just below the ocellus, when they again bend 



abruptly inward and unite, forming a single ridge down the middle of the face almost to the clypeus, 

 where it branches, sending out and downward on each side obliquely a carina that reaches and unites 



