ORTHOPTERA. 



AA. Anterior femora sulcate above BATRACHIDEiE. 



G. Sides of vertex terminating anteriorly in distinct, oblique, 

 transverse, subhorizontal carinse. 



H. Facial costa sinuous in profile. Elytra minute, elongate. 



Posterior sinus of lateral lobes barely indicated .... 



HH. Facial costa convex in profile. Elytra ovate, of normal 



size. Posterior sinus normal Tettigidea, Scudd. 



GG. Sides of vertex convex, transverse carinse obsolete Scaria, Bol. 



Plectronotus, gen. nov. 



Group CLADONOT-ffi. 



TYLOTETTIX, gen. nov. 



Related to Diotarus, but having the face retreating, the facial scutellum deeply concave, with high marginal 

 carinas; the vertex strongly convex in front, with a very prominent mid-carina ; the anterior margin of 

 the pronotum truncate ; the genicular and femoral lobes of the hind femora prominent. The type is 

 T. sinuatus, described below. 



1. Tylotettix sinuatus, sp. n. 



Crimisus sp., Bruner, Bull. Lab. Nat. Hist. Univ. Iowa, iii. no. 3, p. 61, t. 3. fig. 1 \ 



Face retreating, with prominent carinas ; in profile, slightly excavated at the lower edge of the scutellum, 



deeply (almost rectangularly) so at its upper margin, where the carinse unite to form the very prominent 



mid-vertical carina, which is continued backward to a point just behind the level of the front margin of 



the eyes. Seen from above, the vertex is twice the width of one of the 



eyes, the mid-carina projects in front of the eyes nearly the width of one 



of them, and on each side of this the front margin of the vertex is formtd 



by a short transverse carina projecting convexly between the mid-carina 



and the eyes, but reaching neither. Pronotum rather sharply tectiform, the 



mid-carina cristate, arched anteriorly, nearly straight posteriorly; front 



margin truncate ; hind process abbreviated, not reaching the apex of the 



hind femora, with rounded, subemarginate tip ; lateral carinas bent inward, 



elevated and compressed behind the humeral angles, sinuate in both dorsal 



and lateral views ; hind process with oblique elevated ruga?, three or four 



on each side, running inward and forward from the humero-apical carinas 



nearly to the mid-carina ; scapular area, wings, and elytra absent. Fore 



and mid-femora stout, two and one-half times as long as wide, strongly 



carinate, lobate beneath with strongly sinuate margins ; hind femora stout, genicular and femoral lobes 



prominent. 

 Total length, d, 8*7: pronotum 7"7; post. fern. 5*25; antennas 2-3 millim. 



Hal. Nicaragua (Shimek, in coll. Bruner 1 ). 

 One male, from " a swampy locality." 



Group METRODOKJE. 



CHIRIQUIA, gen. nov. 



Related to Pterotettix, especially in the form of the elytra, but differing from that genus in having the posterior 

 ocelli below the level of the eyes and also in the structure of the vertex. 



