JAMES A. G. REHN AND MORGAN HEBARD 241 



inargiin sinuate oblique, the sinuatiou ventral; surface of the lobes distinctly 

 impressed in the usual position of the humeral sinus. 



Tegmina in length sul^equal to that of the head and pronotum, of the total 

 tegminal length the stridulating field occupies more than three-fourths, apex 

 of tegmina not surpassing the fourth abdominal tergite: costal margin briefly 

 arcuate proximad, broadly arcuate distad, the portion mesad straight; apex 

 subrectangulate; sutural margin strongly sinuato-arcuate about inflated 

 stridulating area, distad very briefly arcuato-emarginate: mediastine vein 

 weak and irregular; humeral and discoidal veins fused into a very robust 

 humeral trunk, this arcuate in proximal two-thirds; median vein nearly 

 straight, well sejiarated from the humeral trunk in the arcuate section of the 

 latter, fusing with this at distal third; ulnar vein furcate at distal three-fifths 

 of length: stridulating field of left tegmen about one and one-third times as 

 long as broatl, bounded laterad by the very broad membranous channel or 

 external speculum, the depth of which is traversed longitudinally by the 

 weakly defined anal vein; stridulating vein straight, transverse, very robust, 

 triangular in section; speculum with greatest length slightly greater than 

 proximal width of same: speculum of right tegmen larger than that of left 

 tegmen, with general form more circular. Wings falling slightly short of the 

 tegminal apices, rounded, folded fan-wise. 



Prosternum with a pair of very elongate spines; mesosternum and meta- 

 sternum with the sternal lobes developed into pronounced spiniform pro- 

 ductions as long as the prosternal spines, those of the mesosternum more 

 acute than those of the metasterninn. 



Penultimate abdominal tergite very short; distal margin mesad o))tuse- 

 angulate emarginate, produced laterad of this into rectangulate projections, 

 a distinct sulcus extending eephalad from the bottom of emargination. this 

 and the internal margin of the triangular projections appreciably thickened 

 and subcingulate; antepenultimate tergite with a medio-longitudinal lamel- 

 late carination; supra-anal plate small, trigonal, dorsal surface excavate. 

 Cerci broad at base, relatively elongate and forcipate distad, tapering from 

 proximal sixth, where the accessory tooth, found in the species of this genus, 

 is situated, being developed as a decurved claw; median third of cercus nearly 

 straight; distal third of cercus moderately incurved, the apex acute and 

 weakly recurved: dorsal surface of proximal third of cerci impressed mesad, 

 the internal margin elevated and thickened, the impression and the external 

 section papillose. Subgenital plate elongate, the distal margin obtuse-angu- 

 late emarginate; styles relatively short and thick; styliferous pillar-like ridges 

 decided, a medio-longitudinal carination i)ronounced. 



Femora with all ventral margins supplied with series of numerous small 

 spines; genicular lobes bispinose, the spines of the caudal lobe of the cephalic 

 femora very short. Cephalic femora longer than combined length of the 

 head and pronotum; spines of ventro-cephalic margin appreciably longer than 

 those of the ventro-caudal margin: cephahc tibiae with foramina rimate, 

 the spines of ventral margins hexacentroitl in character, six in numl)ei- on 



TRANS. AM. ENT. SOC, XLVI. 



