JAMES A. G. REHN AND MORGAN HEBARD 235 



regularly arcuate transversely: greatest caudal width of pronotal disk con- 

 tained one and two-fifths in greatest length of same: all margins of pronotum 

 cingulate, cephalic margin of disk weakly concave mesad; caudal margin of 

 disk weakly arcuate. Lateral lobes of pronotum with greatest dorsal length 

 contained one and two-fifths in greatest dorsal length of same: cephalic mar- 

 gin of lateral lobes oblique sinuato-truncate; ventro-cephalic angle rounded 

 obtuse; ventral margin weakly oblique, ventro-caudal angle (which is the 

 point of greatest depth) broadly rounded obtuse; caudal margin obliquely 

 sinuato-arcuate, indications of humeral sinus and a similar sinuation ventrad 

 on the same margin, weak; surface of the lobes weakly impressed dorso-caudad. 



Tegmina in length equal to length of head and twice that of the pronotum 

 together, reaching to the base of the fifth abdominal tergite, of the tegminal 

 length that of the stridulating field occupies half, the proximal half of the 

 tegmina broad, the distal half narrowing apprecial)ly to the apex: costal margin 

 strongly arcuate proximad, very faintly arcuate mesad, distad moderately 

 straight oblique to the bluntly rounded apex; sutm-al margin straight distad 

 of the stridulating field: mediastine vein distinct but short, sinuate; humeral 

 and discoidal veins fused into a very robust humeral trunk, this distinctly 

 arcuate in proximal half, as slender as and sul:)parallel to the median vein 

 distad; median vein nearly straight, bent slightly before its middle, attenu- 

 ate; ulnar vein furcate at proximal two-fifths of its length, the costal fork 

 closely approaching the median vein: stridulating field of left tegmen with 

 greatest width contained about one and one-half times in the greatest length 

 of the same, bounded laterad by a very broad external speculum or channel, 

 in which is faintly indicated the anal vein; stridulating vein transverse, arcuate 

 proximad, straight distad, very robust in distal two-thirds, in transverse sec- 

 tion rounded dorsad; speculum with greatest length and greatest proximal 

 width subequal: speculum of right tegmen subcircular in outline, transparent: 

 general anastomosing venation well elevated. 



Wings but very faintly shorter than the tegmina, when expanded the 

 length along the costal margin is distinctly less than length along the radiate 

 margin, periphery of the radiate field arcuate in a quadrant, weakly sinuate 

 distad, apex of the anterior field bluntly rounded. 



Prosternum with the paired spines very elongate, acute, erect; mesosternum 

 with the sternal lobes erect spiniform, these productions hardly shorter than 

 the prosternal spines. 



Penultimate abdominal tergite short, transverse, distal margin arcuate 

 obtuse-angulate distad, over cereal bases produced into broadly arcuate lobes, 

 the surface of the tergite at the depth of the median emargination trans- 

 versely arcuate impressed, this flanked laterad by paired low, but erect, 

 subtrigonal tooth-like projections: antepenultimate tergite smooth. Supra- 

 anal plate small, trigonal, dorsal surface excavate. Cerci relatively short, 

 broad in proximal half, there with surface subdeplanate, along internal mar- 

 gin with an elevated ridge, which becomes more pronounced mesad, then 

 disappears; the internal tooth is situated mesad, deflected and decurvetl; 

 distal half falciform and tapering, narrowing sharply distad of tooth and thence 



TRANS. AM. ENT. SOC, XLVI. 



