1920.] NATURAL SCIENCES OF PHILADELPHIA. 287 



the distal margin, which latter is truncate, the flexor margin straight, 

 rouncUng into the distal margin, the extensor margin moderately 

 but distinctly concave: antennae incomplete. 



Pronotum transverse, the greatest median length contained nearly 

 one and a half times in the greatest caudal width of the pronotum; 

 in transverse section the dorsum of the pronotum is rather strongly 

 arcuate, well rounding into the lateral lobes: cephalic margin of 

 dorsum emarginato-truncate ; caudal margin bisinuate laterad, ro- 

 tundato-angulate mesad; lateral borders of the disk weakly diverg- 

 ing caudad, all pronotal margins excepting the usual lamellato- 

 cingulate portion ventro-caudad on the lateral lobes, narrowly 

 cingulate: medio-longitudinal line weakly impressed; pyriform im- 

 pressions transverse, elongate: lateral lobes longitudinal, their 

 depth contained nearly twice in their length, moderately impressed 

 ventro-caudad; ventro-cephalic angle and ventral margin arcuate, 

 ventro-caudal angle rounded obtuse. 



Tegmina very slightly surpassing the tips of the caudal femora, 

 relatively narrow, the lateral borders of the dorsal field subparallel 

 proximad, faintly arcuate convergent distad: lateral field rather 

 narrow, subequal in width in the proximal third, very gradually 

 narrowing thence to the distal fourth, from which point distad it 

 more sharply narrows; mediastine vein with four to five rami and 

 the field with five free veins proximad; dorsal field with its greatest 

 width contained about five times in the greatest tegminal length; 

 ulnar vein strongly sinuate at about its middle; anal vein with a 

 faint sinuation slightlj^ proximad of its middle; axillary veins (two) 

 simple; median vein with four oblique rami distad, which are not 

 strongly marked, yet form with the ulnar and anal veins the usually 

 distinct pattern of oblique "sectors" found in most of the species 

 of the genus; longitudinal sinuate intercalated nervures and short 

 cross-veins evident. Closed wings extending distad of the teg- 

 mina a distance equal to about one and one-third times the length 

 of the pronotum. 



Limbs moderately robust, the cephalic and median femora quite 

 deep, moderately compressed. Cephalic tibiae with a small elliptical 

 foramen on the cephalic face, the caudal face imperforate. Caudal 

 femoi-a one and two-fifths times as long as the tegmina, regularly nar- 

 rowing distad: caudal tibiae subequal to the femora in length; dorso- 

 external margin armed with five major spines, the dorso-internal 

 with six, the dorso-external margin with 3-2-2-1 intercalated spinu- 

 lations, the internal with 2-2-1-2-0; external distal spurs very 



