JAMES A. C4. REHN AND MORGAN HEBARD 227 



oaudad, joining the caudal margin of the disk briefly caiidad of the point 

 of greatest width of disk; surface of lobes rugulose, the cephahc transverse 

 sulcus deeply impressed dorsad, caudal transverse sulcus evident though less 

 deeply impressed than the cephalic transverse sulcus; ventral margin dis- 

 tinctly and heavily cingulate. Tegmina in normal position completely 

 hidden under the pronotum, of the type usual in the genus, their greatest 

 width faintly greater than their greatest length; sutural margin with the 

 projection at the apex of the sutural vein narrowly rounded rectangulate 

 produced;' humeral trunk very robust, strongly and regularly arcuate; stridu- 

 lating vein straight transverse in the distal two-thirds, distinctly thickened 

 near apex. Prosternum unspincd. Mesostermun and mctasternum strongly 

 transverse, the lateral lobes hardly produced, broadly rounded; foi'aminal 

 fossae strongly transverse, rimate. 



Abdomen with a very weak medio-longitudinal carination of the dorsal 

 tergites. Supra-anal plate, which is apparently the eleventh tergite and 

 is fused with the tenth tergite proximad, lies between the dorsal ridges of the 

 inter-cercal plates, the lateral margins of the plate weakly converging, nearly 

 straight, distal margin broadly arcuate. Inter-cercal plates' strongly devel- 

 oped, weakly arcuate in most of their length, moderately falcate distad; the 

 internal tooth apical, weakly unguiculate; dorso-internal surface of plates 

 concavo-excavate, the dorsal carina sharp. Cerci equal to about one-third 

 the length of the inter-cercal plates, elongate conical, proximal width equal 

 to about one-half of length, distal extremity faintly attenuate. Sul)genital 

 plate large, scoop-shaped, subparallel laterad, distal extremity reaching to 

 apices of inter-cercal plates, portion of distal margin between styles bisarcu- 

 ate, styles represented by small semicircular rudiments. 



Cephalic and median femora relatively short, moderately rol)Ust, faintly 

 compressed, dorsal surface with a few adpressed spines i)roximad; ventral 

 margins unspined, except that ventro-cephalic margin of one cephalic femur 

 bears mesad a single spine. Cephalic; tibiae with foramina rimate; dorsal 

 margins unarmed except for a single distal spine on the cephalic margin; 

 ventral margins with five to six spines. Median tiljiae with three to four 

 spines on the dorsal margins; ventral margins with five to seven spines. 

 Caudal femora somewhat longer than the length of the head and pronotum 

 together, moderately inflated proximad, dorsal surface of inflated section with 

 numerous adpressed spines; ventro-external margin with three to six spines, 

 ventro-internal margin with three to four spines: caudal tibiae no longer than 

 the femora, ventral margins unarmed except for a few very small spines 

 distad; distal spurs a single pair, the internal one apprecial)ly longer than the 

 external one: caudal tarsi short; plantula short, ovate in outline, the internal 

 one the longer, this no more than one-half as long as the metatarsus. 



General coloration chamois, faintly tinted with lime green on he pro- 

 notum (in life :UI mottled gr(>cn), the dorsal abdominal pattern, which is a 

 featiue of Aijlaotlioi-ax and Nnluha, snuff brown, tlu> pale blotches of the 



3 The "infra-cereal plates" of Caudell's paper on the NoiUi .Xmerican 

 Decticinae. 



TRANS. .4M. ENT. SOC, XLVI. 



