244 NORTH AMERICAN EUMASTACINAE (oRTHOPTERA) 



gin weakly bisinuate with a broad, shallow, median emargination ; caudal 

 width of the entire pronotum slightly greater than the length of the same: 

 lateral lobes of the pronotum with their greatest depth equal to about two- 

 thirds of their dorsal length, dorsal half of the lobes with a group of numerous 

 small strumosities, the ventro-caudal section of the lobes flaring laterad, the 

 ventro-cephahc section sUghtly curved ventro-mesad; cephahc margin of the 

 lobes regularly arcuate to the ventro-cephaUc angle, which is broadly rounded 

 and passes into the truncate ventral margin, ventro-caudal angle rounded 

 rectangulate, caudal margin subtruncate. Tegmina and wings absent. Meso- 

 notum reproducing the structure of the caudal section of the pronotum; meta- 

 notum more similar to the abdominal segments in structure, the caudal margin 

 more nearly truncate, median carinulation evident. 



Abdomen with the median carinulation continuous to the disto-dorsal ab- 

 dominal segment, on which it is not evident: disto-dorsal abdominal segment 

 with its distal margin faintly arcuate mesad, arcuate-emarginate about the 

 cereal bases: cerci relatively short, not quite reaching the extremity of the 

 subgenital plate, simple, tapering styUform, faintly incurved, apex blunted: 

 supra-anal plate trigonal, with a median carination: subgenital plate or rather 

 segment apparently composed of a pair of lateral plates with the section be- 

 tween made up of soft integument, the plates elongate trigonal in form, the 

 apices, which are dorsal, acute, the whole plate when seen from the caudal as- 

 pect in section regularly arcuate toward the median Une, the tips of the two 

 plates or sections attingent; the integument median and ventro-caudal in posi- 

 tion, its general outline subtrigonal when seen from the caudal aspect; when 

 seen from the lateral aspect the subgenital plate or segment is distinctly deeper 

 than long, when seen from the caudal aspect with the width is faintly greater 

 than the depth. Interspace between the mesosternal lobes strongly trans- 

 verse, approximately twice as mde as one of the lobes, the cephalic margin of 

 the interspace very broadly obtuse-angulate emarginate, the internal margins 

 of the lobes sMghtly obUque, the interspace broadening caudad, the interno- 

 caudal angle of the lobes nearly rectangulate : metasternal lobes contiguous, the 

 caudal margin of the meso-met asternal plate broadly obtuse-angulate emar- 

 ginate. 



CephaUc and median limbs slender. Caudal femora moderately elongate, 

 slender, in length subequal to that of the thorax and abdomen combined, 

 tapering, weakly compressed, median dorsal carina minutely serrulate; pagina 

 flattened, pattern distinct but slightly irregular; margin of the genicular 

 extremity with median and lateral spiniform projections, genicular lobes 

 acute: caudal tibiae very faintly longer than the femora, weakly sinuate; 

 spines not regularly biseriate in length, decreasing in length proximad, external 

 margin with fifteen spines, internal margin with thirteen to fourteen spines, 

 of which the distal one is shorter than the others and rather removed from the 

 series, being placed on the distal lamellation of that margin: tibial spurs of the 

 external face short, the dorsal one about twice as long as the ventral one, the 

 former about equal to the distal tibial depth, spurs of the internal face unequal 

 in length, the dorsal one nearl}- three times the length of the ventral one, the 

 length equal to about two-fifths that of the caudal metatarsus, the distal por- 



