1918.] NATURAL SCIENCES OF PHILADELPHIA. 181 



very slightly less than the greatest dorsal length : cephalic margin of 

 clisk obtusely produced with a very broad, shallow emargination : 

 caudal margin of disk very broadly obtuse-angulate : median carina 

 faintly indicated cephalad, more distinctly so on the metazona, obso- 

 lete mesad: transverse sulci well impressed, metazona slightly more 

 than one-half of the prozonal length : lateral lobes with the greatest 

 dorsal length subequal to the greatest depth; cephalic margin of 

 lobes straight, slightly oblique, ventro-cephalic angle nearly rectangu- 

 late, ventral margin obliquely concave-emarginate cephalad, median 

 angle distinct but obtuse, this margin obliquely subarcuate caudad, 

 ventro-caudal angle obtuse, caudal margin straight, vertical. Teg- 

 mina reaching to the apex of the supra-anal plate, moderately broad, 

 distal four-fifths weakly tapering, apex rounded; venation close, 

 particularly proximad. Wings reaching to the tips of the tegmina, 

 very broad, the greatest width contained one and two-fifths times in 

 the greatest length: distal section of anterior and portion of radiate 

 fields subtruncate. Prosternal spine very robust, short, rather 

 bltmt, faintly transverse compressed: interspace between the meso- 

 sternal lobes with cephalic width faintly greater than the depth, the 

 caudal width very much greater, the interspace regularly narrowing 

 cephalad, median width of interspace very faintly less than that of 

 one of .the lobes, ventro-internal angle of the lobes broadly obtuse : 

 metasternal lobes touching caudad. Supra-anal plate with the 

 greatest proximal width subequal to the greatest length, lateral 

 margin suljparallel proximad, then moderately and regularly narrow- 

 ing, distal extremity rather broad, arcuato-truncate, the surface with 

 a pair of shining black tubercles placed mesad at the distal third, 

 proximad the same plate has indications of a medio-longituclinal im- 

 pression, flanked laterad by a pair of low rounded ridges; margins 

 slightly thickened and elevated: cerci robust, flattened and broad 

 proximad, in general form subfalcate, the tip directed dorsad, strongly 

 tapering from the broad base to the median section, thence weakly 

 tapering to the subacute apex; when viewed from the dorsum the 

 general form of the cercus is straight proximad, then incurved and 

 last with the chstal fourth straight, the arcuate distal margin of the 

 broad proximal portion bears several blunt teeth: pallium^^ greatly 

 produced in an erect, distad compressed, falciform process consider- 

 ably surpassing the subgenital plate, in form this process is gently 

 tapering with a moderately acute apex: subgenital plate short, well 



31 See Scudder, Proc. U. S. Nat. Mus., XX, p. 8, (1897). 



