JAMES A. G. REHN 339 



than the greatest depth of the same; cepliaHc margin of lobes sinuato-suh- 

 truncate, ventro-cephaUc angle obtuse, narrowly rounded, ventral margin 

 obtuse-angulate, cephalic section weakly concave, ventro-caudal angle rounded 

 obtuse, caudal margin oblique subtruncate. Tegmina projecting distad of the 

 apices of the caudal femora a distance equal to two-thirds of the length of the 

 pronotum; apex rounded subangulate; venation coarse, subelevated. Wings 

 reaching to tegminal apices. Prostcrnal spine erect, conical, acute: interspace 

 between the mesosternal lobes longitudinal, its least width equal to twice the 

 length of the same, broadening caudad, meso-caudal angles of the lobes rounded 

 rectangulate: metasternal lobes narrowly attingent. 



Furcula very brief, subattingent, faintly divergent, narrow, rounded fingers: 

 supra-anal plate short linguiform, lateral margins in general arcuate con- 

 vergent to the obtusely rounded apex, the margin slightly indented at the 

 proximal fourth; surface of the plate with a median, deeply excavate area on 

 proximal half, this narrowing distad and with distinct subelevated margins, 

 distal half of median section of surface of plate weakly elevated and with 

 slight, lateral, parallel shoulders, extensive lateral sections of the surface of the 

 plate distinctly concave: cerci extending caudad to the apex of the supra-anal 

 plate, in general form substyliform, tapering from a relatively broad base to a 

 slender distal section, which is approximately one-third as deep as the base of 

 the cercus, and very faintly spatulate, the apex very bluntly rounded; when 

 seen from the dorsum the cerci are regularly inbowed and as a pair forcipate: 

 subgenital plate greatly produced, weakly impressed, attenuate when seen from 

 the dorsum, faintly bulbose and rounded at apex, when seen from the side 

 the margin of the plate is very weakly arcuate, the a{)ex distinctly shallower 

 than the base: pallium weakly erected. 



Cephalic and median limbs with femora moderately inflated, tibiae propor- 

 tionately slender. Caudal femora relatively slender, narrowing distad, the 

 greatest depth contained three and one-half times in the greatest length of the 

 same, usual bullation of the proximal portion not strongly indicated, subcom- 

 pressed, pagina deeply engraved: caudal tibiae slightly shorter than the femora, 

 armed on external margin with nine spines, on internal margin with ten to 

 twelve spines. 



Allotype. — 9; Misiones, Argentina. December, 1910. (P. 

 Jorgensen.) [Academy of Natural Sciences of Philadelphia.] 



Differing from the above description of the type in the following details. 

 Size rather above average: form relatively robust. 



Occiput, interocular space and fastigium less strongly arcuate, the latter 

 evenly and not strongly arcuate declivent; interocular width faintly greater 

 than the interantennal width of the frontal costa: fastigium with its greatest 

 width subequal to its greatest length, hardly excavate; facial line less decidedly 

 retreating and more vertical, the fastigio-facial angle projecting cephahul of 

 eye a distance equal to more than one-half the width of the eye: frontal costa 

 regularly and faintly narrowing dorsad in dorsal section, otherwi.se as in male, 

 the sulcation less extensive and decided: sui)plementary facial carinae more 

 distinctly diverging ventrad than in the male: eyes little prominent when 



TRANS. AM. ENT. SOC, XLIV. 



