NO. 1661. ON SOME BRAZILIAN GRASSHOPPERS— REHN. 



143 



third tJie length of tho prozona; lateral lobes slightly longer than 

 deep, ventral margin slightly but distinctly arciiate-emarginate 

 cephalad, the caudal section of the margin very bluntly obtuse- 

 angulate, the ventro-caudal angle rounded. Tegmina extending 

 slightl}' caudad of the margin of the metanotum, sub-lanceolate, 

 the greatest width contained approximately three to four times in 

 the length, apex moderately angulate. Wings ver}' 

 minute, loliiform, covered by the tegmina. Abdomen 

 distinctly compressed, tectate dorsad; supra-anal 

 plate short, transverse, the apical margin rectangu- 

 late, disk considerably excavate; cerci moderately 

 long, with a considerable arcuation dorsad before 

 the middle, the apex blunt, with a sharply bent spine 

 directed ventro-cephalad toward the median line; 

 subgenital plate elevated and j^roduced distad, 

 strongly compressed and sub-lamellate in that por- 

 tion, the apex when seen from the side well rounded. 

 Prosternal process transverse, the apical margin rec- 

 tangulate, the angles slightly spiniform; interspace 

 between the mesosternal lobes distinctly longitudinal, 

 about twice as long as wide, with the interspace about 

 two-thirds the width of one of the lobes (male) or 

 wedge shaped with the narrowest (caudal) portion of 

 the interspace slightly less than half the length of the 

 same (female) ; metasternal lobes contiguous in both 

 sexes. Cephalic and median limbs very short, rather 

 slender in the female. Caudal femora reaching to (female) or exceed- 

 ing (male) the apex of the abdomen, moderatelv robust, tapering, 

 genicular lobes bluntly angulate, pagina regularly and rather closely 

 patterned; caudal tibiae distinctly shorter than the femora, slightly 

 dilated distad, the margins distinctly lamellate in that portion, lateral 

 margin with seven to eight spines, internal margin with ten to eleven 

 spines; caudal tarsi with the proximal joint mod- 

 erately depressed and dilated. 



General color russet, abroad postocular bar ex- 

 tending over the dorsal half of the lateral lobes, 

 the ventral half of the tegmina ami dorsal portion 

 of the pleura Vandyke brown, continued on the 

 sides of the abdomen as a series of blotches of the 

 same color in the female, as a bar in the male, 

 becoming weaker distad in both sexes; ventral half of the lateral lobes, 

 genj© and pleura wood brown; face with a pair of more (male) or less 

 (female) divergent dark lines ventradof the insertion of the antennae; 

 occiput with a dark brown median bar in the male; caudal tibiae 

 Vandyke brown distad, spines pale yellow, tipped with blackish. 



Fig. 26. — Mastusia 

 koebelei. doesal 

 view of female 

 TVi-E. (x:^) 



Fig. 27.— Mastusia koe- 

 BELEi. Lateral out- 

 line of HEAD and pro- 



NOTUM of female TYPE. 

 (X3) 



