142 PBOrEEDINGS OF THE NATIONAL MrSET3f. vol.xxxvi. 



One of the female individuals is quite large, considerably exceed- 

 ing the other female and the original measurements in size. There 

 appears to be considerable variation in the depths of the coloring of 

 the dark lateral bars, one specimen from Conmiba having them quite 

 faintly indicatexl. 



Genus MASTUSIA Stal. 



1878. Mastusia StAl, Bih. till Kong. Svenska Vet. Akad. Ilandl., V, No. 4, pp. 39 

 and 84. 



Type. — Mastusia quadricarinata Stal. 



MASTUSIA KOEBELEI, new species. 



Types. — Male and female. Bonito, Pernambuco, Brazil. January 

 18, 1883 (male); February, 1883 (female). (A. Koebele.) Cat. No. 

 12091, U.S.N.M. 



Differing from. Mastusia quadricarinata from Peru in the much 

 smaller size, shorter and narrower tegmina and different coloration. 



Bolivar's M. spectahilis " from the Upper Amazon region is not 

 closely related to the new form. 



Size small; face and surface of the thoracic segments punctate, 

 the pronotum strongly so. Head with its exposed dorsal surface 

 two-thirds (female) to four-fifths (male) the length of the pronotum; 

 occiput slightly ascending very slightly arcuate; interocular space 

 about one-half (male) to three-fifths (female) the greatest width of 

 the fastigium; fastigium broad, very short, horizontal, the angle 

 obtuse-angulate in both sexes, more decidedly so in the female than 

 in the male; surface very slightly depressed within the margins; 

 fastigio-facial angle acute-angulate, the immediate angle well rounded, 

 facial line very decidedly retreating; frontal costa broad, sube({ual, 

 but very slightly expanded between the antennae, narrowed dorsad 

 of the anti?nn{e to joint the fastigium, a slight constriction present at 

 the ocellus, margins distinctly elevated, surface moderately exca- 

 vate and distinctly punctate; supplementary facial carinse promi- 

 nent, regularly and decidedly divergent caudad; eyes moderately 

 prominent in both sexes, acute-ovate in outline, the length about 

 half that of the infra-ocular portion of the genae; antennae slightly 

 shorter than the head and pronotum together (male) or no longer 

 than the pronotum (female), slightly depressed, very slightly nar- 

 rowed toward the base. Pronotum with the greatest caudal width 

 of the disk contained approximately one and one-half times in the 

 length of the same; cephalic margin slightly arcuate (male) or 

 arcuato-truncate (female), caudal margin distinctly emarginate 

 mesad, the sides of the emargination convex, lateral angles very 

 well rounded; median carina distinct, but very low, principal trans- 

 verse sulcus the only one severing the carina, metazona about a 



«Anal. See. Esp. Hist. Nat., XIX, p. 325. 



