232 BRAZILIAN ORTHOPTERA 



Dendroblatta sobrina new species (Plate XIV, figs. 11, 12, 13 and 14.) 



Type. — d' ; Porto Velho, Rio Madeira, Brazil. (Stanford 

 Expedition; Mann and Baker.) [Acad. Nat. Sci. Phila., Type 

 no. 5245.] 



Size medium; form deplanate; surface moderately polished. Head strongly 

 deplanate, in general outline trigonal, the eyes rounded, the lateral margins of 

 the head converging ventrad as far as the bases of the mandibles; occipital 

 outline arcuato-truncate, the least interspace between the eyes less than one- 

 half the greatest thickness of the eyes; eyes in general form strongly arcuate 

 around the insertion of the antennae, greatest thickness cephalad more than 

 twice the thickness ventrad; antennae elongate, setaceous; maxillary palpi of 

 the proportions given in the generic description, the third joint rod-like, the 

 fourth joint tubiform, the fifth joint expanded, the oblique truncation extend- 

 ing two-thirds of the length of the joint. Pronotum transverse subelliptical, 

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

 strongly deplanate with the lateral portions gently deflected; cephaHc margin 

 of disk arcuato-truncate, latero-cephalic angles obtusely rounded, lateral 

 margins oblique arcuato-truncate cephalad, arcuate caudad, the lateral angles 

 roundly obtuse, caudo-lateral angles broadly rounded, caudal margin truncate; 

 irregular converging oblique impressions indicated on disk. Tegmina sur- 

 passing the apex of the abdomen by nearly the greatest width of the pronotum, 

 in general form lanceolate, the greatest width contained about three and one- 

 half times in the greatest length ; costal margin appreciably arcuate proximad, 

 nearly straight distad but rounded at the apex; sutural margin straight, distad 

 rounding to the apex, which is median and hardly broad; marginal field quite 

 broad, reaching to the proximal two-fifths of the wing, anal field semiovate-pyri- 

 form, the distal portion of the anal vein strongly arcuate, joining the sutural 

 margin very slightly distad of the proximal third; costal veins numerous, 

 oblique, regular but generally bifurcating distad; rami of the discoidal vein and 

 anal vein oblique, the rami of the discoidal numerous, the majority reaching 

 the sutural margin, the ulnar vein reaching the same margin at about the 

 distal two-thirds, strongly marked intercalated false nervures present in the 

 discoidal field and connected with the main veins and rami by numerous and 

 less apparent transverse nervures, which are subobsolete distad; six to seven 

 not very clearly defined axillary veins present. Wings moderately elongate, 

 costal margin subarcuate convex in distal three-fifths, apex rotundato-rectan- 

 gulate; mediastine vein closely paralleling the costal margin, reaching to the 

 middle of the same; costal veins non-clavate, moderately numerous, the distal 

 ones ramifying; medio-discoidal and medio-ulnar areas very narrow, the latter 

 faintly the wider; ulnar vein with five rami, several of which bifurcate; axillary 

 vein with three rami; intercalated triangle very small, elongate, narrow. 

 Seventh dorsal abdominal segment with a median gland depression; supra- 

 anal plate strongly transverse, moderately tectate, distal margin broadly obtuse 

 with a short median fissure, about which the margins are recurved; genital 

 hooks consisting of a simple falciform pair, directed dorsad, and a dextral 

 unpaired larger organ having the form of a "bill-hook"; corci large, depressed, 

 monili-fusiform, dorsum deplanate, venter rounded, apex moderately acute; 



