212 ORTHOPTEEA. 



sulfurea. Elytra margine suturali a medio et apicali sulfureo. Alae longe caudatae, ad sulcum transversum 

 campi opaci vitta vel macula trigonali sulfurea in margine postico (supero) anguste producta. Tibiae 

 posticse fuscse, subtus flavescentes ; calcaribus et metatarso flavis ; hoc crassiusculo, § calcarium longitudine 

 sequante. Cerci (c) et appendices anales (a) graciles, breviusculi ; bis haud dilatatis, apice flavo, longe 

 setosis. Lamina infra-genitalis ($>i) parabolica, apice bi-impressa (ab infero fere ut tridentulata). 

 Segmentum dorsale 8 m trapezinum, convexiusculum, sulco-divisum, margine postico in medio subtiliter, in 

 lateribus latius, flavo. Segmentum 9 m latum, quando erectum angulis lateralibus (a latere) acutissimis, 

 anguste dentiformibus, margine postico transverso, recto latissimo, a supero arcuato, anguste flavo, 

 angulis tamen nigris. Segmentum 10 m utrinque taeniam transversam, per lineam longitudinalem divisam 

 ac transverse pectinatim strigatam obferens ; ejus pars media (vs) seu lamina supra-analis angusta, 

 plicata, canaliculata. 



Var. Pronotum maculis 2 luteis nullis. [Guiana.] 



3 . Long. corp. 8*7, cum alis 13 millim. 



Hah. South America, Guiana and Venezuela (Mus. Genavense).~\ 



[5. Ehipipteryx rivularia, sp. n. (Tab. XI. fig. 20.) 



c? . Quam R. mexicana major. Nigra, vel fuscescens. Antennae sicut in speciebus vicinis coloratae. Orbitae 

 anguste, pronotum circumcirca, sulfureo-marginata ; hoc in disco utrinque vitta obliqua transversa 

 sulfurea. Elytra margine costali subtiliter, apice latiuscule luteo-limbata, nee non linea longitudinal! 

 discoidali in tota longitudine extensa, cum margine apicali continua, lutea. Alae longissime caudatae, 

 apicem tibiarum posticarum fere attingentes, cantho dorsali et apice anguste luteo-limbatis, nee non sulco 

 transverso luteo. Eemora 1, 2 supra et subtus tibiaeque intermediae supra sulfureo-limbata. Femora 

 postica fuscescentes, margine supero ac infero luteo-limbato, nee non extus linea longitudinali flavida ; 

 conchis basi, lobo geniculari apice, flavido-marginatis. Tibiae flavidae, supra brunnescentes, calcaribus et 

 metatarso sulfureis ; hoc crassiusculo, quam calcaria paulo breviore. Abdominis segmenta subtus late flavo- 

 limbata. Segmenta dorsalia prima 5 transversa ; 6 m et 7 m recondita ; 8 m (fig.) suberectum, pentagonale 

 (vel si mavis hexagonale), convexum, subconchoideum, sulco divisum, angulis lateralibus prominulis; 

 margine postico luteo, angulis dentiformiter productis. Segmentum 9 m magnum, erectum, arcuatum, a 

 supero in medio absconditum, lateraliter utrinque dentiformiter prominens, rufo-testaceum. Lamina 

 supra-analis tripartita ; pars intermedia minuta, supera, subrotundata ; partes laterales ramos 2 elongatos 

 deplanatos angustos (u) arcuatos, supra sulcatos, ad inferum curvatos, efficiens ; (binos forcipem formantes). 

 Cerci (c) et appendices anales (a) sat minuti, crassiusculi, acuminati, nigri ; his secundo articulo ovato. 

 Lamina infra-genitalis subparabolica apice subtrilobata. 



■S . Long. corp. 5-8, cum alis 10 millim. 



Explanation of fig. 20. — The 8th and 9th dorsal segments of the abdomen are reflexed upwards, as in the 9th 

 segment of B. cyanipennis (Tab. XI. fig. 22). The 8th segment is broadly trapezoidal, with a wide notch 

 placed between two acute little lobes. The 9th segment (9) is corneous, opened, and raised, shell-like. 

 In the middle under its margin appears the small supra-anal plate, which projects beneath two long 

 processes (u), both being flattened and sulcate, curved downwards at the tip. The cerci (c) and anal 

 appendages (a) are short, and when seen from above appear to be conic ; the anal appendages when seen 

 from the side are more rounded ; the infra-genital plate (i) is parabolic and somewhat trilobed at 

 the tip. 



Hah. Colombia (Mus. Genavense) : probably extending to the Isthmus of Panama. 



Closely resembling R. cyanipennis in coloration, but smaller and well distinguished 

 by the form of the supra-anal forceps.] 



6. Ehipipteryx limbata, Burm. 



Xya limbata, Burm. Handb. d. Ent. ii. p. 742. 5 (1839). 



Rhipipteryx limbatus, Walk. Cat. Brit. Mus. Dermapt. Salt. etc. i. p. 8. 3. 



