252 OETHOPTEEA. 



elongated. Both sexes completely winged. The ovipositor of the females straight, 

 obtuse and indented at the tip. The elytra of the males elongated, but rounded at 

 their extremity, completely occupied by the tambourine, hyaline ; the diagonal vein 

 straight from the anal knot up to the stigma ; the speculum elongate, asymmetric, 

 divided by a straight vein parallel to its anterior-internal margin, the apical margin 

 more curved than a half-circle ; the post-anal and post-axillar veins nearly straight, the 

 first post-axillar vein hooked at its extremity, so as to anastomose with the second, 

 and sending 2-3 small branches to this vein ; the oblique veins 3 or 2 + 2, obliquely 

 transverse, the last one arcuate. The membrane of the elytra forming delicate 

 sinuous folds. 



(ECANTHUS, Serville. 



(Ecanthus, Serville, Rev. Meth. p. 38 (1831) ; — Brulle ; — L. H.Fischer; — Scudderj — de Saussure; 

 — Bnmner v. W. 



(Ecanthus is sufficiently distinguished by its facies (see Saussure, Melang. Orthopt. 

 5 e fasc. t. 15. fig. xxxiv. 2 , and 6 e fasc. t. 16. fig. xliii. 6 ). Most of the species 

 resemble each other very closely, and some of them cannot be separated with certainty. 



Synopsis specierum. 



I. 



a. Pronotura ad marginem posticum per sulcum transversalem nullum divisum, tantum sulco 

 obsoleto notatum; ejus discus scutello postice rotundato, antice obsoleto notatus. Lobi 

 laterales pronoti margine infero subrecto. Elytra immaculata. Alae brevius caudatae. 

 b. Antennarum articuli 1, 2 subtus tuberculo obsoleto, nigro-punctato. Pronotum brevi- 

 usculum. — 1. niveus, de G. 

 bb. Antennarum articuli 1, 2 subtus haud tuberculati. 



c. Antennae luteae, corpori concolores. Scutellum pronoti sulco divisum. 



d. Articulus primus antennarum subtus vitta et macula nigris, secundus macula nigra. 



Pronotum breve, planulum. — 2. argentinus, Sss. 

 dd. Antennarum articuli 1, 2 lineola subtili nigra. 



e. Gracillimus; pronoto longiusculo, gracili. Alae caudatae. — 5. varicornis, Walk. 



ee. Crassiusculus ; pronoto breviusculo. Alae quam elytra breviores. — [4. linto- 



latus, sp. n. (Brazil).] 



cc. Antennae nigrae vel rufidae, articulis 1, 2 runs, margine interno subtus fusco. Scutellum 



pronoti postice in medio sulcis 2 brevibus distinctissimis impressum. — 3. nigri- 



cornis, Walk. 



aa, Pronotum elongatum, antice angustum, postice per sulcum profundum transversum suturalem 



divisum. Litura marginis postici et marginis antici crasse punctata. Antennarum articuli 



1-2 subtus apice tuberculati. Loborum lateralium margo inferus subsinuatus, pone medium 



lobatus. Alae longe caudatae. Elytra punctis 1 vel 2 fuscis notata. — 6, bipunctatus, de G. 



