216 OETHOPTEBA. 



Var. a. Antennae nigra?, apice flavo ( <$ ). — 5. Pronotum fulvescens vel etsi maculis nigris majoribus notatum. — 



c. Tibiae posticae flavicantes, supra fuscae. 

 $ . Elytra et alae breves vel breviter caudatae. 

 cJ . Elytra longiora ; alae breviter caudatae. 



Hab. Mexico, Dos Caminos in Guerrero, Atoyac in Vera Cruz, Teapa in Tabasco 

 (//. H. Smith). 



Var. peruviana. — Brunnea vel fusco-fulvescens, immaculata. Antennae concolores, articulis 5°-8° testaceis. 

 Caput fuscum. Pronotum fusco-fulvum (maculis nonnulis obsoletissimis brunneis, seu obsoletissime 

 brunneo-marmoratum) nonnunquam marginibus lateralibus angustissime pallidioribus. Elytra brevia, 

 fusca vel nigra, cantho dorsali et linea anali obsolete fulvo-brunneis. Pemora antica intus fulvo- 

 bilineata, intermedia obsolete fulvo 3-fasciata; tibiae saltern intus testaceo-variae. Pemora postica 

 nigra vel fusca, area supera obsolete transverse fulvo-lineolata, area externa nonnunquam lineis longi- 

 tudinalibus 1 vel 2 fulvescentibus ; lobo geniculari testaceo. Tibiae fuscae, subtus pallidiores, calcaribus 

 et metatarso flavis ; hoc fere dimidiam longitudinem calcarium aequans. Abdominis segmenta subtus 

 fusco-testaceo-limbata. Appendices anales fusci. 



Hab. Pbeu, Tarma (Mus. Genavense : 2 $ ). 



Tribus GRYLLIN^. 

 Grylliens, Saussure, Mel. Orth. 5 e fasc. p. 226 ; Miss. Scient. Mex., Orthopt. p. 379. 



In this and the following tribes the neuration of the elytra of the males affords 

 important characters for the separation of the genera and species, in most of which 

 nearly the whole organ is modified in a very extraordinary way, to form a musical 

 instrument. It is thus necessary to make perfectly clear the nomenclature of the 

 nervures of the elytra (vide Tab. XIII.*). 



In all the Gryllidse, except the Tridactylinse, the elytra are divided into two fields : 

 the lateral and the dorsal. The latter is formed by the discoidal and the anal fields 

 being united into one, and lying flat on the back of the insect. The two parts of the 

 elytra are separated by a more or less sharp ridge formed by the two principal veins. 

 The first part is formed by the humeral vein (vena humeralis) ; but this deflexes laterally 

 at its middle, and it is the discoidal vein (v. diseoidalis) which continues the ridge in 

 its second part. The medial vein (v. media), nearly contiguous to the discoidal vein, 

 rests on the back and belongs only to the dorsal field. 



The lateral field contains: — <z, the mediastinal vein, parallel to the ridge of the 

 elytron ; it is simple or (more generally) ramose ; — b, 3-4 free veins, quite at its base, 

 generally short (except in the Trigonidinse). 



* Explanation of the neuration of the elytra of the males when provided with a drum (vide Tab. XIII. 

 figg. 9, 21, 22, 23): — h, vena humeralis. — d, r. diseoidalis. — m, v. media. — a, v. analis. — A. v. stridulans 

 (scil. pars stridulans venae analis). — a', v. postanalis (continuatio venae analis). — x, oti ', x" , venae axillares. — 

 z, z, z", v. postaxillares (continuatio venarum axillarium). — n, nodus analis vel musicus. — 6, 6', v. diagonalis 

 (ulnaris). — Z, stigma. — s, speculum. — i, v. involvens. — r, area apicalis. — v, v', venae obliquae et venae transversae. — 

 N.B. Pig. 9, the punctured line of the posterior z reaches too far. 



