396 OETHOPTERA. 



This genus includes a large number of species, spread over the whole world. It is 

 probable that many of the South-American forms will eventually be found in Central 

 America. 



The tympanum is membranaceous in both elytra in the males, and peculiarly formed ; 

 its second transverse vein, instead of being parallel to the stridulating vein, is oblique 

 and divides the speculum into two triangular cells. 



Synopsis specierum. 



1. Elytra perfecte explicata, abdomen superantia, alis semper breviora. Statura majore. Ovi- 



positor brevis, falcatus. Lamina infra- genitalis $ excisa. Prosternura bispinosum. Tibiae 

 anticse spinis 6 : 7 armatae. 

 2. Femora postica subtus inermia. Tibiae 4 anticae concolores, haud fusco-nigrae ; frons 

 pallida, immaculata. — Orchelimum, Serv. 

 3. Elytra femora postica haud vel parum superantia. Statura crassiore. 



4. Statura minor. Elytra alis subaequilonga. — [1. agile, de Geer.] 

 4, 4. Statura major ; elytra alis distincte brevior. — [2. glaberrimum, Burm.] 

 3,3. Elytra femora postica valde superantia. Statura gracilior. — [3. iner me, Redt.] 



2, 2. Femora postica subtus spinosa (tantum extus spinulosa) . 



5. Tibiae omnes superne nigrae vel infuscatae. — [4. nigripes, Scudd.] 

 5 , 5. Tibiae omnes superne fusco-nigrae. 



6. Elytra apicem femorum posticorum haud attingentes, quam alae parum 

 breviora. — [5. cuticulare, Serv.] 

 6, 6. Elytra apicem femorum distincte superantia, quam alae distincte breviora ; 

 pronotum concolor. — [6. nitidum, Redt.] 

 1, 1. Statura minor, gracilior. Ovipositor rectus vel parum incurvus ; statura minor, gracilior. 

 Prosternum bispinosum. — Xiphidium, Serv. 

 2. Elytra abdomen superantia, quam alae breviora. Lobi laterales pronoti margine postico 

 recto. Cerci $ crassi, obtusi, apicem versus depressi ; lamina infra-genitalis apice 

 haud bidentata ; styli filiformes. 

 3. Femora postica subtus spinula unica vel nulla. 

 4. Lobi geniculares postici bidentuli. 



5. Verticis rostrum leviter ascendens, facie apicali elongato-trigonali, in piano 

 frontis jacens. Ovipositor quam femora postica brevior. — 7. fasciatum, 

 deG. 

 5, 5. Verticis rostrum fortiter ascendens, facie apicali angustiore, cuneiformi, oblique 

 supera. — 8. resinum, sp. n. 

 4, 4. Lobi geniculares postici unidentati. — 9. unispina, sp. n. 

 3, 3. Femora postica subtus spinulis compluribus instructa ; abdomen concolor. — 10. salta- 

 tor, Sss. 

 2, 2. Elytra abbreviata ; abdomen superantia, quam alas longiora. 



3. Ovipositor longissimus. (Elytra vix pronoti longitudine.) Verticis rostrum latum. 

 Lamina infra-genitalis $ apice truncata. — [11. strictum, Scudd.] 



