no LE CONTE.— LONGICORN COLEOPTERA 



Georgia and Louisiana ; rare. The elytra are almost truncate at tip, with a sutural 

 spine and slight external angle.* 



ORTHOSOMA Serv. 



Mesosternum simplex. 



Antennae 11-articulatae, baud imbricatae, articulo 3'° vix longiore. 

 Palpi breves, dilatati. 

 Thorax brevis, lateribus trispinosus. 

 Tibiae compressas tenues. 



The body is elongate and cylindrical; the first joint of the antennae shorter and 

 thicker than in the preceding genera. 



1. 0. CYiiiNDRiCTJM. — Elongatum cylindricum, rufo-piceum, nitidum, thorace spinis lateralibus recte 

 prominulis, basi subrotundato, elytris punctatis obsolete costatis, antennis striatis. Long. 1-1 — 1'4. 

 Serv. An. Ent. Fr. 1, 154. 



Prionus cyUndricus, Fabr. Syst. El. 2, 261; 01. 66, 1, 6; Harris Ins. Mass. 80. 

 Ceramhyx unicohr, Drury Ins. 1, tab. 37, fig. 1. 

 Ccramhyx Inmnus, Forster Cent. Ins. 37. 

 Ceramhyx pensylvanicus, De G-eer. pi. 13, fig. 13. 

 Prionus sulcatus, Beauv. Ins. 226, pi. 35, fig. 4. 



Mas, antennis corpore brevioribus, versus basin paulo incrassatis, tborace confertim grossius punctate. 

 Femina, antennis corporis dimidium aequantibus; tborace minus dense punctulato. 

 Abundant throughout the United States. 



I found on the Colorado River an elytron, which indicates a second species of this 

 genus; it has the same relative proportions as in O. cylindricum, but the punctures 

 are less deep and more rugous ; there is no appearance of costse. 



TRICHOCNEMIS. 



Mesosternum simplex. 



Antennae filiformes, articulo 3'° longissimo, sequentibus tribus conjunctis aequali. 



Palpi breves, crassi. 



Thorax antrorsum angustatus, lateribus insequaliter multispinosus. 



Tibiae vix compressse, filiformes, anticae intus valdc pubescentes. 



Very similar to Ergates, but differs in the pubescence of the anterior tibiae. 



1. T. SPICULATUS. — Piceus, elongatus, capita profundissime canaliculato, tuberculo suboculari valde acuto, 

 thorace scabro, dorso antice bicalloso, spiculis lateralibus valde acutis, apicali basalique majoribus, 

 elytris rugose punctatis, thorace latioribus. Long. 2'15. 



* I have not seen any description of the Mexican species, and therefore add it here. 

 D. s'uLcicoRNis. — Nigro-piceus, nitidus, thorace insequaliter varioloso-punctato, basi vix rotundato, spinis lateralibus 

 longissimis, elytris obsolete costatis basi punctatis, humeris fere scabris, margine valde explanato ; palporum 

 articulo ultimo paulo dilatato; antennarum articulo 3'° supra sulcato. Long. 2-7 — 3-5. 



Mas, antennis corpore vix brevioribus articulo 3'° scabro, 4 — 11 confertim striatis. 



Femina, antennis corpore duplo brevioribus articulis 4 — 11 confuse striatis. 



Punto Nacional, Mexico. Mr. Pease. 



