108 LE CONTE.— LONGICORN COLEOPTERA 



B. Antennse 18 — 30 articulatse, thorax lateribus tridentatus. 



3. P. FissiCORNls. — Nigro-piceus, nitidus, tliorace subtiliter parce punctato, lateribus obtuse tridentato, 



elytris thorace latioribus parce grossius punctatis, obsolete costatis. Long. l-O — 1-6. 

 Hald. Pr. Ac. Nat. Sc. 3, 125. 



Mas. — Antennis crassissimis, valde imbricatis 27 — 30 articulatis articulis subtus profundissime incisis. 

 Femina, antennis tenuibus, imbricatis, 25-articulatis, articulis subtus ad apicem sinuatis. 



I found this species abundant near the Platte River, of Nebraska Territory. Lieut. 

 Haldeman collected it in Texas, and I have since received it from New Mexico. 



4. p. IMBRICORNIS. — Rufo-piceus, nitidus, thorace parce subtiliter punctulato, valde transverso, lateribus 



3-dentatis, dente postico (angulari) rectangulato, elytris tliorace vix latioribus, punctatis, antennis 



18-articulatis. Long. -85 — 1-8. 

 Oliv. 66, 13, 52; Beauvois Ins., tab. 36, fig. 2. 

 Cerambi/x imbricornis, Lin. Syst. Nat. Ed. Grmel., p. 1815. 



Mas, antennis crassis, corpore vix brevioribus valde imbricatis, articulis 3 — 17 subtus ad apicem rotundato- 

 productis. 



Femina, antennis tenuibus, corpore duplo brevioribus, leviter imbricatis. 



Southern and Western States. The elytra of the female are more convex than 

 those of the male ; they are sometimes indistinctly costate, and in such specimens the 

 punctures are much stronger. 



C. Antennse 12-articulat8e, thorax lateribus tridentatus. 



5. P. CRASSICORNIS. — Rufo-piceus, nitidus, thorace parce subtiliter punctato, valde transverso, dentibus 



2 primis acutissimis, reflexis, postico (angulari) obtuso, elytris thorace latioribus, subtiliter punctatis, 



leviter rugosis, antennis basi valde incrassatis. Long. 1'8 — 2'1. 

 Mas, antennis crassis, modice imbricatis, subtus ad apicem oblique sinuatis. 

 Femina, antennis serrato-imbricatis, basi crassioribus. 



Oregon. The gradual attenuation of the antennse from base to tip distinguish this 

 very large species ; the sutural spine of the elytra is well marked, and the breast is 

 more hairy than in the other species. 



6. P. PALPARis. — Nigro-piceus nitidus, thorace parce punctato, transverso, antrorsum subangustato, 



intermedio prominulo, elytris thorace paulo latioribus, parce punctatis, obsolete costatis. Long. 



1-1— 1-45. 

 Say J. Ac. Nat. Sc. 3, 327. 



Mas, antennis crassis, imbricatis, corpore sesqui brevioribus, articulis subtus baud sinuatis. 

 Femina, antennis corpore duplo brevioribus, tenuibus versus apicem serratis. 



Platte River, and New Mexico. The antennse of the male gradually diminish in 

 thickness from the base, but much less than in P. crassicornis ; the last joint of the 

 maxillary palpi is one-half longer than the preceding ; the posterior tibise are much 

 more bent than in the other species. 



7. p. OBLIQUICORNIS. — Rufo-piceus, nitidus, thorace parce punctulato, transverso, basi valde sinuate, dentibus 

 prominulis postico rectangulari, elytris thorace latioribus grossius punctatis, obsolete costatis. Long. 1-4. 



Mas, antennis corpore vix brevioribus crassis, imbricatis, articulis subtus oblique sinuatis. Femina latet. 



