OF AMERICA NORTH OF MEXICO. 323 



5. A. STRiGiLATUs. — Niger parcius pubescens, capite valde punctato, thorace minus dense pimctato, antlce 



angustato, utrinque constricto, convexo, vix canaliculato, elytris densius punctatis, testaceis, vitta 



humerali, apiceque truncata nigricantibus. Long. '3. 

 Lee. Ag. Exp. 

 Leptura strigilata, Fabr. El. 

 L. semimarginata, Rand. B. J. 2, 20. 



Maine and Lake Superior. Varies with the elytra entirely fuscous. 



6. A. DiscoiDEus. — Niger, opacus, parce pubescens, capite linea frontali loevi, tiiorace parcius punctato, 



antrorsum angustato, apice constricto, disco triangulariter valde depresso, ante basin utrinque 

 tuberculatim prominulo, elytris sat grosse punctatis, apice truncatis, sutura margineque toto aurantiacis. 

 Long. -3. 



Lee. Agassiz Exp. 



Pachyta discoidea, Hald. 60. 



Lake Superior, Massachusetts, and Pennsylvania, 



7. A. PROTEUS. — Niger pubescens, thorace punctato, antrorsum angustato, apice constricto, disco triangulariter 



modice depresso, canaliculato, ante basin utrinque prominulo, elytris punctatis, postice paulo angustatis, 

 apice truncatis, rufis, vel nigris, vel sutura vittisque lata fuscescentibus. Long. -i. 



Lee. Agass. Exp. 



Leptura Proteus, Kb. N. Z. 186. 



Pachyta sublineata, Hald. 60. 



Lake Superior and Pennsylvania. The feet vary from black to rufous, the base 

 of the femora is always rufous. 



§3. Corpus crassum, elytris parallelis, ore non attenuato. 



8. A. ATER. — Violaceo-niger, capite thoraceque dense punctatis, hoc antrorsum angustato lateribus medio 



obtuse angulatis, elytris grossius punctatis. Long. -35. 



Oregon. Mr. Wilcox. Differs from the following in the thorax which is not at 

 all constricted or channeled. 



9. A. NiGRiPENNis. — Flavo-testaceus vix pubescens, capite fusco, thorace convexo, disco parce punctato 



antrorsum angustato, profundius constricto, basi modice constricto, lateribus subangulato, elytris 

 punctatis, nigris. Long. •4. 



Missouri. Dr. Engleman. Body short and thick, testaceous, scarcely pubescent, 

 head densely punctured, fuscous, mouth pale, antennse half as long as the body, 

 fourth joint a little shorter than the fifth, first joint pale. Thorax shining, with a 

 few scattered punctures , transverse, narrowed and deeply constricted in front, 

 posterior constriction fainter, sides obtusely angulated. Elytra twice as wide as the 

 taorax, scarcely twice as long as wide ; punctures less deep than in the following 

 species, a little smaller towards the apex, which is rounded. 



82 



