OF AMERICA NORTH OF MEXICO. 147 



Middle and Southern States; very rare. For my specimen I am indebted to the 

 Rev. Dr. Zieffler. 



D 



DORCASCHEMA iDej. Hald. 



Antennae non pilosse, articulo 3'° longiore. 

 Elytra apice rotundata. 

 Femora paulo clavata. 



In the males the femora are very much compressed, and the anterior femora and 

 tibiae much bent. 



1. D. ALTERNATUM, testaccum, breviter cinereo-fulvoque pubescens, capite thoraceque linea laterali fulva, 



elytris utrinque maculis fulvis irregularibus fere in vittis tribus ordinatis, grosse punctatis. Long. -48. 



Mas elytris a humeris postice angustatis. 

 Femina elytris postice perparum dilatatis. 

 Hald. .54. 

 Snj^erda alternata Say. J. Ac. 3, 405. 



Pennsylvania and S. Carolina. Dr. Zimmerman. I am inclined to believe that 

 Saperda maculata Oliv. 6S, 3, 33, is an excessively bad representation of this species. 



2. D. NIGRUM, opacum, scabrum, nigrum, vix subtilissime pubescens, elytris grosse punctatis. Long. '35. 

 Femina elytris a humeris postice dilatis, antennis corpora sesqui longioribus. 



Hald. 54. 



Saperda nigra Say. J. Ac. 5, 272. 



Southern States ; very rare. 



Group 5. 



These differ from the preceding in having the thorax armed with an acute lateral 

 spine. The body is long and subcylindrical, the front is deeply channeled, and the 

 antennae are approximate at base, setaceous, elongate in the males and never pilose : 

 their first joint is thick and clavate. The legs are moderately long, the anterior ones 

 much lengthened in the males : the femora never clavate. The ligula is deeply 

 emarginate : the mentum is trapezoidal, and membranous at the apex. The anterior 

 acetabula are a little incomplete posteriorly, but not widely gaping as in the two first 

 groups : several species heretofore called Monohammus will be found in group 6. 



MONOHAMMUS Serv. 



MonocJiaimis Kirby. 



Corpus alatum. 



Os productum, palpis articulo ultimo fere acuto. 



Tibiae anticae curvatae. 



