AMERICAN COLEOPTERA. 115 



Notes on some genera of CER AilIBYCID JG with descrip* 

 tions of new species. 



BY GEORGE H. HORN, M. D. 



The following pages contain the results of a study of several parts 

 of the Cerambycide series which have been at all times trouble- 

 some, more from the scattered and inadequate descriptions than 

 from the number of the species. In the first few pages the tribe 

 Acanthoderini as defined by Dr. Leconte, (Classif. p. 33G), is con- 

 sidered in a synoptic manner with tables of the genera and species 

 with descriptions of those only which are believed to be new, the 

 tables being full enough to enable the others to be readily dis- 

 tinguished. Following this part are several isolated genera with 

 descriptions of new species. 



The tribe Acanthoderini is divided into two sub-tribes in the 



following manner : 



Scape of antennse clavate ACAXTHODERIXL 



Scape of antennae nearly cylindrical ACANTHOCINI]!^!. 



Sub-tribe I. — Acanthoderini. 



Scape of antennae short, clavate, the entire member not longer 

 or very little than the body and not diff"ering notably in the sexes, 

 fringed beneath. Anterior tarsi of % broader than in the $ , fringed 

 at the sides with moderately long hair. 



After a careful examination of our species I see no reason for 

 difi"ering from the view expressed by Dr. Leconte, (Classif p. 337), 

 that they constitute but one genus. It is true that quadrigibha has 

 subcostate elytra so that the sutural region appears broadly grooved 

 and the tarsi are more dilated than the other species, but these char- 

 acters seem hardly to have generic value. Lacordaire has placed this 

 ill the genus Psapharochrus Thorns., to which he has also erroneously 

 added decipiens. Our species are all considered to belong to 



ACANTHODERES Serv. 



Four species occur in our fauna which are known by the following 

 differences : 



Sutural region of elytra vaguely grooved, the groove limited on each elytron 

 by a feeble costa. 

 Elytra with moderately broad transverse band of white in front of middle 

 broadly interrupted at the suture quadrigibba Say. 



