OF AMERICA NORTH OF MEXICO. 



143 



XIV. 



Ace tabula antica Integra, angulata. 



Femora non clavata. 



Pedes antici elougati. 



Thorax spina articulata armatus. 



Acrocinus, Macropus. 



XV. 



Humeri nulli. 



Acetabula antica Integra. 



Elytra connata. 



Monilema, Ipochus, (n. g.) Cyrtinus, (n. g.) Dor- 

 cadion, Dorcadida, CoUapteryx, Phrissoma, Gersegi- 

 dion, Parmena, Microtragus, Xylolotes. 



XVI. 



Acetabula antica integra, rotundata. 

 Tibiae anticae apice subcalcaratae. 

 Antennse articulo 1""" elongato. 

 Frons saepissime brevis, inter antennas concava. 

 -ffidilis, Grraphisurus, Eutrypanus, Liopus, Leptos- 

 tylus, (n. g.) Colobothea, Trypanidius. 



XVII. 



Acetabula antica integra, rotundata. 

 Antennae articulo l"""- clavato. 

 Tibiae anticae apice bicalcaratae. 

 Frons elongata, plana. 



Acanthoderes, Steirastoma, Tragomorphus, Trigo- 

 nopeplus, Scleronotus; 



Group 1. 



Contains narrow cylindrical species, with very small and imperfect oral organs, 

 and weak short legs ; the tarsi are less dilated than in the following groups. The 

 thorax is unarmed ; the front short and perpendicular, the labrum invisible, and the 

 antenuEe only lO-jointed, long and hairy. The anterior acetabula are membranous 

 posteriorly, which distinguishes this group from all others, except the second. 



They are evidently the most imperfectly organized of this division, and seem to 

 approach, by the form of the head, and by their abbreviate elytra, the Necydalis 

 group of the Lepturse. 



DYSPHAGA. 



Tessaropa Hald. 

 Antennae articulo 1"° reliquis breviore, 2°'*° obsoleto. 

 Oculi divisi. 

 Acetabula antica extus angulata, postice hientia. 



The elytra in this genus are short, and the wings extend beyond the tip of the 

 abdomen. The intermediate tibise have no external prominence, but the anterior 

 ones have the slight internal oblique impression which distinguishes all the members 

 of this division. 



Mr. Haldeman's name is pre-occupied by Tessarops among Arachnida. 



1. D. TENUiPES, atra parce cinereo-pubeseens, capita canaliculato, punctato, thorace elongato, punctis ocellatis 

 minus profundis scabro, elytris scabris, basi testaceis, abdomine duplo brevioribus, pedibus fuscis. 

 Long. -25. 

 Molorchus tenuipes Hald. Proc. Ac. Nat. Sc. 3, 126. 

 Tessaropa ienui'pes Hald. Proc. Am. Phil. Soc. 4, 374. 



Pennsylvania, Haldeman. The larva lives in small twigs of Carya. 



