OF AMERICA NORTH OF MEXICO. 175 



of this species, which is much less elongate than the others. Should Eutrypanus 

 triangulifer Erichson (Wieg. Arch. 1847) enter this genus, the present name must 

 be changed. 



2. G. FASCiATUS, fulvo-cinereo dense pubescens, breviter parce nigro-pilosus, thorace fusco -variegato, et 



bivittato, elytris parce punctatis, fusco nebulosis, nebulis in fasciisS veI4 obliquisconfluentibuSjantennis 

 pedibusque nigro-annulatis. Long. -58. 

 Ceramhi/x fasciatus De Geer. 5, 114, pi. 14, 7. 



Middle and Southern States. 



3. G-. PUSiLLUS, dense cinereo-pubescens, parce breviter nigro pilosus, fusco punctatus et nebulosus, elytris 



parce punctatis, maculis fuscis in fasciis duabus obliquis coeuntibus, posteriore distincta undulata, antennis 



pedibusque nigro-annulatis. Long. -41. 

 Kirby Fauna. Bor. Am. 4, 167. 

 JEdiUs despectus Lee. Agassiz, Lake Superior, 234. 



Found in every part of the United States ; some of the varieties of the preceding 

 species resemble this very closely, but there is a real difference in the spine of the 

 thorax which serve to distinguish them. In G. pusillus the spine is less prominent 

 and more obtuse, so that its posterior margin is straight and oblique. In G. fasciatus 

 the same margin is concave; in the latter species the elytra are commonly emarginate 

 and almost bidentate at tip, but this is not constant. 



Group 17. 



This group approaches very near to 13, and is only distinguished by the round 

 anterior acetabula. The body is short and stout, commonly narrowed behind and 

 depressed. The head is always much narrower than the thorax, which is strongly 

 armed in the middle of the sides, and tuberculate on the disc. The mentum is very 

 short and deflexed. The front is large and fiat, not concave between the antennae, 

 which are widely separated. The femora are always clavate, and the tibiae are armed 

 with very distinct terminal spurs. 



ACANTHODERES Serv. 



Labrum valde porrectum mandibulae pyramidatas vix curvatee. 

 Antennte parce pilosaj, articulo 1""^ clavato. 

 Thorax lateribus acute spinosus, disco bituberculato. 

 Femora valde clavata. 



The elytra are truncate at tip, and sometimes almost dentate ; the anterior tarsi of 

 the males are margined with long hairs. 



1. A. QUADRIGIBBUS, fusco pubescens, thorace medio elevato, elytris obsolete bicostatis, costa interiore basi 

 elevata, parce punctatis, obscuro cinereoque nebulosis, macula alba transversa angulata laterali ante 

 medium ornatis, antennis annulatis. Long. -41 — -57. 



Hald. 45. 



Acanthocinus quadrigibhus Say. Best. Joum. Nat. Hist. 1, 195. 



