598 TRANSACTIONS OF THE 



tions placed longitudinally, a more obvious one on the lateral 

 margin, and another each side of the basal middle ; elevated line 

 of the posterior angles less than one-fourth of the length of the 

 lateral edge, but slightly elevated and obtuse : elytra depressed 

 from the suture to the middle ; tip denticulated. 



Length nearly one-fifth of an inch. 



Resembles geminatus, but its form is rather more slender, the 

 frontal punctures are obsolete, and the elevated line of the thora- 

 cic angles is much shorter and less distinct. 



12. A. COGITANS "Weber. — The thorax is described to be 

 serrate ; but on close examination the edge will be found to be 

 entire, and the upper surface of the edge, or extreme margin 

 onl}', is serrate. The body is more dilated than in any other of 

 our species. 



[Belongs to Rhsehoscelis Chevr. and was also described as B. 

 ignara Fabr. — Leg.] 



TRACHYS F. 



1. T. TESSELLATA F. 



2. T. OVATA Weber, Obs. p. 76. 



Our species vary greatly or are very numerous. 

 [These species belong to Brachys. — Leg.] 



METONIUS Say. 



Thorax short, wide, and deeply emarginate before for the re- 

 ception of the head ; not lobate behind : antennae subclavate, 

 concealed when at rest in a groove of the thorax ; body short, 

 wide before and narrow behind : tibiae angulated, and when at 

 rest the tarsi are applied to the outer edge : pi'aesternum promi- 

 nent to the mouth, and behind applied evenly to the poststernum 

 by a transverse line. 



This genus difiers from Tracliijs in the thorax being not lobed 

 behind ; in the prsesternum terminating by a straight line ; by 

 the dilatation of the tibiae, &c. 



[This genus is the same as the subsequently described Pachys- 

 cclis Solier, which is united with Brachys by Lacordaire. — Leg.] 



1. M. OVATUS nob. (Trachys) Ann. Lye. New York. — Those 

 who will retain this species in Trachys must change the name to 

 Iseoigatus, as the other is preoccupied in that genus. 



[Vol. VI, 



