164 DESCRIPTIONS OF AND OBSERVATIONS ON 



found or well defined ; beneath the middle of the front with short 

 whitish hairs : thorax with two slight indentations placed longitudi- 

 nally, 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 ob- 

 tuse : 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 fron- 

 tal punctures are obsolete, and the elevated line of the thoracic 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 only, is serrate. The 

 body is more dilated than in any other of our species. 



TRACHYS, F. 



1. T. tessellata, F. 



2. T. ot)«^a, Weber, Obs. p. 76. 



Our species vary greatly, or are very numerous. 



GENUS METONIUS, Say. 



Thorax short, wide, and deeply emarginate before for the reception 

 of the head ; not lobate behind : antennae subclavate, concealed when at 

 rest in a groove of the thorax ; body short, wide before and narrow be- 

 hind : tibiae angulated, and when at rest the tarsi are applied to the 

 outer edge : praesternum prominent to the mouth, and behind applied 

 evenly to the poststernum by a transverse line. 



This genus differs from Trachys in the thorax being not lobed be- 

 hind ; in the praesternum terminating by a straight line ; by the dilata- 

 tion of the tibiae, &c. 



1. M. ot'a/ws, Nob. (Trachys) Ann. Lye. New York. Those who 

 will retain this species in Trachys must change the name to Ixvigatus, 

 as the other is preoccupied in that genus. 



2. M, purpureus. Ovate, black; elytra purple. — Inhab. Indiana. 

 Body black : head with distinct punctures ; front with an indented, 



