AMERICAN COLEOPTERA. 211 • 



behind the mentum, there is on each side a longitudinal ridge below 

 the eye. connected with the side margin of the head, and leaving a 

 concavity of triangular form in front of the eye; there is besides an 

 acute short transverse ridge behind the eye, forming another deep 

 concavity. The gular sutures are obsolete, but the traces remaining 

 diverge strongly behind; the hind part of the neck is marked by two 

 transverse impressed lines. Labrum depressed between the mandibles, 

 elongate-triangular, somewhat emarginate, hairy at the sides and tip, 

 shining, sparsely coarsely punctured and hairy. 



Prothorax truncate before and behind, elongate-ovate, about one- 

 third longer than wide, widest behind the middle, more nar- 

 rowed before than behind; sides distinctly and acutely margined; 

 apex with a marginal line, and a short additional one at the angle; 

 base declivous, feebly margined ; under surface with a distinct im- 

 pressed marginal line, representing the suture between the pronotum 

 and the side pieces; there is, .however, no suture between the epimera 

 and episterna; the former pass behind the front coxae, and unite with 

 the posterior extremity of the presternum which is narrow, compressed, 

 and perpendicular at tip. In front of the coxas the prosternum is 

 wide, the sutures are straight, and run from the outer side of the coxae 

 to the front angles of the pronotum, and there is a narrow triangular 

 excavation on the episterna at that place. The front margin of the 

 prosternum is thick, hairy on the interior edge, deeply emarginate, and 

 armed each side with about six obtuse serrations. 'I'he space between 

 the coxge is concave, and the coxal cavities are rounded, but conspicu- 

 ously angulateJ on the outer side, with a large trochantin. 



Mesosternum long, extending between the middle coxae; episterna 

 separated by a very fine longitudinal suture, which is almost effaced as 

 it approaches the coxal cavity ; epimera oblique, transverse, not nar- 

 rowed inwards^ and attaining the coxal cavities, of which they form 

 the outer margin; cavities rounded, with an outward prolongation, in 

 which no trochantin is visible. 



Metasternum very large; episterna narrow; epimera slightly visible 

 at the outer side of the hind coxte; hind margin broadly but not 

 deeply emarginate each side, broadly subtruncate between the coxte, 

 with a small deflesed medial angle; in front of each coxa is a 

 lunate impression. 



Abdonjen conical, small for the bulk of the insect; of five seg- 

 ments, having the posterior margins straight and prominent. The 

 first is equal in lengtb to the others united, but is excavated almost 

 to the hind margin for the reception of the immense hind coxse; the 



